Freeze-Thaw Activities and Rock Breakdown in the Langtang Valley, Nepal Himalaya
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概要
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Measurement of rock breakdown from outcropping cliffs and observation of air and rock surface temperatures gave preliminary insight into the altitudinal variation in magnitude of frost shattering in the Langtang Valley, Nepal Himalaya. Rock breakdown occurred in 9 painted quadrangles among the 22 quadrangles established at 5 measurement sites, and the maximum shattering rate was found at the altitudes between 4100 m and 4700 m. The rock surface temperature on the south-facing slope at 5110 m a.s.l. fluctuated between -2℃ and 2℃, i.e., the effective freeze-thaw cycle (EFTC), at least 190 times in 1989, but only 62 times on the north-facing slope (5090 m a.s.l.). The altitudinal variation in magnitude of the estimated annual number of EFTC events, computed from the temperature data obtained at two meteorological sites, suggests that the frost shattering should be most active at 5600 m on the south-facing slope and 6200 m on the north-facing slope. The inconsistency between measurement and estimation of the altitude of maximum frost shattering may be attributed to various properties of the rocks in the study area.
- 北海道大学の論文
- 1992-12-21
著者
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Shiraiwa Takayuki
Institute of Low Temperature Science, Hokkaido University
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Shiraiwa T
Hokkaido Univ. Sapporo Jpn
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Shiraiwa Takayuki
Institute Of Low Temperature Science Hokkaido University
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