Performance information

• A review of theoretical salt weathering studies for stone heritage　　　　　　　　　　　　　　　
  Chiaki T. Oguchi; Swe Yu
  Progress in Earth and Planetary Science, Volume：8, Number：1, Dec. 2021, [Reviewed], [Lead]
  Salt weathering can cause substantial deterioration of natural rocks, building stones, masonry materials, monuments, and engineering structures. Nearly two centuries of salt weathering studies, both theoretically and empirically, have manifested its power as well as its complexity. This paper attempts to unite the kinds of literature assess the various theories in the light of the combined information. The theoretical approaches concerning the most cited mechanisms of salt weathering such as crystallization, hydration and thermal expansion of crystalline salts are thoroughly reviewed. It is understood that there is no universally acceptable hard and sound theoretical information on this topic yet. More precise theories should be developed to elucidate the complications of the mechanisms of salt weathering as well as to interpret the results of empirical studies. [Figure not available: see fulltext.]
  Springer Science and Business Media Deutschland GmbH, English
  DOI：https://doi.org/10.1186/s40645-021-00414-x
  DOI ID：10.1186/s40645-021-00414-x, ISSN：2197-4284, SCOPUS ID：85105594684
• Taya Caves, a Buddhist marvel hidden in underground Japan: stone properties, deterioration, and environmental setting
  Luigi Germinario; Chiaki T. Oguchi; Yasuhiko Tamura; Sohyun Ahn; Momoko Ogawa
  Heritage Science, Volume：8, Number：1, Dec. 2020, [Reviewed]
  Springer Science and Business Media LLC, English, Scientific journal
  DOI：https://doi.org/10.1186/s40494-020-00433-9
  DOI ID：10.1186/s40494-020-00433-9, eISSN：2050-7445
• Prior assessment of the linkage of biological cover, surface strength, and exfoliation: A case of the first gallery in angkor wat temple, Cambodia　　　　　　　　　　　　　　　
  Wonsuh Song; Tetsuya Waragai; Chiaki T. Oguchi; Tsuyoshi Hattanji
  Chikei/Transactions, Japanese Geomorphological Union, Volume：40, Number：4, First page：309, Last page：323, Oct. 2019, [Reviewed]
  Rock surface strength in relation to surface biological covers was examined on outer walls of the first gallery in Angkor Wat temple. The surface covering condition on the outer walls was categorized into three areas: 1) covered area; 2) uncovered area; 3) exfoliated area. Both initial and mean rebound values of Schmidt hammer on covered area were lower than those on uncovered and exfoliated areas. SEM observation of the rock fragment showed that the black cover on the outer walls is biofilms composed of filamentous materials. Cracks extending beneath some black biofilms are the cause of exfoliation. These results indicate that weathering processes occur beneath the biofilms, and bioprotection is not likely to work on the outer walls of the first gallery in the temple.
  Scientific journal
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85077004902&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85077004902&origin=inward
  ISSN：0389-1755, SCOPUS ID：85077004902
• In-situ oxidation effect on pore size distribution in investigating adsorption properties under various geochemical conditions　　　　　　　　　　　　　　　
  Mohammad Rajib; Chiaki T. Oguchi; S. M. Mahmudul Hasan
  Solid Earth Sciences, Volume：4, Number：3, First page：113, Last page：124, Sep. 2019, [Reviewed]
  Elsevier BV, Scientific journal
  DOI：https://doi.org/10.1016/j.sesci.2019.06.003
  DOI ID：10.1016/j.sesci.2019.06.003, ISSN：2451-912X, SCOPUS ID：85084460235
• Introduction to the Special Issue "Rock Weathering from Nanoscale to Global Scale: 2. Macroscopic Weathering and Applied Studies"
  MATSUOKA,Norikazu; OGUCHI,Chiaki T; FUKUSHI,Keisuke; MATSUSHI,Yuki; YOKOYAMA,Tadashi
  Journal of Geography (Chigaku Zasshi), Volume：126, Number：4, First page：409, Last page：411, Oct. 2017
  Tokyo Geographical Society, Japanese, Scientific journal
  DOI：https://doi.org/10.5026/jgeography.126.409
  DOI ID：10.5026/jgeography.126.409, ISSN：1884-0884, eISSN：1884-0884
• Overview of the Special Issue "Rock Weathering from Nanoscale to Global Scale: 2. Macroscopic Weathering and Applied Studies"　　　　　　　　　　　　　　　
  Matsuoka Norikazu; Oguchi Chiaki T; Fukushi Keisuke; Matsushi Yuki; Yokoyama Tadashi
  JOURNAL OF GEOGRAPHY-CHIGAKU ZASSHI, Volume：126, Number：4, First page：407, Last page：408, Oct. 2017, [Reviewed]
  Tokyo Geographical Society, Japanese, Scientific journal
  DOI：https://doi.org/10.5026/jgeography.126.407
  DOI ID：10.5026/jgeography.126.407, ISSN：0022-135X, CiNii Articles ID：130006105208, Web of Science ID：WOS:000418721900001
• Rates of Weathering Layer Development : A Review of Studies on Weathering Rind, Weathering Crust, and Rock Varnish　　　　　　　　　　　　　　　
  小口 千明
  Volume：126, Number：4, First page：473, Last page：485, Aug. 2017, [Reviewed], [Lead]
  Japanese
  DOI：https://doi.org/10.5026/jgeography.126.473
  DOI ID：10.5026/jgeography.126.473, ISSN：0022-135X, CiNii Articles ID：40021318548, CiNii Books ID：AN00322536
• Introduction to the Special Issue "Rock Weathering from Nanoscale to Global Scale: 2. Macroscopic Weathering and Applied Studies"　　　　　　　　　　　　　　　
  MATSUOKA Norikazu; OGUCHI Chiaki T; FUKUSHI Keisuke; MATSUSHI Yuki; YOKOYAMA Tadashi
  J. Geogr., Volume：126, Number：4, First page：409, Last page：411, Aug. 2017
  Tokyo Geographical Society, Japanese
  ISSN：0022-135X, CiNii Articles ID：130006105209
• Environmental Factors of Seasonal Changes in Salt Efflorescence Observed on Building Stones Used at Orval Abbey, Southern Belgium　　　　　　　　　　　　　　　
  OSAWA Yuko; OGUCHI Chiaki T.; THOMACHOT-SCHNEIDER Céline; GOMMEAUX Maxime; EYSSAUTIER Stéphanie; FRONTEAU Gilles
  Journal of Geography (Chigaku Zasshi), Volume：126, Number：4, First page：439, Last page：453, Jun. 2017, [Reviewed]
  

   Environmental monitoring and rock-property investigations are performed to explain the mechanism of deterioration observed at two buildings constructed in the medieval age and the modern age at Orval Abbey (Belgium). The medieval building is composed of two limestones, while the modern building is composed of reconstituted stone agglutinated using cement containing crushed natural limestones. Deterioration due to salt efflorescence is observed only at the ground floor wall of the modern building. Four measuring sites are set up at these buildings to monitor air temperature and relative humidity. Moisture content and Equotip hardness are measured on a wall at each site. Salt at each site, soils around buildings, underground river water, and three types of stone are also sampled for further laboratory investigation. From the XRD analysis, only calcite (CaCO₃) is detected from salts at sites of the medieval building, whereas calcite, thenardite (Na₂SO₄), mirabilite (Na₂SO₄·10H₂O), and gypsum (CaSO₄·2H₂O) are detected at sites of the modern building. The source of Na and S in these salts is underground river water, not the reconstituted stone. Therefore, crystallization of sodium sulfates from constituents of the river water is considered to be the main cause of the deterioration of the modern building wall.

  
  Tokyo Geographical Society, Japanese
  DOI：https://doi.org/10.5026/jgeography.126.439
  DOI ID：10.5026/jgeography.126.439, ISSN：0022-135X, CiNii Articles ID：130006105213, CiNii Books ID：AN00322536
• Evaluation of geomechanical and geochemical properties in weathered metamorphic rocks in tropical environment: a case study from Samanalawewa hydropower project, Sri Lanka　　　　　　　　　　　　　　　
  Dashan T. Udagedara; Chiaki T. Oguchi; Jagath K. Gunatilake
  GEOSCIENCES JOURNAL, Volume：21, Number：3, First page：441, Last page：452, Jun. 2017, [Reviewed]
  The effect of weathering on changes of physical and mechanical properties of rocks is a prime concern in the perspectives of geology and engineering. These properties have been studied mostly on weathered igneous and sedimentary rocks under humid climates. Studies on weathering of metamorphic rocks, especially under a tropical climate, are rare. This study evaluates change of physical, mechanical, chemical, and mineralogical properties of metamorphic rocks that weather under tropical climatic conditions. Samanalawewa hydropower project area was selected for this study, because rapid weathering of a metamorphic rock (sillimanite garnet gneiss) was observed in the project site. Fresh rocks that are subjected to weathering have reached to completely weathered condition in a time span of less than 25 years in this area. Visually assessed weathering grades were physically and mechanically evaluated using bulk density, equotip hardness, porosity, specific gravity, point load strength, and slake durability tests. Mechanical properties, especially point load strength, change rapidly at the onset of weathering, while chemical properties show significant changes at later stages of weathering. Mineralogical changes such as appearance of secondary minerals are at the latter part of weathering. Physical properties gradually change during weathering. The observed changes in physical, mechanical and chemical properties indicate that their variations during weathering are independent of lithology and climatic conditions.
