| Project/Area Number |
10680095
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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 | HOKKAIDO UNVERSITY |
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Principal Investigator |
HIRAKAWA Kazuomi Hokkaido Univ., Grad. School of Env. Earth Sci., Prof., 大学院・地球環境科学研究科, 教授 (40126652)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAGATA Kotaro Jouetu Univ. Edu. Inst., 学校教育学部, 助手 (80239855)
KURASHIGE Yoshimasa Shiga Pref. Univ. Fac. of Env. Asso. Prof., 環境科学部, 助教授 (20241383)
WATANABE Teiji Hokkaido Univ., Grad. School of Env. Earth Sci., Asso. Prof., 大学院・地球環境科学研究科, 助教授 (40240501)
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| Project Period (FY) |
1998 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2001: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1998: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Keywords | Hidaka Mountains / Tokachi Plain / Permafrost / Tephra / Glaciation / 水分環境 / 古水文環境 |
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| Research Abstract |
1. On the basis of tephrochronology, sedimentation and downcutting by rivers are examined in some rivers of Tokachi Plain and Hidaka Mountains, particularly for the Oxygen Isotope Stage 5〜3.
2. Eolian dust had been produced and transported from the bare ground of Hidaka Mountains to Tokachi Plain during the Last Glacial, indicating the tundra environment of the Mountains.
3. Paleohydrological study of fluvial gravels reveals that the discharge of rivers during the Last Glacial should have been almost same as that of at present. This result indicates that a sedimentation during the Last Glacial had been resulted from the abundant supply of load.
4. Mountain permafrost was examined by the indicative landform of rockglacier and the present climatic condition obtained from own observation. Permafrost is possibly distributed at present in the summit area of the Hidaka Mountains around Mt. Poroshiri.
5. Fossil periglacial phenomena in the Tokachi plain was examined with special reference to permafrost condition of the Last Glacial. Past climate was examined in relation to summer temperature.
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