2001 Fiscal Year Final Research Report Summary
The role of bedrock groundwater on runoff and landslide initiation
| Project/Area Number |
11660146
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
林学
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| Research Institution | University of Tsukuba |
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Principal Investigator |
ONDA Yuichi University of Tsukuba, Insitute of Ggoscience, Lecturer, 地球科学系, 講師 (00221862)
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| Co-Investigator(Kenkyū-buntansha) |
TAKENAKA Chisato Nagoya Univerity, Dept.of Bioagricultural Sciences, Professor, 大学院・生命農学研究科, 教授 (40240808)
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| Project Period (FY) |
1999 – 2001
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| Keywords | hillslope hydrology / groundwater flow / landslide / shale / granite / steep landform / delayed runoff peak / bedrock groundwater |
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| Research Abstract |
To examine runoff generation processes in very steep terrain underlain by relatively unweathered granite and shale, several small watersheds were monitored ; two are in shale and two are in granite in Ina, two are in Shale in Kanuma, central Japan. The shale catchments had distinctly different runoff responses to the same storm event, whereas the two granite catchments had similar runoff response ; high peak runoff coincides with rainfall peak. Most of the storm runoff water is defined as 'old water', in shale basins, and more than half in the granite basin. Soil water percolated vertically downward into bedrock even during storm event in shale watershed, whereas subsurface storm flow parallel to slope is observed in granite watersheds. These data suggest that subsurface storm flow is dominant even in very steep mountains, and subsurface flow through soil mantle is dominant in granite basins, whereas bedrock flow is dominant in shale basins.
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[Publications] Kato,Y., Onda,Y, Mizuyama,T., Kosugi,K., Yoshikawa,I., Tsujimura,M., Hata,K., Okamoto,M.: "The difference of runoff peak response time in upstream of Ibi River underlain by different geology"Journal of the Japan Society of Erosion Control Engineering. 53,4. 38-43 (2000)
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「研究成果報告書概要(欧文)」より
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[Publications] Tsujimura,M., Onda,Y., Komatsu,Y., Shimizu,T., Matsumura,K., Hattori,S., Nakagawa,Y., Matsui,T.: "Runoff and Chemical Characteristics in Stream Water of Hilly Weadwater Basins Underlain by Gravel and Weathered Granite"J, Japan Soc. Hydrol.& Water Resour. 14,3. 229-238 (2001)
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「研究成果報告書概要(欧文)」より
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