  GEOLOGICAL SOCIETY KOREA, English, Scientific journal
  DOI：https://doi.org/10.1007/s12303-016-0060-7
  DOI ID：10.1007/s12303-016-0060-7, ISSN：1226-4806, eISSN：1598-7477, Web of Science ID：WOS:000402868800011
• Adsorption of 133Cs and 87Sr on pumice tuff: A comparative study between powder and intact solid phase　　　　　　　　　　　　　　　
  Mohammad Rajib; Chiaki T. Oguchi
  Acta Geochimica, Volume：36, Number：2, First page：224, Last page：231, Jun. 2017, [Reviewed]
  This study examines the use of intact samples as an alternative to powder in conventional batch sorption studies to determine the distribution coefficient (Kd). Stable cesium (133Cs) and strontium (87Sr) were used under specified geochemical conditions to compare the Kd values of powder and block pumice tuff samples. The aim of the study was to infer any Kd difference under laboratory and field conditions. Kd values for block samples were found to be less than one order of magnitude lower than powder materials for both Cs and Sr on fresh tuff, and more than one order of magnitude lower in oxidized tuff. Destruction of micropores in oxidized tuff was estimated to be mainly responsible for reducing Kd values in oxidized tuff. However, approximately one order of magnitude difference in Kd values indicates that homogenously prepared intact samples can be used for sorption coefficient measurement at closer to in situ conditions. Pore size distribution analysis using mercury intrusion porosimetry revealed that lower Kd values on block samples result from lower surface area available as sorption sites due to inaccessible closed pores in the intact solid.
  Science Press, English, Scientific journal
  DOI：https://doi.org/10.1007/s11631-016-0133-3
  DOI ID：10.1007/s11631-016-0133-3, ISSN：2365-7499, SCOPUS ID：85014068925, Web of Science ID：WOS:000405285500010
• Quaternary Fluvial Environments and Palaeohydrology in Syria　　　　　　　　　　　　　　　
  Takashi Oguchi; Yuichi S. Hayakawa; Chiaki T. Oguchi
  Enzel Y. and Bar-Yosef O. (eds.) Quaternary of the Levant, Cambridge University Press, Volume：48, First page：417, Last page：422, May 2017, [Reviewed]
  Cambridge University Press, In book
  DOI：https://doi.org/10.1017/9781316106754.048
  DOI ID：10.1017/9781316106754.048
• Introduction to the Special Issue "Rock Weathering from Nanoscale to Global Scale: 1. Microscopic Weathering and Basic Studies"　　　　　　　　　　　　　　　
  MATSUOKA Norikazu; OGUCHI Chiaki T; FUKUSHI Keisuke; MATSUSHI Yuki; YOKOYAMA Tadashi
  J. Geogr., Volume：126, Number：3, First page：267, Last page：269, 2017
  Tokyo Geographical Society, Japanese
  ISSN：0022-135X, CiNii Articles ID：130005893326
• Overview of the Special Issue "Rock Weathering from Nanoscale to Global Scale: 1. Microscopic Weathering and Basic Studies"　　　　　　　　　　　　　　　
  MATSUOKA,Norikazu; OGUCHI,Chiaki T; FUKUSHI,Keisuke; MATSUSHI,Yuki; YOKOYAMA,Tadashi
  Journal of Geography (Chigaku Zasshi), Volume：126, Number：3, First page：263, Last page：265, 2017
  Tokyo Geographical Society, Japanese, Scientific journal
  DOI：https://doi.org/10.5026/jgeography.126.263
  DOI ID：10.5026/jgeography.126.263, ISSN：1884-0884
• Combination of chemical indices and physical properties in the assessment of weathering grades of sillimanite-garnet gneiss in tropical environment
  D. T. Udagedara; C. T. Oguchi; A. A. J. K. Gunatilake
  Bulletin of Engineering Geology and the Environment, Volume：76, Number：1, First page：145, Last page：157, Apr. 2016, [Reviewed]
  Springer Science and Business Media LLC, Scientific journal
  DOI：https://doi.org/10.1007/s10064-016-0878-2
  DOI ID：10.1007/s10064-016-0878-2, ISSN：1435-9529, eISSN：1435-9537
• Economic minerals in fluvial bar sediment of jamuna river, Bangladesh: Geomorphic inference for prospecting rare earth oxides　　　　　　　　　　　　　　　
  Mohammad Rajib; M. D. Moniruzzaman; Chiaki T. Oguchi
  Chikei/Transactions, Japanese Geomorphological Union, Volume：37, Number：3, First page：363, Last page：377, Mar. 2016, [Reviewed]
  Jamuna is a large sand bedded braided river of Bangladesh which leaves significant amount of sand bars along the river course. The main objective of this work is to quantify the potential economic minerals and rare earth materials from a specific river bar of Jamuna River and to infer the presence of similar materials in similar environment of deposition through geomorphic point of view. The case study deals with the identification and quantification of average concentration of dominant heavy minerals which are economically important. Heavy liquid and mechanical separation, and microscopic observation followed by X-ray analytical techniques were performed to determine heavy and light mineral percentage in raw sand as well as presence of other important elements including rare earths in those minerals. The physical separation results showed the presence of approximately 20 % heavy minerals which were identified as ilmenite, magnetite, garnet, rutile, amphibols, pyroxene, kyanite, epidote, tourmaline, zircon, monazite, etc. Such heavy mineral concentrations in Jamuna River indicate that fluvial bars of Bangladesh can be a potential place of economic mineral deposition. Analytical analysis revealed that several trace metals and rare earth elements like strontium, thorium, yttrium, niobium, cerium, neodymium, erbium etc. are present in considerable amount. Geomorphological prospecting could be a potential technique to explore the similar kind of depositions in other parts of the river. Defining such deposits and exploitation of economic minerals from those areas could be helpful for flood hazard mitigation.
  Chikei Dojo Saigai Kenkyo Bumon, English, Scientific journal
  ISSN：0389-1755, SCOPUS ID：85072654172
• Spatial Distribution of Changes in Rockwall Surface at Yoshimi-Hyakuana Cave, Central Japan, Revealed by Repeated Terrestrial Laser Scanning　　　　　　　　　　　　　　　
  Yuichi S. Hayakawa; Chiaki T. Oguchi; Natsuki Ariga; Hisashi Aoki
  WORLD MULTIDISCIPLINARY EARTH SCIENCES SYMPOSIUM, WMESS 2015, Volume：15, First page：619, Last page：626, 2015, [Reviewed]
  For the understanding of weathering processes, quantitative detection and evaluation, including volume estimation, of surficial changes in rocks are fundamental issues. To assess morphological changes in a rockwall, we perform repeated measurement of wall surface using terrestrial laser scanning (TLS) at a test site of Yoshimi-Hyakuana cave in Saitama Prefecture, central Japan. The alignment of time series of point clouds was carried out by tie-point registration method at an initial step, and further refined by cloud-based registration method using the iterative closest point (ICP) algorithm for points on stable surfaces, resulting in registration accuracies of a couple of millimeters. The distances between the point clouds were then computed, and scan errors derived from the laser scanner device itself was found to be at several millimeter scales. Digital elevation models (DEMs) on a vertical plane were then generated from the point clouds, and analyses on the difference raster's of the DEMs successively revealed portions of detachment on the wall surface. The detachment areas have typical depths of 5 to 12 mm and most frequent around 0.6-0.9 m above the ground. Supposed that the detachment is induced by salt weathering, the weathering processes including salt accumulations likely form vulnerable layers at such certain depths on the rock surface. The spatial distribution of the surficial changes will be further assessed by continuous measurements together with monitoring of amount and composition of materials detached from the wall surface. (C) 2015 The Authors. Published by Elsevier B.V.
  ELSEVIER SCIENCE BV, English, International conference proceedings
  DOI：https://doi.org/10.1016/j.proeps.2015.08.114
  DOI ID：10.1016/j.proeps.2015.08.114, ISSN：1878-5220, Web of Science ID：WOS:000370751200096
• Is sheer thenardite attack impotent compared with cyclic conversion of thenardite-mirabilite mechanism in laboratory simulation tests?　　　　　　　　　　　　　　　
  Swe Yu; Chiaki T. Oguchi
  Engineering Geology, Volume：152, Number：1, First page：148, Last page：154, Jan. 2013, [Reviewed]
  The precipitation of mirabilite during the wetting stage of a cyclic total immersion test has widely been implicated as the main damage mechanism of sodium sulfate. We, however, hypothesized that the damage contribution from thenardite cannot be discounted in laboratory tests. To verify the supposition, a series of laboratory experiments was undertaken by subjecting three types of rocks to the sodium sulfate attack. To unambiguously demonstrate the potency of thenardite, in addition to cyclic total immersion tests, continuous partial immersion tests were also performed under different environmental conditions, which allowed either sheer thenardite precipitation or reversible thenardite-mirabilite conversion. Although rock breakdown occurred only during immersion, the results clearly indicated that thenardite alone could induce significant damage in both cyclic total immersion and continuous partial immersion tests. In most cases, tests that involved mirabilite precipitation, however, were more destructive than sheer thenardite tests, regardless of the type of salt supply technique. With the same duration and temperature of the immersion stage, the difference in drying temperature influenced the degree of damage, revealing the damage contribution from thenardite even in the tests with cyclic phase conversion. The reason why mirabilite is generally credited to be more destructive than thenardite and the effect of test duration on the damage potency of thenardite are also discussed. © 2012.
  Elsevier B.V., English, Scientific journal
  DOI：https://doi.org/10.1016/j.enggeo.2012.10.009
  DOI ID：10.1016/j.enggeo.2012.10.009, ISSN：0013-7952, SCOPUS ID：84870682818, Web of Science ID：WOS:000315012900015
• An Experimental Study on Strength Deterioration of Cement Mortars by Wetting-Drying Cycles in Sodium Sulfate Aqueous Solution : Equotip hardness and unconfined compressive strength properties　　　　　　　　　　　　　　　
  TAKAYA Yasuhiko; SEKIGUCHI Akihiro; OGUCHI Chiaki
  Shigen-to-Sozai, Volume：128, Number：1, First page：23, Last page：26, Jan. 2012, [Reviewed]
  To evaluate durability of high early strength Portland cement (HES) and alumina cement (AL) mortars for sulfate attack, wetting-drying experiment was carried out. The cylindrical specimens with a size of 35 mm in diameter and 70 mm in height and seawater and saturated sodium sulfate solution at 20°C were used for the experiments. Immersion at 20°C for 2 hours, oven-drying at 40°C for 20 hours, cooling at 20°C for 2 hours, and these wetting-drying procedures were repeated for up to 35 cycles. Equotip hardness and unconfined compressive strength (UCS) of specimens were tested at intervals of several cycles. UCS of specimen decreased at first, which was followed by the drop in surface hardness to a lower value. Decrease of UCS in both mortals was attributed to sub-efflorescence (salt crystallization beneath the surface), and apparent reduction of surface hardness in HES was caused by counter scaling with efflorescence (salt crystallization at the surface). The HES mortal with many micropores (< 0.1 μm in radius) highly deteriorated rather than AL mortal which has pores larger than 0.1 μm in radius. Physical and chemical properties of mortals were due to the induction of sodium sulfate attack, which was attributed to the strength reduction of its own.
