城区内涝淹没模拟算法

Algorithm of urban storm flood inundation simulation based on TIN and triangular prism

针对城区内涝淹没范围和水深模拟问题,该文提出了一种基于约束Delaunay不规则三角网与三棱柱的城区内涝淹没模拟算法。该算法以沿地面三角形的顶点垂直向上引垂线形成的三棱柱为计算单元,通过"等体积"的方法,建立时间序列切片下的淹没水深和积水量的关系,据此实现淹没范围和水深模拟。以北京师范大学(简称"北师大")主校区为例,对单汇水区的水面高程上升模拟结果与实际观测值进行对比,基本吻合;并与传统栅格DEM的淹没效果进行了对比,表明该算法正确有效。

Based on the triangular prism and the urban land surface,this paper proposed a storm inundation simulation algorithm for inundated area and water depth simulation.The triangular prism,served as calculation unit,was constructed by triangular surface and its perpendicular line along each node.Based on the principle of equal volume,the relationship equation between water surface level and the accumulative water volume was proposed at each time serial slice.Then,the simulations of inundated area and water depth were realized by taking the main campus of Beijing Normal University as an example.Relative correctness of water level rising pattern in single catchment was proved by comparing the model calculated results with the measured values.The effectiveness and correctness of the CD-TIN and triangular prism based inundation simulation algorithm were validated by contrasting to traditional raster DEM based inundation algorithm.