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Two-Dimensional(2-D) Flood Inundation Modeling Considering Mesh Type and Resolution

격자유형과 해상도를 고려한 2차원 홍수범람 모델링

Kim, Byunghyun
김병현

  • Received : 2019.01.29
  • Accepted : 2019.02.18
  • Published : 2019.04.01

Abstract

In this study, 2-D Godunov type finite volume model which can apply the mixed mesh including triangular and quadrilateral meshes for flood inundation modeling is used to compare and analyze the flood height, flood extent and model execution time according to mesh type and resolution. The study area is the Upton-upon Severn watershed in Great Britain, where the flood occurred for 22 days from October 29 to November 19, 2000. For the flood modeling, topographic data were constructed using high resolution LiDAR (Light Detection And Ranging). The results of the 2-D flood modeling by the mesh type and resolution were compared with four ASAR (Airborne Synthetic Aperture Radar) images captured during the flood period. This study has shown that flood height and extent can vary greatly depending on the mesh type and resolution, even if identical topography and boundary conditions are used, and that the selection of appropriate mesh type and resolution for the purpose and situation of the 2-D flood modeling is necessary.

Keywords

Mesh type;Mesh resolution;ASAR;2-D flood modeling;Finite volume model