  The Mining and Materials Processing Institute of Japan, Japanese
  DOI：https://doi.org/10.2473/journalofmmij.128.23
  DOI ID：10.2473/journalofmmij.128.23, ISSN：1881-6118, CiNii Articles ID：10030172240, CiNii Books ID：AA12188381
• A comparison of the properties and salt weathering susceptibility of natural and reconstituted stones of the Orval Abbey (Belgium)　　　　　　　　　　　　　　　
  C. Thomachot-Schneider; M. Gommeaux; G. Fronteau; C. T. Oguchi; S. Eyssautier; B. Kartheuser
  Environmental Earth Sciences, Volume：63, Number：7, First page：1447, Last page：1461, Aug. 2011, [Reviewed]
  The Orval Abbey, a major monument of southern Wallonia, Belgium, was partly destroyed and rebuilt several times between the Middle Ages and the present time. The oldest parts are made of natural stones of local origin (Bajocian and Sinemurian limestones) and the most recent parts are mostly made of reconstituted stone. The process of reconstituted stone making is not known. Although confronting the same environmental conditions, the reconstituted stone is much more susceptible to weathering than the natural limestones, especially to salt crystallisation. The present study compared the mineralogical and petrophysical properties of these building materials to gather information on the making of the reconstituted stone and to understand the difference in salt susceptibility between natural and reconstituted stones. Microscopic observations and petrophysical measurements showed that the reconstituted stone is composed of debris of Sinemurian and Bajocian limestone and cement, and the salt efflorescences were thenardite. Within the cement, amorphous grains were found that may correspond to grains of clinker, which have not reacted during stone making. Although its porosity and water transfer properties were close to that of the Bajocian limestone, its pore access distribution was centred around 0.1 μm. Furthermore, the details of the pore size distribution allowed calculating salt susceptibility indices that were very high in the case of the reconstituted stone. Thus, the composition of the cement and the pore size distribution are likely the two factors explaining a high susceptibility of the reconstituted stone to salt weathering. © 2010 Springer-Verlag.
  English, Scientific journal
  DOI：https://doi.org/10.1007/s12665-010-0743-8
  DOI ID：10.1007/s12665-010-0743-8, ISSN：1866-6280, SCOPUS ID：79960274958
• Resistance of plain and blended cement mortars exposed to severe sulfate attacks　　　　　　　　　　　　　　　
  Thidar Aye; Chiaki T. Oguchi
  CONSTRUCTION AND BUILDING MATERIALS, Volume：25, Number：6, First page：2988, Last page：2996, Jun. 2011, [Reviewed]
  To emphasize the effect of physical sulfate attack on pozzolanic additions, the resistance of plain and blended cement mortars was investigated using 10% Na2SO4 and MgSO4 solutions under four exposure regimes which included the standard conventional exposure and field-like exposures that created the physical sulfate attack. Although the performance of blended cement mortars was observed to be better under a conventional exposure regime, the damage in blended cement mortars was more severe under the exposure regimes that promoted the physical sulfate attack in a Na2SO4 environment. However, the physical attack by MgSO4 was not apparent. Overall, MgSO4 was found to be more damaging than Na2SO4 from the aspect of chemical attack; however Na2SO4 was more harmful than MgSO4 as far as the physical attack is considered. (C) 2010 Elsevier Ltd. All rights reserved.
  ELSEVIER SCI LTD, English, Scientific journal
  DOI：https://doi.org/10.1016/j.conbuildmat.2010.11.106
  DOI ID：10.1016/j.conbuildmat.2010.11.106, ISSN：0950-0618, eISSN：1879-0526, Web of Science ID：WOS:000288736900029
• Quantitative Evaluation of Debris Production Due to Salt Weathering of Tuff in Yoshimi Hyaku-Ana, an Historic Site in Central Japan　　　　　　　　　　　　　　　
  TAKAYA Yasuhiko; OGUCHI T. Chiaki
  Geographical review of Japan series A, Volume：84, Number：4, First page：369, Last page：376, 2011, [Reviewed]
  The Association of Japanese Geographers, Scientific journal
  DOI：https://doi.org/10.4157/grj.84.369
  DOI ID：10.4157/grj.84.369, ISSN：1883-4388, eISSN：2185-1751, CiNii Articles ID：130005100132
• The sensitivities of the parameters in the WetSpa Extension model for the flood forecasting outputs (with an application to Ve catchment)　　　　　　　　　　　　　　　
  Chi Pham; Tom Doldersum; Chiaki T. Oguchi
  ICT&A 2011/DEMSET 2011: INTERNATIONAL CONFERENCE ON INFORMATION AND COMMUNICATION TECHNOLOGIES AND APPLICATIONS / INTERNATIONAL CONFERENCE ON DESIGN AND MODELING IN SCIENCE, EDUCATION, AND TECHNOLOGY, First page：339, Last page：344, 2011, [Reviewed]
  This study focuses on the sensitivity estimation of parameters in WetSpa Extension applying to Ve catchment in Quang Ngai Province, Vietnam. The results show that the groundwater recession coefficient K-g has the strongest sensitivity on the peak runoff and total discharge volume, and strong interaction with other parameters in the model. Surface runoff exponent corresponding to minimum rainfall intensity K-run is the parameter noticeably affecting on the time to the peak discharge.
  INT INST INFORMATICS & SYSTEMICS, English, International conference proceedings
  Web of Science ID：WOS:000392562500063
• Role of pore size distribution in salt uptake, damage, and predicting salt susceptibility of eight types of Japanese building stones　　　　　　　　　　　　　　　
  Swe Yu; Chiaki T. Oguchi
  ENGINEERING GEOLOGY, Volume：115, Number：3-4, First page：226, Last page：236, Oct. 2010, [Reviewed]
  Eight widely used Japanese building stones were subjected to crystallization attacks by three types of destructive salts to investigate whether it is possible to estimate durability of the stones solely from their pore characteristics. The influence of pore size and their distribution on salt uptake and salt crystallization damage was also evaluated. Total porosity was found to have a significant effect on the amount of salt absorbed and of damage induced. Five different upper limits of microporosity were considered in order to evaluate their relative influences on salt crystallization damage. The experimental results corroborate the theoretical supposition that micropores smaller than 0.05 (also 0.1) mu m in radius are a critical influence on salt crystallization damage. However, pores smaller than 5 pm are more important in liquid absorption in the impregnation-drying type of salt weathering test, as confirmed by the pore size distributions of pre- and post-experiment specimens. Moreover, these pores seem to act synergistically with smaller micropores in inducing crystallization damage. The results indicate that pore size distribution plays a very important role in both salt uptake and salt damage processes. Based on these pore characteristics, which can readily be obtained from a single mercury porosimetry measurement, a durability estimator called salt susceptibility index (SSI) is proposed. The estimated outcomes correlate significantly with the actual dry weight loss of the rocks tested. (C) 2009 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE BV, English, Scientific journal
  DOI：https://doi.org/10.1016/j.enggeo.2009.05.007
  DOI ID：10.1016/j.enggeo.2009.05.007, ISSN：0013-7952, Web of Science ID：WOS:000283020400012
• Laboratory experiments on bacterial weathering of granite and its constituent minerals　　　　　　　　　　　　　　　
  Wonsuh Song; Naoto Ogawa; Chiaki Oguchi; Tamao Hatta; Yukinori Matsukura
  GEOMORPHOLOGIE-RELIEF PROCESSUS ENVIRONNEMENT, Number：4, First page：327, Last page：336, Oct. 2010, [Reviewed]
  This study focuses on weathering of granitic minerals by the bacteria Bacillus subtilis, especially how the ubiquitous soil bacterium Bacillus subtilis weathers granitic minerals through image analysis of mineral surface, and which mineral in the granite is the most vulnerable to weathering in a bacterial circumstance through comparison of using rock and single minerals analysis. Laboratory experiments reveal three basic conclusions: (i) Bacteria enhance weathering of granite and its constituent minerals by making pits on the mineral surface; (ii) The plagioclase is the most vulnerable mineral in bacteria-bearing granite. In the mineral experiments, albite (plagioclase group) is the most vulnerable in bacterial experiment; (iii) The orders of normalised pit-area ratio and pit density in bacteria-hearing granite are in accorded with the traditional weathering-series; this accordance suggests that bacterial weathering may have a large effect as biochemical weathering process.
  GROUPE FRANCIAS GEOMORPHOLOGIE, English, Scientific journal
  ISSN：1266-5304, eISSN：1957-777X, Web of Science ID：WOS:000286043300002
• Fundamental experiments examining the effect of salinity and CO2 gas condition on limestone dissolution in seawater　　　　　　　　　　　　　　　
  Yasuhiko Takaya; Chiaki T. Oguchi
  Chikei/Transactions, Japanese Geomorphological Union, Volume：31, Number：3, First page：283, Last page：299, Jul. 2010, [Reviewed]
  This study aims to elucidate the effect of salinity and CO2 gas on dissolution characteristics of limestone in seawater. Laboratory experiments were carried out using three kinds of limestone of Okinawa (Motobu, Ryukyu and Awa-ishi) and four kinds of artificial seawater with quarter, half, normal and twice of salt concentrations. Tablet-type specimen (3.5-cm diameter, 1.0-cm height) was treated with pure water and seawater of 200.0 mL during 360 days at first, then, the system was in the atmosphere containing CO2 of 5% and N2 of 95% during 60 days. After the experiment, major element concentration and surface chemical composition were analyzed. Precipitate minrals were also determined. Experimental results in pure water under closed condition showed that porous limestone (Awa-ishi) dissolved remarkably, whereas compact limestone (Motobu) formed precipitate products of calcite on its surface which dissolved subsequently under CO2 gas atmosphere. In the reaction of limestone with seawater, dissolution and precipitation were interchanged easily according to some conditions. Product mineral of calcite formed on the surface under closed condition, and aragonite precipitated at Motobu limestone under high salt concentration and CO2 gas condition. Additionally, dissolution did not proceed currently at high salt concentration, but proceeded at low salt concentration under the closed condition. Under CO2 gas condition, limestone dissolved more remarkably at higher salt concentration.
