| Project/Area Number |
08456118
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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 |
Irrigation, drainage and rural engineering/Rural planning
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| Research Institution | Shimane University |
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Principal Investigator |
FUKUSHIMA Akira Shimane University・Faculty of Life and Environment, Professor, 生物資源科学部, 教授 (90027251)
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| Co-Investigator(Kenkyū-buntansha) |
MORI Yasushi Shimane University・Faculty of Life and Environment, Assistant Professor, 生物資源科学部, 助手 (80252899)
IKUO Takeda Shimane University・Faculty of Life and Environment, Associate Professor, 生物資源科学部, 助教授 (60227022)
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| Project Period (FY) |
1996 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | flood runoff analysis / runoff model / hydrological cycle / paddy filed watershed / circular irrigation / image processing / rain water percolation / macropore / 循環灌漑 / 森林土壌 / 可視化 |
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| Research Abstract |
The study purposes to provide an application of topographic information in watershed to the forecast of runoff through the computer workstation. Especially, a discussion is developed on setting the viewpoint at moutainous rural area in San-in district. The results are as follows : 1.(1) Modified runoff models based on the long and short term runoff model or the lumped KiWS model were proposed for the analysis considering the effect of basin topography and distribution of impermeable area. (2) Runoff calculation system was constructed, by using UNIX workstation, to cany out a series of analysis including data input ; runoff analysis ; and output of hydrographs. 2. (1) The behavior of hydrological water balance and mass balance of pollutant were mesured in a paddy field watershed, where a circular irrigation system is implemented. The contribution of the water drawn from extra area and circulation, the mass balance of pollutants and sediment to the improvement of river basin environment was considered. (2) The hydrological properties were evaluated in the experimental lysimeters. As a result, the amount of percolation water amounted for 60% of precipitation and the surface runoff occurred after the cumulated precipitation reached a certain degree. 3. (1) Soft X-ray radiography of water flow in undisturbed paddy soils, upland field soils and forest soils were carried out. Vertical, independent root channels in paddy soils and networked root channels in upland fields conduct the water flow, On the other hand, interaggregate macropore flow has been observed in forest soils. Resultant Reynolds number for paddy field and upland field soils showed 50-80, which indicated macropore flow was in a transition region from laminar to turbulent.
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