DEM空间分块的洪水动态演进算法研究与应用

Research and application of flood dynamic evolution algorithm by DEM spatial partition

为了实现洪水演进过程快速模拟及关键信息提取,该文提出基于DEM空间分块的洪水动态演进算法。该算法设计融合了种子蔓延和水量等体积的思想,结合数字高程模型,以空间分块作为迭代单元,能较好呈现洪水演进的动态变化过程。算法主要针对决堤式洪水情景,支持静态和动态洪水参量的输入。通过在理想地形和情景地形的适用性测试,证明了该算法不仅具有良好的模拟精度,而且能准确表达不同地形单元的淹没特征。利用该文算法在大山咀子水文站区域实现洪水演进模拟,得到淹没面积和水深的动态变化结果。通过与基于种子蔓延、基于无源淹没的算法对比,该文算法的计算效率最优,重叠度检验结果也证明模拟精度良好。

To achieve rapid simulation of flood evolution process and key information extraction,this paper proposed a flood dynamic evolution algorithm based on spatial partitions by DEM. The algorithm design combined the idea of seed spreading algorithm and water equal volume. Combined with the digital elevation model(DEM),the spatial partition was used as the iterative unit,which can represent the dynamic changing process of the flood evolution. The algorithm was mainly for the burst levee flood scenario and supported the input of static or dynamic flood parameters. Through the applicability tests of ideal and scenario terrain,it was proved that the algorithm not only has good simulation accuracy,but also can accurately express the submergence characteristics of different terrain units(river,flood storage area,mountain,levee). Using the proposed algorithm,the flood evolution simulation was carried out in the test area near Dashanzuizi hydrological station,and the dynamic changes of the flooding duration,range and water depth were obtained. Compared with the algorithm based on seed spreading and non-source inundated,the computational efficiency of the proposed algorithm was better than these algorithms. The overlap test results showed that the simulation accuracy was good.