| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2009: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2008: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2007: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Research Abstract |
In order to evaluate soil reinforcement by tree root system in wide area, we applied a distributed shallow landslide model to Utsunmoiya University forest at Funyu. Total area is 530ha, and 320ha is a artificial forest of Hinoki Cypress, where the shallow landslides occurred by the heavy rainfall at the end of August 1998. The area frequency distribution to stand age was shifted to young stand age. We carried out the back calculation based on the relation between the actual area of shallow landslides and stand age with distributed shallow landslides model. Result of back calculation was showed as the relation between stand age and soil cohesion and the range of soil cohesion (including root system) was approximately between 5.3 to 7.6kPa, and the minimum value at 20 years stand age.
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