千曲川水系の変遷に伴う流出形態の変化に関する研究

概要

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On the floods in the Chikuma, the relation between basin development and run-off trend is described on process of time. Firstly, the 1st principal component obtained from an principal component analysis using five factors of the basin development is adopted as a basin development index, and it becomes clear that the correlation between the index and run-off percentage has existed obviously. Secondly, it is proved that the 1st run-off percentage has increased gradually, and the time of flood concentration has reduced according to the run-off analysis using a storage function model. Finally, it is proved that the inundation damages have translated gradually from the upper basin to the middle or the lower one with development, and it is found that the retarding volume contributes to the reduction of flood run-off discharge.
日本自然災害学会の論文
1986-03-31