An efficient dynamic uniform Cartesian grid system for inundation modeling  

作　　者：Jing-ming Hou Run Wang Hai-xiao Jing Xia Zhang Qiu-hua Liang Yan-yan Di 

机构地区：[1]Institute of Water Resources and Hydro-Electric Engineering,Xi'an University of Technology [2]School of Civil Engineering and Geosciences,Newcastle University [3]Hydrology Bureau,Yellow River Conservancy Commission

出　　处：《Water Science and Engineering》2017年第4期267-274,共8页水科学与水工程（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.19672016);the National Key R&D Program of China(Grant No.2016YFC0402704);the State Key Program of the National Natural Science Foundation of China(Grant No.41330858);the UK Natural Environment Research Council(NERC)(Grant No.NE/K008781/1)

摘　　要：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.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.

关 键 词：UNIFORM CARTESIAN grid system FLOOD simulation WETTING and drying Shallow watere quation Godunov-type finite volume scheme 

分 类 号：TV122[水利工程—水文学及水资源] TV87