  Japanese, Scientific journal
  ISSN：0389-1755, SCOPUS ID：79955023082
• Evaluation of sulfate resistance of Portland and high alumina cement mortars using hardness test　　　　　　　　　　　　　　　
  Thidar Aye; Chiaki T. Oguchi; Yasuhiko Takaya
  CONSTRUCTION AND BUILDING MATERIALS, Volume：24, Number：6, First page：1020, Last page：1026, Jun. 2010, [Reviewed]
  Portland cement and high alumina cement mortar specimens were exposed to cycles of drying at 40 degrees C, cooling at 20 degrees C and immersion in Na(2)SO(4) and MgSO(4) solutions at 20 degrees C. The resistance of mortars was evaluated by visual inspection and by measuring the change in surface hardness and weight of the specimens. The decrease and increase in surface hardness were observed in both mortars by treating with Na(2)SO(4) and MgSO(4) solutions, respectively. The combined effect of the chemical and physical attack by Na(2)SO(4) was attributed to the complete failure of Portland cement mortar, whereas only marginal damage of high alumina cement mortar was believed owing to physical salt crystallization. No damage was observed in both mortars treated with MgSO(4) solution. (c) 2009 Elsevier Ltd. All rights reserved.
  ELSEVIER SCI LTD, English, Scientific journal
  DOI：https://doi.org/10.1016/j.conbuildmat.2009.11.016
  DOI ID：10.1016/j.conbuildmat.2009.11.016, ISSN：0950-0618, Web of Science ID：WOS:000277781000018
• Simultaneous wetting/drying, freeze/thaw and salt crystallization experiments of three types of Oya tuff　　　　　　　　　　　　　　　
  Chiaki T. Oguchi; Hayato Yuasa
  Geological Society Special Publication, Volume：333, First page：59, Last page：72, 2010, [Reviewed], [Lead]
  An abandoned subsurface Oya tuff quarry in Japan had abundant salt efflorescence in winter. Besides salt weathering, freeze-thaw weathering and slaking were likely to occur because of winter temperatures below 0°C and the presence of swelling clays in the rock. Field surveys were performed to collect salts. Thenardite and gypsum were detected by X-ray diffraction (XRD) as the main salts, along with zeolites as secondary minerals. Oya tuff is categorized into three types for practical usage. To investigate petrophysical differences among the three types of Oya tuff, mercury intrusion porosimetry and tensile strength tests were performed. To determine the influence of petrophysical properties on salt weathering, freeze-thaw weathering and slaking (wet-dry weathering), all three types of Oya tuff were used for experiments. Prismatic specimens, the bases of which were sunk into distilled water, were used for the freeze-thaw and slaking experiments and Na2SO4 saturated solution was used for the salt-weathering experiment. The results show that the specimens subjected to salt weathering were the most severely damaged. The coarse-type Oya tuff sustained the most severe damage, whereas the fine type received the least. There was a large amount of debris in the coarse type, but less in the fine type. The weathering susceptibility index WSI was also calculated from the results of the pore size analyses and tensile strength. The index decreases with increasing weathering cycles representing resistant rocks. The phenomena of weathering of Oya tuff were explained by three weathering experiments on three kinds of tuff. The WSI may be useful as a practical indicator of rock weathering. © The Geological Society of London 2010.
  English, Scientific journal
  DOI：https://doi.org/10.1144/SP333.6
  DOI ID：10.1144/SP333.6, ISSN：0305-8719, SCOPUS ID：77955987698
• Mt. Fuji: The beauty of a symmetric stratovolcano　　　　　　　　　　　　　　　
  Takashi Oguchi; Chiaki T. Oguchi
  Geomorphological Landscapes of the World, First page：303, Last page：309, 2010, [Reviewed]
  Mt. Fuji, the highest mountain in Japan, is internationally known for its attractive landscape, which resulted from the repeated basaltic eruptions near the junction of the four major tectonic plates since the Middle Pleistocene. Although Mt. Fuji has a relatively simple symmetrical shape, it consists of various geomorphological and geological components such as old buried volcanic bodies, deposits of huge sector collapses, craters on volcanic flanks, and some distinct valleys. Geomorphological and geological knowledge is important for providing strategies to cope with future possible volcanic hazards in and around Mt. Fuji. © 2010 Springer Science+Business Media B.V.
  In book
  DOI：https://doi.org/10.1007/978-90-481-3055-9_31
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84895387946&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84895387946&origin=inward
  DOI ID：10.1007/978-90-481-3055-9_31, SCOPUS ID：84895387946
• Is sodium sulphate invariably effective in destroying any type of rock?　　　　　　　　　　　　　　　
  Swe Yu; Chiaki T. Oguchi
  Geological Society Special Publication, Volume：333, First page：43, Last page：58, 2010, [Reviewed]
  Sodium sulphate has been implicated as one of the most destructive weathering agents in many field observations and numerous laboratory studies. We hypothesize however, that sodium sulphate would not be invariably effective on any type of rock. To verify the supposition, a laboratory cyclic impregnation-drying experiment was undertaken. In addition to sodium sulphate, two other destructive hydratable salts, magnesium sulphate and sodium carbonate, were used to attack eight types of rock. In all three salt attacks, rock breakdown occurred only during immersion due to the exertion of higher crystallization pressure driven by the greater supersaturation reached after dissolution of the crystals precipitated during drying. Sodium sulphate was the most destructive salt in six out of the eight rocks tested, and even granite was substantially disintegrated. However, although probability is small, sodium sulphate indeed manifested its impotency against a relatively weak rock (Tago Sandstone). Contrary to its modest damaging power on other rocks, magnesium sulphate destroyed Tago Sandstone which could resist sodium sulphate attack. Sodium carbonate was the least destructive of the three hydratable salts. The general damage mechanism of hydratable salts, the process of damage of Tago Sandstone by magnesium sulphate and the possible reasons behind the impotency of sodium sulphate against Tago Sandstone are all investigated. © The Geological Society of London 2010.
  English, In book
  DOI：https://doi.org/10.1144/SP333.5
  DOI ID：10.1144/SP333.5, ISSN：0305-8719, SCOPUS ID：77956009378
• An Experimental Study on Surface Alteration of Mortars Reacted with Seawater　　　　　　　　　　　　　　　
  TAKAYA Yasuhiko; AOKI Takuro; OGUCHI Chiaki T.
  Nendo Kagaku, Volume：47, Number：1, First page：25, Last page：33, Apr. 2008, [Reviewed]
  This study aims to elucidate the alteration mechanism of mortar surface reacted with seawater and the relationship between characteristics of secondary products on the surface and salt concentration of seawater. The experiment was carried out in closed system using two kinds of mortars which were made from high-early-strength portland cement (HES) or alumina cement (AL) and silica sand, and two kinds of artificial seawater with half or twice of salt concentrations. Tablet type specimen (3.5-cm diameter, 1.0-cm height) was treated with seawater of 200.0 mL during 20 days. Results of the experiment showed that white products were crystallized on the surface of a tablet in each case. The products were characterized using SEM and XRD. In HES, petal shaped brucite, Mg(OH)_2, was produced by the reaction of portlandite, Ca(OH)_2, with Mg component in seawater. In AL, needle or column shaped aragonite, CaCO_3, was formed. Under high salt concentration of seawater crystalline size of brucite is relatively large in HES, production of aragonite are promoted.
  The Clay Science Society of Japan, Japanese, Scientific journal
  ISSN：0470-6455, CiNii Articles ID：110006664662, CiNii Books ID：AN00199972
• Effect of Bacillus subtilis on granite weathering: A laboratory experiment　　　　　　　　　　　　　　　
  W. Song; N. Ogawa; C.T. Oguchi; T. Hatta; Y. Matsukura
  CATENA, Volume：70, Number：3, First page：275, Last page：281, Aug. 2007, [Reviewed]
  Elsevier BV, Scientific journal
  DOI：https://doi.org/10.1016/j.catena.2006.09.003
  DOI ID：10.1016/j.catena.2006.09.003, ISSN：0341-8162, eISSN：1872-6887, CiNii Articles ID：10021839212, Web of Science ID：WOS:000248715200001
• Ten year measurements of weathering rates of rock tablets on a forested hillslope in a humid temperate region, Japan　　　　　　　　　　　　　　　
  Yukinori Matsukura; Tsuyoshi Hattanji; Chiaki T. Oguchi; Takashi Hirose
  ZEITSCHRIFT FUR GEOMORPHOLOGIE, Volume：51, Number：1, First page：27, Last page：40, 2007, [Reviewed]
  To study the effect of rock type and geomorphic setting on weathering rates, field experiments were performed using the microweight loss technique. Tablets of eight types of rock - granite, granodionte, gabbro, limestone, andesite, rhyolite, crystalline schist and tuff - with a diameter of 3.5 cm and a thickness of about 1 cm, were enclosed in nylon mesh bags and placed in four distinct locations on a granodiorite hillslope in central Japan for 10 years. The main findings are that (1) limestone has distinctive weathering characteristics compared to other rocks; (2) limestone and granodiorite in a saturated environment have high susceptibility to chemical weathering; and (3) physical weathering is dominant on the ground and in unsaturated soil layers.
