연안 지역의 침수 모의를 위한 XP-SWMM의 민감도 분석

Abstract

Coastal areas can be easily inundated rather than inland areas by combined natural hazards such as rainfall, tides, and wave overtopping. A previous study applying XP-SWMM to simulate coastal flooding was reasonable but it needed a further study on the proper ranges of parameters and space and temporal grid sizes of numerical method to solve shallow water equations. The purpose of the research is to find some proper ranges of the following parameters and grid sizes: Manning’s roughness coefficient, cell size, 2D calculation time steps, 2D inflow capture coefficient, Smagorinsky coefficient and wet/dry depth. The model sensitivity analyses were performed, relying on the archived inundation map on Marine City area for model validation that was drawn for Typhoon Chaba in 2016. As the results, the proper ranges were 0.02 to 0.035 for Manning’s roughness coefficient, 3.0 to 4.5 m for cell size, 0.1 to 3.0 sec for 2D calculation time steps, 0.06 to 1 for Smagorinsky coefficient, and 0.006 to 0.01 m for wet/dry depth. The results of this study can be used as good reference materials with a user manual of XP-SWMM when the researchers do the inundation analysis.