中文摘要：

基于约束Delauney不规则三角网（CD-TIN）对复杂城区地表进行精细建模,采用三角形面片上的汇流模式划分汇水单元,为内涝淹没过程模拟提供基本的分析单元。顾及雨水篦排水能力和地表特征的复杂性,提出了汇水单元内产汇流的时空模型与建模方法,并利用三棱柱集的二分数值解法给出了内涝淹没范围和水深的求解算法。以北京师范大学主校园为例,对2012年＂7.21＂暴雨内涝淹没过程进行了模拟分析,结果表明,本文方法有效、结果可靠。

英文摘要：

Urban storm floods cause dramatically property damage and severely influence on city life. It is an emergency issue and a knotty problem to be solved. Much research focuses on raster-based DEM and hydrodynamic equations to simulate inundation processes. Nevertheless, current methods strictly require hydrology data and are unable to model accurately the urban terrain features. By employing a constrainted Delaunay triangular irregular network （CD-TIN）, complex urban surfaces are precisely modeled in detail. Urban basins, serving as simulation units, are generated based on the water flow rules for triangular surface. Referring to the capacity of the drainage and complexity of urban terrain features, we introduce the basin runoff yield and confluence method for spatio-temporal calculation step by step. In order to obtain the inundated extent and water depth, a numerical solution is put forward based on the concept of triangular-prism sets through dichotomy. The main campus of Beijing Normal University （BNU） is used as a case to construct the CD-TIN and to simulate the ＂7.21 storm＂ inundation event, 2012, to test the usability and suitability of the method presented. Simula- tion water depths are compared with the observation data, showing that the CD-TIN based method for urban inundation simulation is effective and reliable. The CD-TIN based simulation method will be useful for urban flood emergency preparation, storm flood risk analysis and urban reforms in potential inundation areas.