Study on the Effect of Tsunami Mitigation with Tree-Lodging Based on the Indonesian Field Data

Coastal forest has a function to mitigate tsunami damage that is known from some field investigation after tsunami disaster. However some trees are broken by high tsunamis and flows. In this study, the field test on the lodging limit of Casuarina is examined and the moment limit model is proposed for lodging. And the numerical simulation in Painan, Indonesia investigates the tsunami mitigation effect of coastal forest. Tree is selected Casuarina which based on the results of field survey. In the numerical simulation, the coastal forest is treated as resistant obstacles against tsunami flow. The tsunami inundation area is simulated with Casuarina with tree-lodging model.