STUDY ON THE INFLUENCE OF STRUCTURES ON THE SEDIMENT TRANSPORT DUE TO THE TSUNAMI RUN-UP TO RIVER

Abstract

 The sediments within the tsunami inundation flow increases their density. In addition, it is known that the horizontal and vertical forces of the tsunami inundation flow increase accordingly. Thus, it is important to consider sediments when we studied flume experiments of tsunami run-up to river. In this study, we simulated the tsunami run-up to river using two types of sediment, such as fine and coarse sands, and studied a flume experiments on the effect of the tsunami on structure and sediment transport. As a result of this study, we have clarified the following three points. The tsunami inundation flow scours the sediments around the structure. In addition, due to the influence of the structure, almost no sand is deposited behind the structure. The density of tsunami inundation flow is higher under the condition that fine sand is on the sea side and coarse sand is on the river side. The wave force that hits in front of the structure increases when fine sand is on the sea side and coarse sand is on the river side.