| Project/Area Number |
09660265
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Miyagi Agricultural College |
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Principal Investigator |
KATO Toru Miyagi Agricultural College, Agricultural Engineering, Professor, 農業土木科, 教授 (70070224)
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| Co-Investigator(Kenkyū-buntansha) |
KURASHIMA Eiichi Iwate University, Faculty of Agriculture, Assistant Professor, 農学部, 助教授 (30178082)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | global warming / rising of temperature / snowmelt runoff analysis / calculation of snowpack and snowmelt / change of snowmelt runoff / snowy district / 温暖化シナリオ / 総流出高 / 融雪流出高 / 融雪水依存度 / 融雪流出 / 流出解析 |
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| Research Abstract |
Our research deals with the forecast of the effect of global warming on snowmelt runoff in rivers of snowy district. The basins we select for our research are the Okura dam basin in Miyagi prefecture and Tori dam basin in Toyama prefecture.
We have discussed the effect from total runoff, snowmelt runoff, snowmelt season, and snow cover disappearance date that these two dams show, and have also established two scenario : Scenario I takes into consideration an increase in precipitation with the rise of temperature and Scenario II does not.
The summary of the results is shown below.
(1) The rise of temperature reduced the percentage of precipitation to snowfall and the water equivalent of snow. Moreover, the snowmelt season and the snow cover disappearance date came earlier. Therefore, we can see remarkably early snowmelt runoff and its decrease in volume.
(2) The depth of total runoff and snowmelt runoff decreased abundantly, with the rise of temperature in April and May, and, on the contrary, the depth increased a little in March and February.
(3) The depth of total runoff and snowmelt runoff showed a greater decrease in Scenario II than in Scenario I.
(4) There was not a significant difference between the Okura dam basin and the Tori in the percentage of decrease in total runoff and snowmelt runoff. On the other hand, the Tori dam basin showed a marked decrease in the depth of total runoff and snowmelt runoff : it had two to three times greater decrease than the other one.
(5) Thus, it can be predicted that global warming has a large effect on snowmelt runoff in river of the snowy district.
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