A Study of Mountain-side Denudation due to Flow Down of Landslide Soil

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  • 崩壊土砂の流下による山腹面の荒廃に関する研究
  • ホウカイ ドシャ ノ リュウカ ニ ヨル サンプクメン ノ コウハイ ニ カンスル ケンキュウ

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Abstract

In July 1972, a heavy storm which brought 300 mm total rainfall in the north west region of Aichi Prefecture caused many landslides. The mud and debris flow by the landslide brought about severe disasters.<br> This disastered area was investigated through the airphotograph, and the results were summarized as follows:<br> (1) The mud and debris flow originated from landslides of mountainsides caused erosions, with development of small channels due to flow down of landslides' soil. The growth of the stream system reflected the difference of the geological structure.<br> (2) The number of erosions was less than the number of landslides, but the total area of erosions was nearly equal to landslide's.<br> (3) Erosions occurred mostly in the first order stream. (4) The distribution of landslide sizes followed the law of Poisson. The size of erosion was calculated in terms of area which would be caused by 0.01 ha. of landslide. The distribution of these erosion sizes indicated the same tendency as in the case of landslide.

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