An efficient dynamic uniform Cartesian grid system for inundation modeling |
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Authors: | Jing-ming Hou Run Wang Hai-xiao Jing Xia Zhang Qiu-hua Liang Yan-yan Di |
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Affiliation: | 1. Institute of Water Resources and Hydro-Electric Engineering, Xi''an University of Technology, Xi''an 710048, China;2. School of Civil Engineering and Geosciences, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK;3. Hydrology Bureau, Yellow River Conservancy Commission, Zhengzhou 450004, China |
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Abstract: | A dynamic uniform Cartesian grid system was developed in order to reduce the computational time in inundation simulation using a Godunov-type finite volume scheme. The reduction is achieved by excluding redundant dry cells, which cannot be effectively avoided with a conventional Cartesian uniform grid system, as the wet area is unknown before computation. The new grid system expands dynamically with wetting, through addition of new cells according to moving wet-dry fronts. The new grid system is straightforward in implementation. Its application in a field-scale flood simulation shows that the new grid system is able to produce the same results as the conventional grid, but the computational efficiency is fairly improved. |
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Keywords: | Uniform Cartesian grid system Flood simulation Wetting and drying Shallow water equation Godunov-type finite volume scheme |
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