INFLUENCE OF COASTAL SEA AREA WITH NARROW PASS ON SEDIMENT TRANSPORT AND TOPOGRAPHY CHANGE DUE TO TSUNAMI

Abstract

 Hydraulic experiments were conducted in order to analyze the influence of coastal sea area with narrow pass on sediment transport and bottom topography change under tsunami action. Numerical simulations were also carried out for confirming the validity of a depth-averaged numerical model.
 The experimental results revealed that erosion volume is affected by the width of the narrow pass. It was also found that local erosion depth is strongly influenced by the shape of the narrow pass. The depth-averaged sediment transport numerical model is said to be able to reproduce the laboratory experiment appropriately in the case that local erosion hardly occurs.