ウッドチップを充填した浸透トレンチの土砂流出防止効果と浸透特性

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We have developed the "infiltration trench" to prevent reddish soil runoff from upland fields. The infiltration trench is set up at the lower end of the slope and filled with wood chips. On the slope, the surface runoff water with suspended soil flows into the infiltration trench and filters through the soil. In this study, effects of the infiltration trench on the prevention of surface water and suspended sediment runoff was examined. The experiment was conducted under natural rainfall condition using two slopes (2.0-m width×12.0-m length) during 2007. One is the experimental slope with infiltration trench (0.6-m width×2.0-m length×1.0-m depth) and another is the control slope without infiltration trench. The following results were obtained; i) surface runoff water on the experimental slope was 90% less than that on the control slope in case of precipitation less than 50mm, and 60% less in case of precipitation of 200mm; ii) suspended soil runoff on the experimental slope was 80% less than that on the control slope in case of precipitation of 200mm; iii) although surface runoff water on the experimental slope was 50% less than that on the control slope, suspended sediment runoff on the experimental slope was 80% less than that on the control slope; iv) the permeability of the trench was not reduced during the seven months of research; v) correlation between the permeability at the start of a rainfall event and the amount of precipitation in the seven days before the rainfall event was high. From these results, the high efficiency of the infiltration trench for the prevention of reddish soil runoff was confirmed.
日本雨水資源化システム学会の論文

ウッドチップを充填した浸透トレンチの土砂流出防止効果と浸透特性

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