2016 Fiscal Year Final Research Report
Hydrological study on behavior of rainwater in forest slopes to improve analysis accuracy of collapse prediction method
| Project/Area Number |
25350504
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Natural disaster / Disaster prevention science
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| Research Institution | Shinshu University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Keywords | 樹木根系 / 根系流 / 斜面崩壊 / マトリックス流 / バイパス |
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| Outline of Final Research Achievements |
Hydrological properties of soil layer are determined by various kinds of heterogeneities, and these heterogeneities give large influences to hydrological processes in the soil layer. This study focused on the common and abundant forest roots, infiltration experiment using a pseudo roots and local hydrological observation was carried out. As a result, the presence of forest roots significantly affects behavior of rainwater in soil layer , such as, reduced the startup time of groundwater runoff and increased the amount of groundwater runoff. In addition, the startup time of groundwater runoff and the amount of groundwater runoff were able to approximate by using circumferential length of pseudo roots and sprinkling intensity. In the region of metamorphic sandstone, runoff along tree roots was greater near the boundary surface. However, in the weathered granite region, high permeability zone extended to the deep soil layers and runoff due to the presence of roots was high at all depths.
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| Free Research Field |
砂防学
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