Effects of Contour-Line Strip-Cutting on Stream Flow (II)

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Other Title
  • 等高線にそった帯状伐採が渓川流出に及ぼす影響 (II)
  • 等高線にそった帯状伐採が渓川流出に及ぼす影響-2-温暖期の短期流出特性について〔英文〕
  • トウコウセン ニ ソッタ タイジョウ バッサイ ガ ケイセン リュウシュツ ニ
  • 温暖期の短期流出特性について
  • Short-Term Runoff Characteristics during the Warm Season

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An analysis of the effects of strip cutting on short-term runoff during the warm season (June to October) was made by conducting a comparative study of runoff characteristics before and after cutting trees. The analysis was made by strip cutting along contour lines the cutting area of 52.5% of the 1-gosawa watershed of the Takaragawa Forest Watershed Experiment Station of the Forestry and Forest Products Research Institute. The results of the analysis showed that direct runoff caused by strip cutting increased 6 to 13% in the runoff proportion (direct runoff/total storm precipitation). When the total storm precipitation exceeded 100mm, the specific peak flow increased 1.16 to 1.41 times after the strip cutting compared with before cutting. It was indicated that these values would become smaller compared with the values of clear cutting experiments. An analysis of recession curves in hydrographs showed that the recession constant after strip cutting would become small compared with before cutting. When no rain fell, the runoff produced a difference of 2.2mm in the total amount for ten days assuming the initial flow to be 2.0mm/day. The average value of initial losses were calculated using all of the data available for the study. The average values before strip cutting were 5.9mm with antecedent precipitation and 13.0mm without antecedent precipitation. After strip cutting, the average values were 5.2mm and 10.6mm respectively. It was indicated that initial losses after cutting were slightly smaller than those before cutting. Such variations in the runoff characteristics were assumed to be related closely to reductions in interception and evapotranspiration and to variations in soil moisture conditions caused by reductions in forest vegetation.

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