SUBGRID NUMERICAL MODELING OF TSUNAMI AND STORM SURGE INUNDATION IN A COASTAL URBAN SETTING

Zhongduo Zhang,Nobuki Fukui,Nobuhito Mori,Andrew Kennedy,Andrew Copp,Takashi Yamamoto,Tomohiro Yasuda,Yu Chida

doi:10.9753/icce.v36v.currents.11

Abstract

An experiment using a physical model of a coastal city was conducted to simulate tsunami and storm surge conditions which may lead to city inundation. The results of the physical experiment were compared with those from a subgrid numerical model based on the shallow water equation using the topography of the physical experiment obtained from LIDAR scanning. The experiment aims to provide a better understanding on the variation of tsunami or storm surge inundation level at different locations of the city due to the ground elevation, building arrangement, and shielding effects. The result from this experiment will serve to increase the accuracy of coastal numerical models and revise the current hazard maps and evacuation plans.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/k4v5EotRpfg

Highlights

Modern coastal cities are facing increased danger coming from the ocean as they continue to expand by land reclamation, due to high population density with limited amount of land
The digital surface model (DSM) data from the LIDAR scanning further provided ground elevation of each wave gauge location, which was useful for wave gauge data calibration, and the relationship between the maximum inundation and the building pattern
The initial results indicate that the subgrid model shows a good match between the experiment results, in several locations there is deviation possibly due to the complexity of the city topography

Summary

Introduction

Modern coastal cities are facing increased danger coming from the ocean as they continue to expand by land reclamation, due to high population density with limited amount of land. Inundation and the required time to reach that may depend on various factors, including the distance from the location to coastline, density as well as height of buildings surrounding the location, etc. The digital surface model (DSM) data from the LIDAR scanning further provided ground elevation of each wave gauge location, which was useful for wave gauge data calibration, and the relationship between the maximum inundation and the building pattern.

Results

Conclusion