2006 年 22 巻 p. 899-904
A simple model for predicting change in sand bar of a river mouth was developed. Topographic changes of a river mouth bar were investigated first, taking the case of Sagami River and a river mouth facing the Pacific Ocean as the example. The equilibrium state of the profile of a sand bar is assumed and the strength of the recovery of river mouth topography is determined depending upon the shift from this equilibrium state. The offshore sand transport due to flood current and shoreward sand transport due to waves were modeled to predict three-dimensional change of a sand bar. Dynamic changes in a river mouth bar responding flood current and waves can be predicted by this model.