| Project/Area Number |
62460234
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
自然地理学
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| Research Institution | Hokkaido Universty |
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Principal Investigator |
FUKUDA Masami Institute of Low Temperature Science, Hokkaido Univ., 低温科学研究所, 助教授 (70002160)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMIZU Osamu Dept. of Forestry, Division of Agr., Hokkaido Univ., 農学部, 助手 (20178966)
SAITOH Kyoji Dept. of Geography, Hokkaigakuen Univ., 教養部, 助教授 (60170495)
IWASAKI Kazutaka Dept. of Geography, Division of Leterature, Hokkaido Univ., 文学部, 講師 (90176537)
YAMAMOTO Hiroshi Institute of Environmental Science, Hokkaido Univ., 大学院環境科学研究科, 助手 (70110632)
ONO Yugo Institute of Environmental Science, Hokkaido Univ., 大学院環境科学研究科, 教授 (70091890)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1988: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1987: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Permafrost / Ground ice / Plasa / Soil wedge / Frost crack / Active layer / 大雪山 / 不連続的永久凍土分布 / 構造土 / 崖錐性斜面 / 風穴 / 活動層 / 凍結深さ |
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| Research Abstract |
Intensive field investigations on permafrost occurrence in Mt. Taisetsu were conducted by members of this project. Boring cores were taken from the frozen ground. Using bored holes temperature profiles of the ground were also measured for whole year round with newly developed devices. Continuous monitoring of temperature profiles gives mean annual temperature gradients in soil layers. The extra-polation of temperature gradient to the frozen layers indicates that the permafrost table is located at 550cm depth. Active frost cracks on the ground surface were observed on the flat summits. The increase of the width of frost cracks were recorded as 1cm in one winter. The palsas were formed at the area where considerable depth of peat was deposited.
The existence of ground ice-body was reported by field survey around Mt. Taisetsu. The genesis of ice-body may related with the large scale land slides at early Holocene.
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