1996 Fiscal Year Final Research Report Summary
STUDY ON FARM LAND CONSERVATION IN COLD REGIONS
| Project/Area Number |
06454103
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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 | OBIHIRO UNIVERSITY OF AGRICULTURE AND VETERINARY MEDICINE |
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Principal Investigator |
TSUCHIYA Fugio OBIHIRO UNI., PROFESSOR, 畜産学部, 教授 (30003130)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUDA Yutaka HOKKAIDO UNI., AGRICULTURE,PROFESSOR, 農学部, 教授 (50003083)
TSUJI Osamu OBIHIRO UNI., ASSOCIATE PROFESSOR, 畜産学部, 助教授 (60155364)
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| Project Period (FY) |
1994 – 1996
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| Keywords | SOIL EROSION / USLE / RAINFALL INDEX / SOIL FREEZING / SNOWMELT WATER |
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| Research Abstract |
Tokachi District in Hokkaido is considered as an extensive cold area which having less snow fall during theWinter. The frozen soil starts to thaw in early spring of which remaining soil layr behaves as an impermeable layr. Hence, the Soil Erosion influenced by water in Tokachi district is severe owing to both snow melt water and rainfall. This study was carried out in field investigations of Soil Erosion by employing an artificial Rainfall apparatus, a slant frame examination and to calculate a rainfall index for cultivated fields in Tokachi didtrict. The objectives of this study were ; (1) Estimation of Soil Erosion in cultivated field, (2) Investigation of Erosion mechanism in Frozen soil and (3) Erosion prediction. Finally, the major results obtained from the stydy are as follows.
The much Erosion damage was experienced in sloppy land than upland field while the Soil Erosion in cultivated field during snow melting period was realized. The Soil Erosion comparison was done between North and South directions.
Increase of freeze thaw with increasing the slope was examined during the experiment conducted to compare the effect of slope direction by using artificial rainfall apparatus. This relationship becomes intensely stronger when the increase of slope is sudden.
The conservation coefficient of rainfall Indexes are estimated as 10.2 at the North slope and 7.0 at the South slope with the slant erosion observation frame. Finally, these results concluded that the danger of Soil Erosion expeting snow melt is very high in Tokachi district where the temperature is greatly low and less snow fall exists with much deeper frozen soil in the Winter.
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