| Project/Area Number |
06660292
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Irrigation, drainage and rural engineering/Rural planning
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| Research Institution | YAMGATA UNIVERSITY |
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Principal Investigator |
YOSHIDA Chikara FACULTY of AGRICULTURE.YAMAGATA UNIVERSITY, 農学部, 教授 (10007073)
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| Co-Investigator(Kenkyū-buntansha) |
KASUBUCHI Tatsuaki FACULTY of AGRICULTURE,YAMAGATA UNIVERSITY, 農学部, 教授 (00250960)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1995: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1994: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | low moor area / reuse of irrigation water / foundation transition / peat soil / consolidation / heavy metal pollution / 客土厚さ / 地下水の移動 |
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| Research Abstract |
This study has been done on the Yashirogo low moor area, which is located in the northeast of the Okitama plain in Yamagata prefecture. This area covers apporoximately 950 hectare, and the biggest depth of its peat deposits is apporoximately 9 meter. There is the apporoximately 5.3 hectare survival lake at the bottom of the deposits. This area has been mainly used as a paddy field, however, today there is a strong demand for a dry rice due to the rationalization of agriculture. Yet conservation of ill-drained paddy field and farm land consolidation often contradict each other.
In order to explore a possible solution, this study will examine following six points ; 1) the actual condition of the land subsidence of the Yashirogo low moor area, 2) the influences of reuse of irrigation water upon the area, 3) the transition of the size of the survival lake, 4) the relationship between the road quality, 6) acid-proof properties of structures in the peat moor. The followings are the summary of the results.
1) Avarage 70 centimeter of foundation transition is acknowledged. The main reason of this transition is the desappearance of the surface portion. 2) Compared to the case of Hokkaido, the transition is remarkablly small. The reason is because this area is geographically closed and reuse of irrigation water is going on within it. This water management contributes to slowing down the deminishment of the area of the survival lake. 3) The road pressure consolidates the peat soil. The consequence shows that hydraulic conductivity is reduced to from one tenth to one fifteenth of the usual level. 4) The heavy metal related pollution of peat soil and water pollution which have been pointed out turn out to be nothing serious. The oxidization of structures in the area hardly matters, either.
These results give a strong implication that conversation of ill-drained paddy field and development of surrounding areas can be achieved simultaneously.
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