  GEBRUDER BORNTRAEGER, English, Scientific journal
  DOI：https://doi.org/10.1127/0372-8854/2007/0051S-0027
  DOI ID：10.1127/0372-8854/2007/0051S-0027, ISSN：0372-8854, Web of Science ID：WOS:000246774700002
• Quaternary bedrock erosion and landscape evolution in the Sør Rondane Mountains, East Antarctica: Reevaluating rates and processes　　　　　　　　　　　　　　　
  Norikazu Matsuoka; Céline E. Thomachot; Chiaki T. Oguchi; Tamao Hatta; Masahiro Abe; Hiroyuki Matsuzaki
  Geomorphology, Volume：81, Number：3-4, First page：408, Last page：420, Nov. 2006, [Reviewed]
  Elsevier BV, Scientific journal
  DOI：https://doi.org/10.1016/j.geomorph.2006.05.005
  DOI ID：10.1016/j.geomorph.2006.05.005, ISSN：0169-555X, Web of Science ID：WOS:000242879700013
• Rates of chemical weathering of porous rhyolites: ten-year measurements using a weight-loss method　　　　　　　　　　　　　　　
  MATSUKURA Yukinori; HATTANJI Tsuyoshi; OGUCHI Chiaki T.; HIROSE Takashi
  Tsukuba Geoenvironmental Sciences, Volume：2, Jul. 2006, [Reviewed]
  ISSN：1880-6252, J-Global ID：200902278415582420
• Application of weathering susceptibility index to salt damage on a brick monument　　　　　　　　　　　　　　　
  C. T. Oguchi; Y. Matsukura; H. Shimada; N. Kuchitsu
  Heritage, Weathering and Conservation, Vols 1 and 2, First page：217, Last page：227, 2006, [Reviewed], [Lead]
  Although various kinds of salts and their influence on landforms or stone structures have been reported, the relationship between salt weathering and rock properties has not been clarified. To make clear this, field observations on two-storied brick kiln and laboratory experiments were performed. The second floor walls are more severely weathered than the first (ground) floor walls. Gypsum, thenardite and hexahydrite and the small amount of halite were found from the bottom to the upper of the wall in this order. Spatial variations in types of salts result from their own efflorescence-deliquescence characteristics caused by the temperature dependence of the solubilities and equilibrium relative humidities. Two kinds of laboratory experiments were carried out using two types of bricks and four kinds of solutions; experiment A was aimed at capillary height investigation and experiment B was performed to evaluate weathering susceptibility. Results show that starting cycle of weathering has a high correlation to WSI value, formulated into the parameters such as crystallization pressure, pore size distribution, porosity and tensile strength.
  TAYLOR & FRANCIS LTD, English, International conference proceedings
  Web of Science ID：WOS:000241891500032
• Stability analysis on a rock collapse over an abandoned mine cave in Miocene tuff　　　　　　　　　　　　　　　
  Hisashi Aoki; Tomoya Sasaki; Chiaki T. Oguchi; Yukinori Matsukura
  Chikei/Transactions, Japanese Geomorphological Union, Volume：26, Number：4, First page：423, Last page：437, Oct. 2005, [Reviewed]
  A large sinkhole due to rock collapse of a roof of an abandoned subsurface quarry composed of Miocene tuff (Oya Tuff) occurred on 10th February 1989 at Sakamoto, Oya-chou, Utsunomiya City. The plan shape of fallen block shows an almost perfect circle, having a mean diameter of 65 m and a thickness of about 30 m. Compressive strength, tensile strength and P-wave velocity of Oya Tuff were tested in laboratory. Equotip hardness test was conducted in associated with changing in rock strength due to variation of water content. Shear strength of rock mass was expressed as a function of compressive and tensile strengths as well as water content of rock specimen. Rock mass strength considering-the scale effect was estimated using Ikeda's index, i.e., the ratio of P-wave velocity in situ and that in a laboratory for specimens. The stability analysis for the mine roof using the rock mass strength shows that the roof reaches a critical condition when the water content of rock mass increases to about 20 %.
  Scientific journal
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=27844442742&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=27844442742&origin=inward
  ISSN：0389-1755, SCOPUS ID：27844442742
• Salt damage to brick kiln walls in Japan: spatial and seasonal variation of efflorescence and moisture content
  Yukinori Matsukura; ChiakiT. Oguchi; Nobuaki Kuchitsu
  Bulletin of Engineering Geology and the Environment, Volume：63, Number：2, May 2004, [Reviewed]
  Springer Science and Business Media LLC, Scientific journal
  DOI：https://doi.org/10.1007/s10064-003-0211-8
  DOI ID：10.1007/s10064-003-0211-8, ISSN：1435-9529, eISSN：1435-9537, SCOPUS ID：3242815533
• Late Quaternary rapid talus dissection and debris flow deposition on an alluvial fan in Syria　　　　　　　　　　　　　　　
  Takashi Oguchi; Chiaki T. Oguchi
  CATENA, Volume：55, Number：2, First page：125, Last page：140, Jan. 2004, [Reviewed]
  Elsevier BV, Scientific journal
  DOI：https://doi.org/10.1016/s0341-8162(03)00112-7
  DOI ID：10.1016/s0341-8162(03)00112-7, ISSN：0341-8162, Web of Science ID：WOS:000188861600003
• Effect of microstructure and weathering on the strength anisotropy of porous rhyolite　　　　　　　　　　　　　　　
  Y Matsukura; K Hashizume; C.T Oguchi
  Engineering Geology, Volume：63, Number：1-2, First page：39, Last page：47, Jan. 2002, [Reviewed]
  Elsevier BV, Scientific journal
  DOI：https://doi.org/10.1016/s0013-7952(01)00067-9
  DOI ID：10.1016/s0013-7952(01)00067-9, ISSN：0013-7952, CiNii Articles ID：80012898793, Web of Science ID：WOS:000173435700004
• Rates of chemical weathering of porous rhyolites: 5-year measurements using the weight-loss method　　　　　　　　　　　　　　　
  Y Matsukura; T Hirose; CT Oguchi
  CATENA, Volume：43, Number：4, First page：341, Last page：347, May 2001, [Reviewed]
  To examine the rate of chemical weathering, field experiments using microweight-loss techniques were carried out. Two kinds of porous rhyolite forming lava domes in Kozu-shima Island were selected: (1) a younger rock (weathering period is 2.6 ka) and (2) an older rock (20 ka). Both rocks seem to have been very similar in their initial composition and structure. They have, however, different properties in the present depending on the difference in weathering period. Rock tablets of these rhyolites with a diameter of 3.5 cm and a thickness of about 1 cm were enclosed in a nylon mesh bag and placed in a soil-bedrock interface on a hillslope of central Japan for over 5 years. The younger rock has a lower weight loss by about 0.5%, and the older rock has a higher weight loss of 3% to 5%. These results show that older rock has a higher rate of chemical weathering than in younger rock. This supports Oguchi et al.'s (Oguchi, T.C., Hatta, T., Matsukura, Y., 1994. Changes in rock properties of porous rhyolite through 40,000 years in Kozu-shima Island, Japan. Geogr. Rev. Jpn. 67A, 775-793 (in Japanese, with English Abstr.); Oguchi, T.C., Hatta, T., Matsukura, Y., 1999. Weathering rates over 40,000 years based on changes in rock properties of porous rhyolite. Phys. Chem. Earth (A) 24, 861-870.) finding that the rate of change in chemical properties appears to accelerate with weathering time. (C) 2001 Elsevier Science B.V. All rights reserved.
  ELSEVIER SCIENCE BV, English, Scientific journal
  ISSN：0341-8162, Web of Science ID：WOS:000167800900005
• Karst Landforms in Western Ireland : Report from the Field Trip of the International Conference, 'Weathering 2000', Belfast, UK　　　　　　　　　　　　　　　
  OGUCHI Chiaki T.
  Journal of the Speleological Society of Japan., Volume：25, First page：56, Last page：62, Dec. 2000
  Japanese
  ISSN：0386-233X, CiNii Articles ID：40004174498, CiNii Books ID：AN0016499X
• Effect of porosity on the increase in weathering-rind thicknesses of andesite gravel　　　　　　　　　　　　　　　
  Chiaki T. Oguchi; Yukinori Matsukura
  Developments in Geotechnical Engineering, Volume：84, Number：C, First page：305, Last page：317, 2000, [Reviewed], [Lead]
  Factors affecting the increase in weathering-rind thickness, i.e. weathering rates, were investigated using andesite gravel in fluvial terrace deposits with a known emergence time. The time between the age of each terrace formation (20, 130, 290 and 660 ka) and the present was assumed to be the weathering period. Three zones were classified from measurements of the Vickers hardness number (VHN) across weathering rinds from the rock surface to the inner fresh part: (1) Zone I, the outermost brown layer, which has low VHN values of 10 to 80 gf/μm2
  (2) Zone II, the inner gray layer which has increasing VHN values (100 to 500 gf/μm2) with increasing depth
  (3) the innermost fresh part, which has large VHN values of 500 gf/μm2. In this paper, Zones I and I+II are defined as the brown layer and the weathering rind, respectively. Diffusion theory was applied to the relationship, between the thickness of the brown layer or the weathering rind and time (weathering periods). The results show that the thickness of the brown layer depends mainly on time, whereas the thickness of the weathering rind is controlled by the porosity of the host rock as well as time. Consequently, rocks with higher porosity have thicker weathering rinds than brown layers. © 2000 Elsevier B.V. All rights reserved.
