Reddish Soil Runoff Prevention Measure using an Infiltration Trench with Wood Chips : Factors Influencing the Efficiency of the Measure and Numerical Estimation of the Efficiency

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  • ウッドチップを充填した浸透トレンチによる赤土等流出防止対策 : 対策効果に影響を与える要因と対策効果の客観的評価
  • ウッドチップ オ ジュウテン シタ シントウ トレンチ ニ ヨル アカツチ トウ リュウシュツ ボウシ タイサク : タイサク コウカ ニ エイキョウ オ アタエル ヨウイン ト タイサク コウカ ノ キャッカンテキ ヒョウカ

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Abstract

An infiltration trench with wood chips is more efficient method to prevent reddish soil runoff in an upland field. To put the measure to practical use, this study unvails two factors influencing the sediment reduction efficiency and estimates the USLE support practice factor P value. For the purpose of this study, field experiment was conducted under natural rainfall condition using six experimental slopes. The slope dimensions are 30 m long by 1 m wide. It was found that the efficiency increased as the trench volume was gained, and was higher in the slope with multiple trenches than with single one. It seems likely that the amount of unsaturated gap volume in the trench during rainfall event would be directly related to sediment removal. USLE P value of the infiltration trench was in the range of 0.1 to 0.3, and was smaller than that of conventional measures. In conclusion, the volume and the arrangement of the infiltration trench are factors affecting the sediment reduction efficiency, and USLE P value is estimated as the efficiency.

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