1996 Fiscal Year Final Research Report Summary
Comparative hydrological study on the interaction between runoff and the geographical development on volcanic mountains.
| Project/Area Number |
06304017
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 総合 |
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| Research Field |
林学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
KOBASHI Sumiji Kyoto University, Graduate School of Agriculture, Professor, 農学研究科, 教授 (40026604)
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| Co-Investigator(Kenkyū-buntansha) |
MARUTANI Tomomi Kyushuu University, Agriculture, Associate Professor, 農学部, 助教授 (40112320)
SUWA Hiroshi Kyoto University, Disaster Prevention Reseach Institute, Associate Professor, 防災研究所, 助教授 (00093253)
TSUCHIYA Satoru Shizuoka University, Agricultue, associate professor, 農学部, 教授 (60197720)
SHIMOKAWA Eturou Kagoshima University, Agriculture, Professor, 農学部, 教授 (60041670)
OHTA Takeshi Iwate University, Agriculture, Associate Professor, 農学部, 助教授 (20152142)
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| Project Period (FY) |
1994 – 1996
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| Keywords | Activity of volcano / Disaster of sediment / Runoff / geographical development |
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| Research Abstract |
Sediment disasters due to volcanic activities are serious problems in countries which lie along the Pacific-rim volcanic zone including not only Japan, but also South-East Asian, South American, and North American countries. Volcanic sediment disasters are unique and different in nature from ordinary sediment disasters which occur in highlands. Huge quantity of eruptive volcanic sediment are suddenly acumulates near the summit of volcano, and runoff frequently breaks up the accumulated eruptive sediment to generate debris flow. These debris flows are very likely to destroy the villages in the alluvial fan bringing about serious damage and personal injuries. The eruptive sediment covering the surface of the summit and slopes of a volcano abruptly reduce the infiltration capability of ground, and as a consequence brings about an increase in surface runoff.
The purpose of this study is to clearify the characteristics of sediment movement in volcanic mountain regions. From the results of investigations on Merapi in Indonesia, and Unzen-Fugen and Mt.Bandai of Japan, the characteristics of runoff and the condition of geographical development have become clear. These phenomena are considered as interactions and are analyzed by means of comparative hydrology. The complexity of sediment disasters due to volcanic activities is shown in abrupt change of runoff. Acording as the development of gully erosion, quantity of runoff decreases.
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