Soil Movement on the Cutting Slope of a Forest Road

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  • Morita Koichi
    Department of Forestry, Faculty of Agriculture, Kyushu University

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Other Title
  • 林道切取りのり面における土砂移動
  • リンドウ キリトリ ノリメン ニ オケル ドシャ イドウ

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Abstract

This report deals with characteristics of soil movement from artificial cutting slopes along forest roads through the observation of deposit soil at the base of slopes. On hillsides, soil layers are looser, as they approach the surface. However convex type slopes have deep soil layers contrary to our expectations. Therefore there is a great amount of soil movement. First, soil movement from cutting slopes reaches at the end of the deposit on the road surface. Starting from the end of the deposit, the sectional profile of the surface of deposit shows growth curves toward the base of the slope. Finally the surface of the deposit becomes the angle of repose. The volume of soil movement is directly proportional to the length of the cutting slope. The arrival distance of soil movement is related to the length of the cutting slope, but there is an upper limit. It is greater than 0.5m when the length of the cutting slope is 2m, and may flow into side ditches along the forest road. Road alignment corresponds to the shape of the cutting slope. Soil movenment from convex type slopes spreads, but its volume is greater than for others. Therefore, soil movement from this slope type has a great impact on the lower sections of forest roads and forest land.

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