Study on Reducing Tsunami Inundation Energy by the Modification of Topography based on Local Wisdom

The effective use of those local wisdoms is strongly desired, especially in developing countries, because it is quite difficult for those countries to allocate enough budgets for constructing hard-type countermeasures against tsunami. Among local wisdoms against tsunami hazard, this study evaluated the efficiency of a hollow topography which can be seen on the beach along Lampon village in Indonesia. These artificial hollows are arrayed on the beach as one of the local wisdoms in Lampon village to reduce the intensity of inundated tsunami flow. The numerical simulation of tsunami inundation energy was conducted to evaluate the efficiency of this hollow topography. In order to investigate the effect of artificial topography and vegetation belt, this study conducted a numerical simulation utilizing CADMAS-SURF 3D. Furthermore, this study evaluated the efficiency of some contrivances, such as combination of vegetation belts and a multiple-use of hollow and embankment topography, in order to enhance the performance of a countermeasure based on the local wisdom.