  English, Scientific journal
  DOI：https://doi.org/10.1016/S0165-1250(00)80025-5
  DOI ID：10.1016/S0165-1250(00)80025-5, ISSN：0165-1250, SCOPUS ID：77956703889
• Effect of porosity on the increase in weathering-rind thicknesses of andesite gravel　　　　　　　　　　　　　　　
  Chiaki T. Oguchi; Yukinori Matsukura
  Engineering Geology, Volume：55, Number：1-2, First page：77, Last page：89, Jan. 2000, [Reviewed], [Lead]
  Elsevier BV, Scientific journal
  DOI：https://doi.org/10.1016/s0013-7952(99)00108-8
  DOI ID：10.1016/s0013-7952(99)00108-8, ISSN：0013-7952, CiNii Articles ID：80011401115, SCOPUS ID：0034097276
• Weathering rates over 40,000 years based on changes in rock properties of porous rhyolite　　　　　　　　　　　　　　　
  C.T. Oguchi; T. Hatta; Y. Matsukura
  Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy, Volume：24, Number：10, First page：861, Last page：870, Nov. 1999, [Reviewed], [Lead]
  Elsevier BV, Scientific journal
  DOI：https://doi.org/10.1016/s1464-1895(99)00128-3
  DOI ID：10.1016/s1464-1895(99)00128-3, ISSN：1464-1895, Web of Science ID：WOS:000084186900003
• The Change in Microstructure of Porous Rhyolite due to Weathering and its Influence on the Reduction of Rock Strength　　　　　　　　　　　　　　　
  OGUCHI Chiaki T.; MATSUKURA Yukinori
  Volume：17, Number：1, First page：1, Last page：15, Jan. 1996, [Reviewed], [Lead]
  Japanese, Scientific journal
  ISSN：0389-1755, CiNii Articles ID：10002187199, CiNii Books ID：AN00333248
• Changes in Rock Properties of Porous Rhyolite through 40,000 Years in Kozu-shima Island, Japan　　　　　　　　　　　　　　　
  OGUCHI Chiaki; HATTA Tamao; MATSUKURA Yukinori
  Geographical review of Japan. Ser.A, Volume：67, Number：11, First page：775, Last page：793, Nov. 1994, [Reviewed], [Lead]
  In an attempt to explore the mechanism for rock weathering, temporal changes in various kinds of rock properties due to weathering were investigated selecting Kozu-shima, a small island in the Pacif-ic, as the study site (Fig. 1). In this island four lava domes formed successively with eruption of rhyo-lite, at 1, 100, 2, 600, 20, 000 and 40, 000 y BP (Table 1). These four rhyolites with different ages are de-noted here as the 1.1-ka, 2.6-ka, 20-ka and 40-ka rocks, respectively. It was found in preliminary analy-ses that all four are biotite rhyolite, with (1) a mineral composition of about 85-90% glassy ground-mass and about 10-15% phenocrysts such as quartz, plagioclase, and biotite (Photo 2); (2) a chemi-cal composition of 74-77% SiO₂ and 12-13% Al₂O₃ content (Table 2); and (3) a porosity of about 30% (Table 3). These findings suggest that the rocks had similar original properties when the lava domes formed.
  The following field evidence is recognized. (1) The rocks show little change in lithofacies with in-creasing depth from the ground surface on each outcrop of quarries having a height of 10-20m: no common weathering profile has developed (Photo 1). (2) Schmidt hammer rebound values do not vary with depth on each outcrop (Fig. 2). These observations lead to the first conclusion, that the porous rhyolite has characteristics of so-called “deep weathering”. This high susceptibility to weathering seems to be due to rapid extension of water-rock interaction to the deeper zone, which is facilitated by the presence of (1) a large number of cooling joints with the vertical and horizontal surfaces in a rock mass and (2) a high porosity in a rock block, say, about 30 %, both yielding high permeability in rhyolite.
  Deep and uniform weathering in each lava dome indicates that the present-day rock properties can be assumed to represent the degree of weathering in the time elapsed from each eruption. Rock block samples taken from the outcrop in each dome are analyzed in detail in the laboratory. Minera-logical characteristics of the four rocks were investigated: (1) X-ray diffraction analyses show that clay minerals such as kaolinite and mica clay minerals are formed in older rocks such as the 20-ka and 40-ka rocks (Fig. 3); and (2) SENT photographs show that flow structure in the glassy groundmass is clear in younger rocks such as the 1.1-ka and 2.6-ka rocks, but unclear in the older rocks (Photos 5 and 6) . Chemical composition obtained by X-ray fluorescence analysis and thermo-gravimetry indicates that the amounts of SiO₂, Na₂O, and K₂O decrease slightly in the younger rocks and decrease rapidly in the older rocks, while those of H2_O and FeO^* (FeO+Fe₂O₃) increase slightly in the younger rocks and rapidly in the older rocks (Fig. 5). The SiO₂/Al₂O₃ ratio gradually de-creases in the older rocks (Fig. 6). High leaching of SiO₂ suggests that the solution percolating through the rock mass and block has a high pH. This is supported by the fact that Kozu-shima has been located in the humid and warm environment through the late Quaternary.
  The Association of Japanese Geographers, English, Scientific journal
  DOI：https://doi.org/10.4157/grj1984a.67.11_775
  DOI ID：10.4157/grj1984a.67.11_775, ISSN：0016-7444, CiNii Articles ID：110000521401, CiNii Books ID：AN1016484X
• 火山岩の風化プロセス : 従来の研究とその問題点　　　　　　　　　　　　　　　
  小口 千明; 八田 珠郎; 松倉 公憲
  Volume：18, First page：5, Last page：17, 1993, [Reviewed], [Lead]
  Japanese
  ISSN：0385-907X, CiNii Articles ID：110000259160, CiNii Books ID：AN00148960

• 小口千明 営力と大地形 「楯状地（ギアナ高地、ベネズエラ）」 地理・地図資料　　　　　　　　　　　　　　　
  2008
• 小口千明 営力と大地形 「ギャオ（アルマンナ・ギャオ、アイスランド）」 地理・地図資料　　　　　　　　　　　　　　　
  2008
• 小口千明・松下章・八田珠郎 第135回農林交流センターワークショップ「固体試料分析の基礎」 比表面積測定　　　　　　　　　　　　　　　
  2008
• 小口千明 営力と大地形 「楯状地（ギアナ高地、ベネズエラ）」 地理・地図資料　　　　　　　　　　　　　　　
  帝国書院, 2008
• 小口千明 営力と大地形 「ギャオ（アルマンナ・ギャオ、アイスランド）」 地理・地図資料　　　　　　　　　　　　　　　
  帝国書院, 2008
• 小口千明・松下章・八田珠郎 第135回農林交流センターワークショップ「固体試料分析の基礎」 比表面積測定　　　　　　　　　　　　　　　
  農林交流センター・国際農林水産業研究センター, 2008

• Outline of sustainable research for the conservation and utilization of Underground Built Heritage ′′Taya Cave′′　　　　　　　　　　　　　　　
  TAMURA Yasuhiko; OGUCHI Chiaki T.; HAYAKAWA Yuichi S.; OGURA Takuro
  日本地球惑星科学連合大会予稿集(Web), 2023
  2023 - 2023
• Clarification of obscure characters by using SfM 3D photogrammetry on disaster memorial stelae　　　　　　　　　　　　　　　
  GOTO Reon; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2023
  2023 - 2023
• Study on the effect of pore size distribution on brick deterioration　　　　　　　　　　　　　　　
  KASUGA Mizuki; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2023
  2023 - 2023
• Study on the effect of pore diameter distribution on elastic wave velocities of various stone materials　　　　　　　　　　　　　　　
  TAKAHASHI Keishin; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2023
  2023 - 2023
• Weathering mechanism of limestones submitted to a combination of freezing and salt crystallization　　　　　　　　　　　　　　　
  KUDO Yuzuki; SCHNEIDER Celine Elise; OGUCHI Chiaki T.; BROCCOLATO Camille; PANI Carla
  日本地球惑星科学連合大会予稿集(Web), 2023
  2023 - 2023
• Experimental study countermeasure against slaking of silane-based repellents by five types of tuff specimens.　　　　　　　　　　　　　　　
  KUDO Yuzuki; IKEDA Yukina; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2022
  2022 - 2022
• Salt weathering in the archaeological site of Yoshimi Hyaku Ana (Saitama, Japan): the petrographic and environmental background　　　　　　　　　　　　　　　
  GERMINARIO Luigi; GERMINARIO Luigi; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2022
  2022 - 2022
• Study on the relationship between chemical weathering indices and clay-silt rates of the slope soil layers in granitic bedrock areas　　　　　　　　　　　　　　　
  OGUCHI Chiaki T.; NAKAMURA Konomi; WAKATSUKI Tsuyoshi
  日本地球惑星科学連合大会予稿集(Web), 2022
  2022 - 2022
• An attempt to identify minerals by a simple in situ field survey of secondary products of weathering　　　　　　　　　　　　　　　
  TOMOKI Kamoshida; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2022
  2022 - 2022
• A study on the applicability of nondestructive survey in Taya cave　　　　　　　　　　　　　　　
  OGUCHI Chiaki T.; NOSHIRO Sota; TAMURA Yasuhiko
  日本地球惑星科学連合大会予稿集(Web), 2022
  2022 - 2022
• Evaluation of temperature dependance for adsorption of heavy metals onto soils and sediments　　　　　　　　　　　　　　　
  KURITA Keigo; SAITO Takeshi; OGUCHI Chiaki T.; KAWABE Yoshishige
  日本地球惑星科学連合大会予稿集(Web), 2022
  2022 - 2022
• Arsenic in pore waters contained in natural sediment at the northern part of the Kanto Plain, Japan　　　　　　　　　　　　　　　
  HACHINOHE Shoichi; HOSSAIN Sushmita; ISHIYAMA Takashi; HIDEKI Hamamoto; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2022
  2022 - 2022
• Mineralogical and microclimatic control on the salt weathering of Oya stone　　　　　　　　　　　　　　　
  GERMINARIO Luigi; GERMINARIO Luigi; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2021
  2021 - 2021
• Estimate slope angle of landslide initiation areas using DEMs and Air-photogrametry; Case study of disaster areas in Hiroshima prefecture　　　　　　　　　　　　　　　
  KUMARI M.A.K.; WAKATSUKI Tsuyoshi; OGUCHI Chiaki T.; SATO Masato
  地形, 2020
  2020 - 2020
• Unveiling the underground cultural heritage of Yokohama, Japan -the contribution of geosciences　　　　　　　　　　　　　　　
  GERMINARIO Luigi; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2020
  2020 - 2020
• Study on relationship between water content, NIR absorbance and colour values of various stones and cement mortars　　　　　　　　　　　　　　　
  OGUCHI Chiaki T.; TANAKA Keni’chiro
  日本地球惑星科学連合大会予稿集(Web), 2020
  2020 - 2020
• Effectiveness of waterproofing protection coating on salt weathering experiment using building stones　　　　　　　　　　　　　　　
  OGUCHI Chiaki T.; SASAKI Akimune
  日本地球惑星科学連合大会予稿集(Web), 2020
  2020 - 2020
• Representation of three-dimensional cave structure using point cloud data by terrestrial and airborne laser scanning　　　　　　　　　　　　　　　
  HAYAKAWA Yuichi S.; HAYAKAWA Yuichi S.; OGURA Takuro; TAMURA Yasuhiko; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2020
  2020 - 2020
• Study on groundwater quality inside of the Taya cavern　　　　　　　　　　　　　　　
  OGUCHI Chiaki T.; AHN Sohyun; TAMURA Yasuhiko
  日本地球惑星科学連合大会予稿集(Web), 2020
  2020 - 2020
• 高頻度・高精細地形情報を用いた地理的思考を促す地球科学教育の実践　　　　　　　　　　　　　　　
  小倉 拓郎; 早川 裕弌; 青木 賢人; 林 紀代美; 山内 啓之; 小口 高; 田村 裕彦; 小口 千明
  Mar. 2019
  Oral presentation
• Vertical variation of clay mineral distribution in marine and non-marine sediments of Kanto lowland, Japan　　　　　　　　　　　　　　　
  HOSSAIN Sushmita; HACHINOHE Shoichi; ISHIYAMA Takashi; OGUCHI Chiaki T.
