| Project/Area Number |
07456072
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | KYOTO UNIVERSITY |
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Principal Investigator |
KANZAKI Kouichi Kyoto University, Dept.of Forestry, Professor, 農学部, 教授 (20026404)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIMURA Tetsuhi Kyoto University, Dept.of Forestry, Instructor, 農学部, 助手 (40252499)
SUZUKI Yasushi Kochi University, Dept.of Forestry, Associate Professor, 農学部, 助教授 (20216451)
NUMATA Kunihiko Kyoto University, Dept.of Forestry, Asiociate Professor, 農学部, 助教授 (30026405)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 1996: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1995: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | forest road network / runoff ratio / cut slope / pavement / tank model / simmlation / forest road / drainage |
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| Research Abstract |
In this study, we proved the effect of paved roads on drainage for a forest road network in order to maintain forest lands properly.
The result of the observation of runoff from cut slopes showed that average runoff ratios from cut slopes were 5.46% in 1995 and 8.30% in 1996. According to the result of multiple regression analysis, the runoff ratios depended highly on maximum rainfall intensity in one hour. The partial regression coefficient of antecedent precipitation was also significant and the runoff ratio was higher when there was antecedent precipitation. The runoff of interflow was rather irregular and there was very little runoff in 1996. In addition, the average runoff of overland flow ratio was 0.045% in 1996 and it was also very little..
On the other hand, the runoff ratio from the surface of a forest road was 20%-50% and the average was 39.4%. Compared with the runoff ratio from cut slopes, that from the surface of a forest road was found to be higher.
We made a tank model of runoff in a forest land and analyzed the amount of outflow runoff with that model. As a result, the surface of forest road was highly dependent upon whether road surface was paved or not. Compared with pavement, the effect of a side channel on drainage of a forest road was smaller. Finally, it was found that pavement was effective when rainfall on the road was drained by using the road surface. On the other hand, a side channel was not necessary when the surface of a forest road was paved.
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