中文摘要：

在城市雨水径流水量和水质分析中，SWMM模型具有一定的适用性和准确性，因此可以作为城市雨洪管理的辅助性工具。而在运用SWMM时，为了精确表示汇水区内的空间差异性和各种水文元素的差异，首先要对汇水区进行不同程度的离散，并概化离散后子汇水区的水文差异性。为此，分析了汇水区的离散方式对雨水径流水量和水质模拟结果的影响，并提出了汇水区在不同场地下的离散方法。

英文摘要：

SWMM model is used as the auxiliary tool for urban stormwater management due to its applicability and accuracy in urban stormwater runoff quantity and quality analysis. When applying the model, the catchment should be firstly discretized into sub-catchments to characterize the spatial and hydrological differences among sub-catchments, and the hydrological difference between sub-catchments after discretization was generalized. The effect of catchment discretization on rainfall runoff and water quality modeling was analyzed. A discretization method for different spatial scales was put forward.