TSUNAMI-INDUCED TOPOGRAPHY CHANGE IN COASTAL SEA AREA WITH NARROW PASS AND INFLUENCE OF SHORELINE CONDITION

Abstract

 Hydraulic experiments were carried out in order to analyze sediment transport and bottom topography change due to tsunami and accumulate the validation data of numerical model for coastal sea area with narrow pass. The experimental results revealed that high velocity flow in the narrow pass caused by tsunami passage induces local erosion. Furthermore, it was also found that suspended sand transported near the narrow pass settles down and forms deposition area behind the structure. The comparison of the results for two kind of shorelines, namely overflow and reflection types indicated that the condition of the shoreline has a strong influence on the flow structure and sediment transport induced by tsunami.