  地形, 2019
  2019 - 2019
• TLS measurement data and 3D printing of an artificial cave for geotechnical and educational applications　　　　　　　　　　　　　　　
  HAYAKAWA Yuichi S.; HAYAKAWA Yuichi S.; OGURA Takuro; OGURA Takuro; TAMURA Yasuhiko; OGUCHI Chiaki T.; SHIMIZU Kisara
  日本地球惑星科学連合大会予稿集(Web), 2019
  2019 - 2019
• Physical and mechanical properties for damage assesment of Taya Cave rocks, central Japan　　　　　　　　　　　　　　　
  OGUCHI Chiaki T.; AKIMOTO Yurina; TAMURA Yasuhiko; SAKANE Kaisei
  日本地球惑星科学連合大会予稿集(Web), 2019
  2019 - 2019
• Study on creation of 3D model by SfM photogrammetry: An example of Taya Cave　　　　　　　　　　　　　　　
  SHIMIZU Kisara; OGUCHI Chiaki T.; TAMURA Yasuhiko; HAYAKAWA Yuichi S.; OGURA Takuro; OGATA Keisuke
  日本地球惑星科学連合大会予稿集(Web), 2019
  2019 - 2019
• Leaching behavior of As, Pb, Cd and Se in subsurface marine and nonmarine sedimentary environment in central Kanto plain, Japan　　　　　　　　　　　　　　　
  HOSSAIN Sushmita; ISHIYAMA Takashi; HACHINOHE Shoichi; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2019
  2019 - 2019
• Non-destructive field measurement for investigation of deteriorated parts of an artificial cave　　　　　　　　　　　　　　　
  SAKANE Kaisei; OGUCHI Chiaki T.; TAMURA Yasuhiko
  日本地球惑星科学連合大会予稿集(Web), 2019
  2019 - 2019
• P30 MECHANISMS OF LEACHING BEHAVIOR OF SOME METALS IN SEDIMENTS OF KANTO LOWLANDS, JAPAN.　　　　　　　　　　　　　　　
  HOSSAIN Sushmita; ISHIYAMA Takashi; HACHINOHE Shoichi; T. OGUCHI Chiaki
  粘土科学討論会講演要旨集(Web), 2019
  2019 - 2019
• Identification of dominant clay mineral in variable subsurface depositional environmental sediments of Kanto lowland, Japan　　　　　　　　　　　　　　　
  HOSSAIN Sushmita; ISHIYAMA Takashi; HACHINOHE Shoichi; OGUCHI Chiaki T.
  地形, 2018
  2018 - 2018
• A conceptual model for the biological weathering in Angkor Wat temple.　　　　　　　　　　　　　　　
  SONG Wonsuh; WARAGAI Tetsuya; OGUCHI Chiaki T.
  地形, 2018
  2018 - 2018
• Geochemical and mineralogical changes affecting to weathering indices of several granitic slopes in Japan　　　　　　　　　　　　　　　
  IMAM Md Hasan; WAKATSUKI Tsuyosi; UEDA Mariko; OGUCHI Chiaki T.
  地形, 2018
  2018 - 2018
• Climatic influences on weathering degree of soil layer in the soil-slip scar on granitic slopes in Japan　　　　　　　　　　　　　　　
  IMAM Md. Hasan; IMAM Md. Hasan; OGUCHI Chiaki T.; WAKATSUKI Tsuyoshi; UEDA Mariko
  地形, 2018
  2018 - 2018
• A11 Clay minerals in subsurface sediment of lowland in central Kanto plain and its relationship with depositional environment　　　　　　　　　　　　　　　
  Hossain Sushmita; Ishiyama Takashi; Hachinohe Shoichi; Oguchi Chiaki T.
  粘土科学討論会講演要旨集(Web), 2018
  2018 - 2018
• P34 Climatic influences on chemical composition and clay minerals of weathered materials in the soil-slip scar on granitic slopes in Japan　　　　　　　　　　　　　　　
  Imam Md. Hasan; Oguchi Chiaki T.; Wakatsuki Tsuyoshi; Ueda Mariko
  粘土科学討論会講演要旨集(Web), 2018
  2018 - 2018
• Vertical Variations and Mobility of Heavy Metals in Sediment of Oto, Saitama　　　　　　　　　　　　　　　
  RAZAK Artini Abd; HOSSAIN Sushmita; ISHIYAMA Takashi; ISHIYAMA Takashi; HACHINOHE Shoichi; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2018
  2018 - 2018
• Leaching behavior of heavy metal from subsurface sediment of variable depositional environment in Central Kanto Plain, Japan　　　　　　　　　　　　　　　
  HOSSAIN Sushmita; ISHIYAMA Takashi; HACHINOHE Soichi; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2018
  2018 - 2018
• Relationships between weathering types and environmental condition - examples of caves and underground sites.　　　　　　　　　　　　　　　
  OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2018
  2018 - 2018
• How to increase visitor attraction to geoheritage　　　　　　　　　　　　　　　
  OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2018
  2018 - 2018
• Some morphological features of slope failures in granitic areas and property analyses considering rock weathering and soil formation　　　　　　　　　　　　　　　
  IMAM Md Hasan; WAKATSUKI Tsuyoshi; OGUCHI Chiaki T.; UEDA Mariko
  日本地球惑星科学連合大会予稿集(Web), 2018
  2018 - 2018
• Processes of structural deterioration of an abandoned old concrete bridge in Kozushima Island, facing the Pacific Ocean　　　　　　　　　　　　　　　
  KAKEI Shota; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2017
  2017 - 2017
• Quantitative relationships between salt-weathering of tuff and microclimatic environments, in the Yoshimi Hyaku-Ana historic site, Japan　　　　　　　　　　　　　　　
  ARIGA Natsuki; AOKI Hisashi; OGUCHI Chiaki T.; HAYAKAWA Yuichi S.
  日本地球惑星科学連合大会予稿集(Web), 2017
  2017 - 2017
• Influence of micro climatic conditions on salt weathering　　　　　　　　　　　　　　　
  SHARMA Santoshi Thakur; OGUCHI Chiaki T.; ARIGA Natsuki; AOKI Hisashi; HAYAKAWA Yuichi S.
  日本地球惑星科学連合大会予稿集(Web), 2017
  2017 - 2017
• The influence of weathering on landslides in some granitic areas of Japan　　　　　　　　　　　　　　　
  IMAM Md Hasan; WAKATSUKI Tsuyoshi; OGUCHI Chiaki T.; UEDA Mariko
  日本地球惑星科学連合大会予稿集(Web), 2017
  2017 - 2017
• Chemical and mineralogical properties of backfilling soils of Yokosuka Dry Dock, Kanagawa, Japan　　　　　　　　　　　　　　　
  OGUCHI Chiaki T.; SHOGAKI Takaharu; NAKAGAWARA Yuta; FUJII Yukiyasu
  日本地球惑星科学連合大会予稿集(Web), 2017
  2017 - 2017
• An experimental study for evaluating weathering susceptibility of cave sediments with relief structure on the wall　　　　　　　　　　　　　　　
  SAKANE Kaisei; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2017
  2017 - 2017
• Background of assessing geological materials for a potential low and intermediate level radioactive waste repository in Bangladesh　　　　　　　　　　　　　　　
  RAJIB Mohammad; OGUCHI Chiaki T.; RASUL Md. Golam; KUMAR MAJUMDER Ratan; KHALIL Md. Ibrahim; KABIR Mohammad Zafrul; DEEBA Farah; MONIRUZZAMAN Md.
  日本地球惑星科学連合大会予稿集(Web), 2017
  2017 - 2017
• Designing evacuation drills using GIS-based disaster prevention maps of cultural properties for Hanno City, Saitama Prefecture　　　　　　　　　　　　　　　
  SHIMIZU Kisara; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2017
  2017 - 2017
• Close-range remote sensing for monitoring the weathering in wall surfaces of a historical building at Orval Abbey, Belgium　　　　　　　　　　　　　　　
  HAYAKAWA Yuichi S.; OGUCHI Chiaki T.; THOMACHOT-SCHNEIDER Celine Elise; VAZQUEZ Patricia; GIBEAUX Soizic
  日本地球惑星科学連合大会予稿集(Web), 2017
  2017 - 2017
• Study in Spatial Distribution of Sediment Strength in Omiya and north Musashino Uplands　　　　　　　　　　　　　　　
  SHITARA Daishi; OGUCHI Chiaki T.; HACHINOHE Shoichi; IMAM Hasan Md.
  日本地球惑星科学連合大会予稿集(Web), 2016
  2016 - 2016
• Comparison of sorption coefficients between powder and intact solid phase: Case study with ¹³³Cs and ⁸⁷Sr on pumice tuff　　　　　　　　　　　　　　　
  RAJIB Mohammad; RAJIB Mohammad; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2016
  2016 - 2016
• Spatial pattern analysis of wall surface modification by weathering in Yoshimi-Hyakuana cave using terrestrial laser scanning　　　　　　　　　　　　　　　
  HAYAKAWA Yuichi S.; OGUCHI Chiaki T.; AOKI Hisashi; ARIGA Natsuki
  日本地球惑星科学連合大会予稿集(Web), 2016
  2016 - 2016
• Potentiality of geomorphological prospecting for economic minerals in fluvial environments of Bangladesh　　　　　　　　　　　　　　　
  RAJIB Mohammad; MONIRUZZAMAN Md.; OGUCHI Chiaki T.
