基于DTM的溃坝风险图编制技术

Technologies for dam-break risk mapping based on DTM

摘要: 溃坝洪水风险图对于制定区域防洪应急预案、进行溃坝洪水风险分析是十分必要的.利用BREACH模拟溃口,采用无结构网格有限体积法进行二维溃坝洪水演进计算,利用TIN模型将计算结果可视化,制作成水深风险图、流速风险图、淹没历时风险图、洪水到达时间风险图,并对风险图进行了空间分析.本文充分利用了GIS对空间数据以及空间数据和属性数据联合分析的功能,对溃坝洪水风险图制作的基本原理和方法进行了探讨,并应用于沙河集水库大坝溃坝模拟,具有较强的实用价值.

Abstract: Dam-break flood risk mapping is necessary to formulate flood prevention emergency plans and make analysis of dam-break risk.BREACH is used to stimulate changes in the shape of the break and calculate break-induced flow discharge.Two-dimension dam-break flood propagating numerical simulation is conducted based on unstructured grids and FVM.TIN model is applied to visualize the numerical simulation results.Risk maps of flood depth and flood velocity at different moments of dam-break,risk map of flood submerge...