Verification of Performance of Model for Predicting Formation of River-Mouth Terrace in Dynamic Equilibrium

Abstract

The effect of the river-mouth current on sand movement around a river-mouth terrace was incorporated into the contour-line-change model to predict the dynamic equilibrium topography under the action of waves and current. Then, the river-mouth terrace topography, the velocity distribution of the river-mouth current, and the grain size distribution were measured at the mouth of the Yumizutani River flowing into Lake Biwa. The performance of the model was evaluated on the basis of these field data. The impact of river-mouth improvement such as the construction of jetties at the river mouth was also examined using the present model.