低水流出の低減係数と低減曲線の求あ方およびそれらの季節変化

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  • Method of determining a recession coefficient and recession curves for a low flow and its seasonal changes
  • 低水流出の低減係数と低減曲線の求め方およびそれらの季節変化
  • テイスイ リュウシュツ ノ テイゲン ケイスウ ト テイゲン キョクセン ノ

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In past research, the runoff several days after the end of a rainfall and thereafter was considered a low flow, and steps of using this runoff data to analyze the recession coefficient and recession curves of the low flow in the days without rainfall were taken. However, in the case of analyzing a low flow by this method, it was affected by the conditions of the rainfall, and the data on runoff sufficient for explaining the reduction coefficient and recession curves in every month could not necessarily be obtained. Accordingly in this study, as a method of analyzing data without being affected by the conditions of rainfall, it was decided to use a long term runoff model, and the model used was that developed by the author. The basins used as objects of analyses were the Shirasaka Basin and the Higashiyama Basin on the University of Tokyo Forest in Aichi Prefecture, and on the whole, the conformity of the model was good, particularly the conformity to a low flow was extremely good. The recession coefficient was at a minimum in January, gradually increasing from February to August, and was at a maximum in August. In addition, it was found that the recession coefficient in September and thereafter decreased rapidly. The seasonal changes of the recession coefficient in this manner was similar to the seasonal changes of the evapotranspiration in these basins, and from this fact, it became known that as has been said so far, recession coefficient changes are affected by evapotranspiration. Furthermore, when the recession curves of the low flows in both basins were compared, they were nearly equal, and this because the geological features in both basins are the same.

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