DEVELOPMENT OF FLUID-SEDIMENT-SEABED INTERACTION MODEL AND ITS APPLICATION

To provide a computational framework for simulating fluid-sediment-seabed interactions, a three-dimensional coupled fluid-sediment-seabed interaction model was developed and applied to seabed response under regular waves and local scouring from tsunami run-up. For the seabed response under the regular waves, the validity of the model was verified from comparison with an analytical solution. For the seabed response under the tsunami-induced local scouring, numerical results showed that the model had sufficient computational capability to simulate the seabed response during the onset of the local scouring, and suggested that the model is a useful tool for analyzing and evaluating a general complex fluid-sediment-seabed interaction phenomenon in a marine environment.