3D NUMERICAL SIMULATION OF LATERAL OVERTOPPING FLOWS IN CURVED CHANNEL USING BOUNDARY FITTED COORDINATE SYSTEM

Abstract

In the recent flood disaster, the remarkable water level rise in river flows over a short period led to the levee breaching, which caused severe damage in the landside region. Therefore, numerical methods that can predict flood flows and bed deformation around a levee are of great significance for flood mitigation. In this study, a three-dimensional (3D) numerical model of open channel flows in a boundary fitted coordinate system with the density function method is used, and by comparing the hydraulic characteristics of simulation, such as water level and velocity distributions, to the previous experiments of lateral overtopping flows around a side weir in the curved channel, the reliability of the numerical model is validated and three-dimensional flow structures around side weir have also been investigated.