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485 results on '"Sidle, Roy C"'

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Author

TSUTSUMI, Daizo, FUJITA, Masaharu, SIDLE, Roy C., HAYASHI, Yujirou, 40372552, 60181369, TSUTSUMI, Daizo, FUJITA, Masaharu, SIDLE, Roy C., HAYASHI, Yujirou, 40372552, and 60181369

Abstract

Numerical experiments were conducted to assess the effect of preferential flow through pipes and cracks within weathered bedrock on slope stability, using hydrological model in which water flows within both the matrix and macropores. The hillslope consists of soil and weathered bedrock layers. Hydraulic properties were assigned to the weathered bedrock as well as the soil layer, and the regolith flow calculations were conducted within the slopes. Results demonstrated that the preferential flow pathway rapidly transported rainwater to the deeper layer of the slope, and if the outlets of the preferential flow pathway remained within the slope, the pressure head increased around these points. This increase in pressure head caused a decrease in the factor of safety at the deeper layer of the slope.

Published
2005

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Author

TSUTSUMI, Daizo, SIDLE, Roy C., FUJITA, Masaharu, KOSUGI, Ken'ichiro, 40372552, 60181369, 30263130, TSUTSUMI, Daizo, SIDLE, Roy C., FUJITA, Masaharu, KOSUGI, Ken'ichiro, 40372552, 60181369, and 30263130

Abstract

A general modeling method describing the three-dimensional lateral preferential water flow in ahillslope with soil pipes was developed. Matrix flow and pipe flow were regarded as the separated flow systems，and calculated by their respective governing equations (Richards' and Manning's equations，respectively)considering the interaction between these two flow systems. The model accommodates both partially and filledpipeflow，and seepage into the pipe as well as backflow from the pipe to the surrounding soil matrix. Simulationswere conducted for conditions outlined in an earlier bench-scale experiment. Both groundwater levels andpreferential flow that were influenced by the location of a high roughness element within the soil pipe wereaccurately simulated; other models have not simulated such conditions.

Published
2004

157. Geo-disaster Prediction and Geo-hazard Mapping in Urban and Surrounding Areas

Author

Sidle, R.C, IAI, Susumu, INAZUMI, Shinya, CHIGIRA, Masahiro, KAMAI, Toshitaka, SIDLE, Roy C., MIMURA, Mamoru, SUWA, Hiroshi, SAITO, Takashi, TOBITA, Tetsuo, Sidle, R.C, IAI, Susumu, INAZUMI, Shinya, CHIGIRA, Masahiro, KAMAI, Toshitaka, SIDLE, Roy C., MIMURA, Mamoru, SUWA, Hiroshi, SAITO, Takashi, and TOBITA, Tetsuo

Abstract

Urban development rapidly expanding from lowland to surrounding hills and mountains poses increasing risks in geo-hazards, including liquefaction during earthquakes, and failure of artificial and natural slopes. Objective of this study is to develop methodologies for assessing vulnerability to these hazards, and technologies for improving the performance of geotechnical works in urban areas. This paper summarizes the results of the study with respect to (1) performance of retaining walls at waste fill in waterfront areas, (2) hazard mapping of natural slope failures through monitoring using laser scanners, and (3) hazard assessment of residential areas in valley fills and hills.

Published
2004

168. Factors Affecting Generation of Hortonian Overland Flow in Forested Hillslopes: Analysis of Observation Results at Three Sites with Different Geology and Rainfall Characteristics.

Author

Miyata, Shusuke, primary, Onda, Yuichi, additional, Gomi, Takashi, additional, Mizugaki, Shigeru, additional, Asai, Hiroaki, additional, Hirano, Tomonori, additional, Fukuyama, Taijiro, additional, Kosugi, Ken’ichirou, additional, Sidle, Roy C., additional, Terajima, Tomomi, additional, and Hiramatsu, Shinya, additional

Published
2009
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