  地形, 2015
  2015 - 2015
• Assessment of weathering grades for different chemical and geomechanical properties; A Sri Lankan case study　　　　　　　　　　　　　　　
  UDAGEDARA Dashan T.; UDAGEDARA Dashan T.; OGUCHI Chiaki T.; GUNATILAKE Jagath K.
  日本地球惑星科学連合大会予稿集(Web), 2015
  2015 - 2015
• Accumulation of radioactivity inside Yoshimi archeological heritage　　　　　　　　　　　　　　　
  RAJIB Mohammad; KODAMA Shogo; SONG Wonsuh; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2015
  2015 - 2015
• Arsenic contained in the pore water of the natural sediments in the northern part of the Nakagawa Lowland, Japan　　　　　　　　　　　　　　　
  HACHINOHE Shoichi; HOSSAIN Sushmita; ISHIYAMA Takashi; HAMAMOTO Hideki; OGUCHI Chiaki T.
  日本地球惑星科学連合大会予稿集(Web), 2015
  2015 - 2015
• Cesium adsorption on redox zone pumice tuff at different geochemical condition　　　　　　　　　　　　　　　
  RAJIB Mohammad; RAJIB Mohammad; OGUCHI Chiaki T.; SASAKI Takayuki; KOBAYASHI Taishi
  日本地球惑星科学連合大会予稿集(Web), 2015
  2015 - 2015
• Measurement of changes in wall surface morphology in Yoshimi-Hyakuana cave by terrestrial laser scanning　　　　　　　　　　　　　　　
  HAYAKAWA Yuichi S.; OGUCHI Chiaki T.; ARIGA Natsuki; AOKI Hisashi
  日本地球惑星科学連合大会予稿集(Web), 2015
  2015 - 2015
• Occurrence of heavy metals in alluvial sediments in northern part of Arakawa lowland, central Japan　　　　　　　　　　　　　　　
  KUMARI K. G. I. D.; OGUCHI Chiaki T.; HACHINOHE Shoichi; ISHIYAMA Takashi
  地形, 2010
  2010 - 2010
• P28. Seasonal changes in salt efflorescence and exfoliation of the wall in the Yoshimi Hyaku-Ana Historic Site(Meeting of the Union in October 2009)　　　　　　　　　　　　　　　
  OGUCHI Chiaki T.; YAMAZAKI Mai; TAKAYA Yasuhiko; AYE Thidar; HATTA Tamao
  2010
  2010 - 2010, Japanese
• P54 海水によるモルタルの表面変質に関する実験的研究(ポスター討論)　　　　　　　　　　　　　　　
  高屋 康彦; 中山 丈士; 小口 千明; 八田 珠郎
  Sep. 2008
  Sep. 2008 - Sep. 2008, Japanese
• Laboratory Experiments on Bacterial Weathering of Granite and Its Constituent Minerals　　　　　　　　　　　　　　　
  SONG Wonsuh; OGAWA Naoto; OGUCHI Chiaki T.; HATTA Tamao; MATSUKURA Yukinori
  地形, 2008
  2008 - 2008
• Experimental study on surface alteration of limestone and mortar attacked by seawater　　　　　　　　　　　　　　　
  2008
• Coal Characterization and the predicted environmental influence due to mining on Tavantolgoi Coal Mine in Mongolia.　　　　　　　　　　　　　　　
  2008
• 海水によるモルタルの表面変質に関する実験的研究　　　　　　　　　　　　　　　
  2008
• 海水によるモルタルの表面変質に関する一実験　　　　　　　　　　　　　　　
  2008
  Poster presentation
• 史跡吉見百穴の温湿度環境に伴う塩類風化に関する研究　　　　　　　　　　　　　　　
  2008
  Poster presentation
• GIS による基礎調査と含有鉱物調査からみたモンゴル・タバントルゴイ炭鉱開発に伴う環境劣化予測　　　　　　　　　　　　　　　
  2008
  Poster presentation
• Is sodium sulfate always the most effective salt in destroying any type of rock?　　　　　　　　　　　　　　　
  2008
• Study in salt weathering on concrete: field observation and experiment　　　　　　　　　　　　　　　
  2008
• Experimental study on surface alteration of limestone and mortar attacked by seawater　　　　　　　　　　　　　　　
  iSEM2008 (CD-rom), 2008
• Coal Characterization and the predicted environmental influence due to mining on Tavantolgoi Coal Mine in Mongolia.　　　　　　　　　　　　　　　
  iSEM2008 (CD-rom), 2008
• 海水によるモルタルの表面変質に関する実験的研究　　　　　　　　　　　　　　　
  2008年第52回粘土科学討論会稿集 (CD-rom), 2008
• 海水によるモルタルの表面変質に関する一実験　　　　　　　　　　　　　　　
  JpGU2008 (CD-rom), 2008
  Poster presentation
• 史跡吉見百穴の温湿度環境に伴う塩類風化に関する研究　　　　　　　　　　　　　　　
  JpGU2008 (CD-rom), 2008
  Poster presentation
• GIS による基礎調査と含有鉱物調査からみたモンゴル・タバントルゴイ炭鉱開発に伴う環境劣化予測　　　　　　　　　　　　　　　
  JpGU2008 (CD-rom), 2008
  Poster presentation
• Is sodium sulfate always the most effective salt in destroying any type of rock?　　　　　　　　　　　　　　　
  EGU2008 (CD-rom), 2008
• Study in salt weathering on concrete: field observation and experiment　　　　　　　　　　　　　　　
  EGU2008 (CD-rom), 2008
• Influence of Rock Properties on Salt Weathering of Oya-tuff　　　　　　　　　　　　　　　
  YUASA Hayato; OGUCHI Chiaki T.
  Mar. 2006
  Mar. 2006 - Mar. 2006, Japanese
• Flood disaster as seen from paleoflood research by geomorphologists(Abstracts of Papers Presented at the Fall Meeting of the Union, October 2005)　　　　　　　　　　　　　　　
  OGUCHI Takashi; HORI Kazuaki; AOKI Tatsuto; OGUCHI Chiaki
  2006
  2006 - 2006, Japanese
• Estimation of erosion rates on lava domes using 3D-photo measurement system Kuraves-K(Abstracts of Papers Presented at the Spring Meeting of the Union, April 2006)　　　　　　　　　　　　　　　
  KATO Shuhei; OGUCHI Chiaki T.; OGUCHI Takashi
  2006
  2006 - 2006, Japanese
• Study on salt weathering of concrete structure(Abstracts of Papers Presented at the Spring Meeting of the Union, April 2006)　　　　　　　　　　　　　　　
  YAMADA Tetsuo; OGUCHI Chiaki T.
  2006
  2006 - 2006, Japanese
• 18. Effects of bacteria Bacillus subtilis on the weathering of granite : A laboratory experiment(Abstracts of Papers Presented at the Spring Meeting of the Union, May 2005)　　　　　　　　　　　　　　　
  SONG Wonsuh; OGAWA Naoto; OGUCHI Chiaki; HATTA Tamao; MATSUKURA Yukinori
  2005
  2005 - 2005, Japanese
• An Experiment on Salt Efflorescence Mechanism for Sustainable Agriculture in Arid Rigions　　　　　　　　　　　　　　　
  OGUCHI Chiaki T.; HATTA Tamao; NEMOTO Seiko
  Oct. 2003
  Oct. 2003 - Oct. 2003, Japanese
• An Experimental Study on Salt Efflorescence Mechanism for Development of Sustainable Agriculture　　　　　　　　　　　　　　　
  OGUCHI Chiaki T.; HATTA Tamao; NEMOTO Seiko
  Mar. 2003
  Mar. 2003 - Mar. 2003, Japanese
• River terraces and fluvial deposits along the Khabur River, Northeast Syria(Papers Presented at the Spring Meeting of the Union, May, 2003)　　　　　　　　　　　　　　　
  OGUCHI Takashi; HORI Kazuaki; OGUCHI Chiaki; NISHIAKI Yoshihiro
  2003
  2003 - 2003, Japanese

• Japan Geosciences Union
• Japanese Society of Soil Science amd Plant Nutrition
• Speleological Society of Japan
• The Volcanological Society of Japan
• The Clay Science Society of Japan
• The Association of Japanese Geographers
• The Japanese Geotechnical Society
• Japan Geomorphological Union
• British Geomorphological Research Group
• European Geosciences Union

• 歴史的人類遺産に使用された石材の物性の研究　　　　　　　　　　　　　　　
  2009 - 2011
  Competitive research funding
• Rock poperties of the stone resources used in historical monuments.　　　　　　　　　　　　　　　
  Grant-in-Aid for Scientific Research, 2009 - 2011
  Competitive research funding
• 岩石土壌材料における塩害に関する研究　　　　　　　　　　　　　　　
  2006 - 2008
  Competitive research funding
• Salt hazards on rocks and soils　　　　　　　　　　　　　　　
  Grant-in-Aid for Scientific Research, 2006 - 2008
  Competitive research funding
• 長期間の岩石物性変化としての風化速度　　　　　　　　　　　　　　　
  Competitive research funding
• 水-岩石相互作用からみた地盤汚染・地下水汚染　　　　　　　　　　　　　　　
  Competitive research funding
• 塩類風化における岩石物性の影響　　　　　　　　　　　　　　　
  Competitive research funding
• 地圏材料の風化に関する研究　　　　　　　　　　　　　　　
  Competitive research funding
• Long-term weathering rates as changes in rock properties　　　　　　　　　　　　　　　
  Ordinary Research
  Competitive research funding
• Water-rock interaction and pollutions of sediments and groundwater　　　　　　　　　　　　　　　
  Ordinary Research
  Competitive research funding
• Salt weathering　　　　　　　　　　　　　　　
  Ordinary Research
  Competitive research funding
• Rock weathering of geosphere materials　　　　　　　　　　　　　　　
  Ordinary Research
  Competitive research funding