落差工による礫床河川の河床安定化に関する検討

抄録

This study deals with bed profiles of the downstream from weir or ground sill. In order to investigate the stability of bed protection works, field observation and numerical simulations were made. In the field observation, the bed profiles were surveyed longitudinally and transversely, and the water surface profiles and the bed degradation were investigated. It was observed that step-pool systems are formed. An example of rubble work by using step-pool systems is shown

In the numerical investigations, the downstream flows from apron were approximated as curved wall jets. The tractive forces were estimated by the equations arranged the results which have been already characterized. The reduction effect by the height of ground sill is shown.