EFFECTS OF ACCURACY OF SPATIO-TEMPORAL COMPUTATION OF FLUID MODEL AND DIFFERENCES IN INITIAL CONDITION OF DRIFT SIMULATION ON THE ACCURACY OF DRIFT MODEL FOR ACTUAL TOPOGRAPHY

Abstract

 The accuracy of drift model is mostly compared with basic experiments using simple conditon, and the applicability of the model to actual topography is not clearly. In addition, since the drift model uses the simulation results conducted by the fluid model, it is necessary to verify the accuracy of the fluid model itself in space and time. In this study, the accuracy of the fluid model was verified using time series data of wave height and spatio-temporal data of inundation extent and surface velocities obtained from a series of experiments using a coastal city model, and then the accuracy of the drifting model was verified by using flow model whose accuracy was verfied. As a result, it was found that the simulation results by flow model was a good agreement with experimental results, but the accuracy of the drift model varied due to the influence of contact with structures on land and seafloor. In particular, localized contact with the seafloor in the complicated bathymetry is a factor that prevents the model from reproducing the experimental results. This results indicates the need of improvement of drift model.