Surface Runoff Generation of Devastated Weathered Granite Mountains

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Other Title
  • 風化花崗岩荒廃山地における地表流発生機構
  • 風化花崗岩荒廃山地における地表流発生機構--中国南部の大獲流域と田上山地の若女裸地谷の比較
  • フウカ カコウガン コウハイ サンチ ニ オケル チヒョウリュウ ハッセイ キコウ チュウゴク ナンブ ノ ダイカクリュウイキ ト タナカミ サンチ ノ ジャクジョ ラチダニ ノ ヒカク
  • Comparison between Dahou experimental basin in the southern part of China and Jakujo Rachidani experimental basin in Tanakami mountains
  • 中国南部の大獲流域と田上山地の若女裸地谷の比較

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Description

In order to investigate the relationship between the landform characteristics and the surface runoff generation process devastated mountains, field observations were conducted in two experimental basins, Dahou experimental basin in the southern part of China, and Jakujo Rachidani experimental basin in the central part of Japan. The following findings resulted from those observations. In Dahou experimental basin ; 1) The saturated hydraulic conductivity is very small, and the regolith layers are thick with great soil storage capacities. 2) The time lags between the peak of runoff and their corresponding peaks of rainfall are very short. 3) As total precipitation increases, the direct runoff percentage does not usually. 4) The pressure heads on the soil layer nearest to the ground surface are greatest. These results suggest that, in Dohou basin, most important flow pathway during storm is Horton overland flow. This flow is generated because the surface soil layer consists of lowly permeable soil.<br>In Jakujo Rachidani experimental basin of Japan, Horton overland flow is not generated, because the surface soil layer consists of highly permeable soil. As the results, there is a certain amount of time lag between the peaks of runoff and the peaks of rainfall, and the direct runoff percentages in the Jakujo Rachidani experimental basin are less than that in Dahou experimental basin.

Journal

  • Sabo Gakkaishi

    Sabo Gakkaishi 51 (6), 13-19, 1999

    Japan Society of Erosion Control Engineering

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