断面の急変する急流河川に先鋭な流量ハイドログラフが流下した場合の水理現象

抄録

Hydrographs of steep small rivers with drainage areas of several hundreds square kilometers tend to be characterized by sharp peaks. It is generally known that in a river section consisting of a succession of sharp bends or of sharp widenings or constrictions, distinctive phenomena due to the river’s unique channel characteristics occur.

In this study, experiments are conducted to compare the case that flush flood is discharged with the case that steady flow is discharged, using a hydraulic model which has such characteristics as steep small rivers. Following the results, external force computations of velocity and tractive force with the calculation of movable bed of quasi-three dimensions. Attention is paid to the phenomena of sediment transportation and water level fluctuation, and the effects of channel alignment and discharge conditions are considered. As the result, important notice in the steep small river channel projects is indicated.