BANK EROSION AND BED TOPOGRAPHY NEAR NATIONAL HIGHWAY NO.4 BRIDGE BY THE 1998 FLOOD IN YOSASA RIVER

Abstract

In the downstream basin, risk of inundation is lower. Bank erosion often occurs in the upstream basin of rivers due to rapid flood flow. Predicting weak points of bank erosion is also important to improve river efficiently. At a present stage, It is important that machanism of bank erosion is investigated by the use of field data, model experiments, numerical analysis.
In this paper, it is made clear that causes of bank erosion and bed topography near national highway No.4 bridge by the 1998 flood in Yosasa river.