2000 Volume 44 Pages 1233-1238
From river management point of view, it is important to forecast morphological behavior after river modification work such as straightening, widening and excavation. However, little is known about theinfluence of artificial impact on channel processes, especially in small rivers, because of lack of data. Therefore, in order to supply the information mentioned above, we investigated morphological changes after river channel improvement work in an actual river. In this paper, we deal with temporalchanges of bed configuration after excavation of the meandering low-flow channel which was carried out in the Yamamori River. By field survey, we examined the plan form variation of low-flow channel, the bed profile in the longitudinal direction and the grain-size distribution of bed materials. The significant difference of discharge, which is one of the main features of floods in small rivers, leads to considerably different morphological behaviors. This channel morphology was analyzed by the numerical model, and channel processes in the Yamamori River were explained on the basis of the numerical results.
