Geomorphic Dynamics and Sediment Budget in the Southern Japanese Alps: Recent Studies and Prospects
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- MATSUOKA Norikazu
- Faculty of Life and Environmental Sciences, University of Tsukuba
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- IMAIZUMI Fumitoshi
- Faculty of Agriculture, Shizuoka University
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- NISHII Ryoko
- Faculty of Life and Environmental Sciences (Ikawa University Forest), University of Tsukuba
Bibliographic Information
- Other Title
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- 南アルプスにおける地形変動と土砂収支
- 南アルプスにおける地形変動と土砂収支 : 最近の研究動向と展望
- ミナミアルプス ニ オケル チケイ ヘンドウ ト ドシャ シュウシ : サイキン ノ ケンキュウ ドウコウ ト テンボウ
- ―最近の研究動向と展望―
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Abstract
This review paper synthesizes geomorphic dynamics, sediment transport and resulting natural hazards in mountains of the southern Japanese Alps and their drainage basins, where climatic and geological situations produce highly active landform dynamics. In alpine areas above the timber line, shallow diurnal freeze-thaw action operating in the thin topsoil produces small-scale periglacial forms, and gravitational spreading leads to numerous sackung features where snow-melt and heavy rain in places promote rockslides. In subalpine and montane areas, deep-seated landslides originate from fractured sedimentary rocks, deep V-shaped valleys, and heavy rain, while shallow landslides continue with historical forest clearance. Continuous slope failures prevent vegetation recovery and maintain debris input to valleys. Steep valleys contribute to high-density debris flows. Frequent or repetitive occurrences of these mass movements promote continuous denudation of slopes, rockfall accidents along hiking trails, and sedimentation at artificial dams. They occasionally cause significant hazards to villages further downstream. Predicting and mitigating slope hazards require distinguishing among annual, low-magnitude processes, episodic high-magnitude processes and geomorphic changes associated with long-term climate change.
Journal
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- Journal of Geography (Chigaku Zasshi)
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Journal of Geography (Chigaku Zasshi) 122 (4), 591-614, 2013
Tokyo Geographical Society
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Details 詳細情報について
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- CRID
- 1390282679214828544
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- NII Article ID
- 130003373658
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- NII Book ID
- AN00322536
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- ISSN
- 18840884
- 0022135X
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- NDL BIB ID
- 024871841
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed