| Project/Area Number |
07680187
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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 |
自然地理学
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| Research Institution | KOCHI UNIVERSITY |
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Principal Investigator |
EGUCHI Takashi KOCHI UNIVERSITY,FACULTY OF HUMANITIES AND ECONOMICS,ASSOCIATE PROFESSOR, 人文学部, 助教授 (30263966)
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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 |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1996: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1995: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | Bhutan Himalaya / Monsoon / Intraseasonal variation / Mountain and valley circulation / Precipitation intensity / Heavy rain / Cyclone / 降水量 / 気流系 / 降水の年変化 / 降水量強度 / モンスーン循環 / 山谷風循環 |
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| Research Abstract |
The purpose of this study is to clarify the regional characteristics of intraseasonal variation in precipitation in the eastern part of the Himalayas and its relationship with the Indian summer monsoon. The daily precipitation is analyzed mainly in the Bhutan Himalaya and the results are as follows ;
1.The difference in precipitation between the southern foothills and the intramontane basin in the Bhutan Himalaya depends mainly on the intensity of daily precipitation, and the difference in the intensity of precipitation is considered to be related to two air circulation systems with a different spatial scale. One is the monsoon circulation system on a synoptic scale and the other is the mountain and valley circulation system on a local scale.
2.The precipitation in the Bhutan and Nepal Himalayas is considered to increase (decrease) during the break (active) phase of the Indian summer monsoon in June and July. However, from mid August, the relationship between precipitation in the Bhutan and Nepal Himalayas and the activity of summer monsoon is not clear.
3.The cause of heavy rains in 1989 is the cyclones passing near the Bhutan Himalaya around 18th May and 15th June. The cyclone brings relatively widespread heavy rains in the Bhutan Himalaya and, in the intramontane basin, they have much precipitation.
Based on above results, it is shown that the relationship between the activity of Indian summer monsoon and the precipitation in the Himalayas changes from July to August. Moreover, it should be careful of the damages caused by the cyclone, especially in the intramontane basin of the Bhutan Himalaya.
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