2025 Volume 81 Issue 15 Article ID: 24-15006
This study investigates the influence of the inertial force term in shallow water simulations through a coastal forest. First, we formulate two patterns of 2D shallow water momentum equation which consider trees’ resistance as an external force term consisting of either the drag force or the combination of drag and inertial forces. To obtain the parameters characterizing drag and inertial force, we carry out the 3D numerical flow tests with the 3D tree model. Finally, we conduct several 2D dam break simulations by incorporating the evaluated parameters into the resistance force term. By comparing the wave arrival time and the inundation depth, we could argue that the existence of inertial force has the potential to affect the ultimate evaluation of disaster mitigation performance of trees if they are densely arranged.
