RIVER IMPROVEMENT PROJECTS CONSIDERING PERFORMANCE OF HISTORICAL RIVER FACILITIES

Abstract

The Tohori construction area in Ichikawa have two oblique weirs, groynes and sluices, which are historical river facilities. Those facilities have maintained flood control and water utilization of Himeji City until today. However, their hydraulic performance has not been evaluated quantitatively. In this study, the hydraulic performance of those facilities was evaluated using three-dimensional survey and three-dimensional analysis. As a result, one of the oblique weirs had the effect of lowering the water level on the upstream at flood and the groynes had the effect of controlling the flow toward the downstream sluice. Therefore, their hydraulic performance were reflected in the river improvement.