【摘要】 提出基于GIS和SWMM的双层排水系统构建方法。采用GIS水文分析、栅格计算和叠置分析等工具,提取地表洼地的空域结构属性和连接水网特征,构建地表一维排水模型。采用SWMM水文和水力建模,研究地表排水模型与地下管流模型的水动力耦合方式和机制,构建双层耦合排水系统。结合GIS空域数据库和SWMM水动力计算结果,完成地表积水的演进计算,实现二维淹没的动态显示。结果表明,提出的双层排水模型既可保留一维模型在计算上的高效性和稳定性,又可调控地表洪涝的模拟精度,显示地表易涝区的淹没范围和水深,可为城市洪涝模拟提供选择方案和工具。更多还原

【Abstract】 The modeling approach of a dual layer drainage system based on GIS and SWMM was proposed. Spatial structural properties of surface basin and connected water network characteristics were extracted to build the surface one-dimensional drainage model through using GIS-based tool of hydrological analysis, raster calculation and superposition analysis. The hydrodynamic coupling mode and mechanism between surface drainage model and underground drainage model were explored to build a coupled dual layer drainage system by using SWMM-based hydrological and hydraulic modeling. Combining GIS-based spatial database and SWMM-based hydrodynamic calculation results, evolution calculation of accumulated water was accomplished to realize the dynamic display of two-dimensional submersion. The results showed that the proposed dual layer drainage model could not only retain high the computation efficiency and stability of the one-dimensional model, but also regulate the simulation accuracy of surface flood and display the flood range and water depth of waterlogged area, which could provide options and tools for urban flood simulation.更多还原