Abstract
There are many types of coastal vegetation. However, the systematical method for evaluating the tsunami mitigation effect by coastal vegetation has not been established yet. Therefore, this study systematically analyzes the equations for tsunami through coastal vegetation and evaluates the vegetation effect on the tsunami run-up height and fluid force. The tsunami mitigation effects are investigated by numerical simulation based on non-linear long wave equations. When using dNall , cumulative vegetation length in streamwise direction that includes the effect of different vegetation stand structures, the evaluation of the tsunami mitigation effect has been enabled. The tsunami mitigation effect and dNall show high correlation, and evaluation equations for tsunami mitigation effect by coastal vegetation are given by exponential functions.
