2024 Volume 80 Issue 17 Article ID: 24-17141
A numerical morphodynamic model for predicting the flushing and recovery of river mouth bar was presented. The numerical model was based on the three-dimensional morphodynamic model. In the river mouth bar flushing process due to a large discharge occurred by Typhoon or seasonal rainy conditions, the increase of water level on the upstream area of the river-mouth bar and river flow velocities were considered. In the recovery process of the river-mouth bar, the sediment transport distribution due to waves over the sand bar was considered. In this study, the applicability of the presented numerical model was examined for the sand bar of the Tenjin River Mouth in Tottori Prefecture. Two flushing cases, which were due to Typhoon1721 with stormy waves in Oct. 2017 and seasonal rainy strong flood in July, 2021, were used. In both cases, the river mouth bar flushing and reformation were reproduced. From comparing with the previous field investigation results, it was confirmed that the numerical model presented in this study gave qualitatively good results.
