A METHOD FOR THE DAMAGE RISK ESTIMATION OF THE RIVERBANKS AND REVETMENTS BASED ON THE RIVER GEOMETRY CHARACTERISTICS AND STABILITY

Abstract

 We constructed method for the damage risk estimation of the riverbanks and revetments. The method estimates the risk based on the followings: 1) the channel longitudinal and cross-sectional geometry. 2) the deepest riverbed level. 3) the stable riverbed level and width, and 4) the dynamic equilibrium longitudinal profile riverbed level. The method was then applied to the Hikosan River. The results showed the followings: 1) damaged riverbanks and revetments were included in sections where the river channel was not stable, and the river tended to widen, 2) The damaged riverbanks and revetments were included in the method's serious damage risk potential zone, and 3) The later flooding has been observed to have damaged riverbanks and revetments in the high potential section for damage based on the past channel geometry.