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

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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 (I)
  • 等高線にそった帯状伐採が渓川流出に及ぼす影響-1-温暖期の長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 ケイガワ リュウシュツ ニ
  • Long-Term Runoff Characteristics during the Warm Season
  • 温暖期の長期流出特性について

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An analysis of the effects on long-time flow by contour-line strip-cutting during the warm season (June to October) was made by conducting a comparative study of meteorological and hydrological characteristics before and after cutting trees. The analysis was made of contour-line strip-cutting on the 1-gosawa watershed of the Takaragawa Forest Watershed Experiment Station of the Forestry and Forest Products Research Institute at a cutting area rate of 52.5%. The results of the analysis showed that the runoff tended to increase immediately after the strip cutting and that the mean runoff rate during the warm season increased from 21.1% to 35.0%. An analysis of the flow-duration curve indicated that the proportion of ordinary, low, and scanty runoffs during the seasonal runoff increased after the strip cutting compared with that before cutting. Quantitative changes in the runoff due to the strip cutting were caused by fluctuations of the evapotranspiration of the forest. An analysis of the evapotranspiration caused by the short-time period water-budget method showed that the evapotranspiration during the warm season decreased 66.3mm on average by strip cutting. This value was obtained by comparing it with measurement examples in other areas on which conditions differed. It was indicated that the value corresponded to 43% of the variations of the evapotranspiration by clear cutting during the warm season.

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