Effect of the aggregation level of surface runoff fields and sewer network for a SWMM simulation
Effect of the aggregation level of surface runoff fields and sewer network for a SWMM simulation
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DOI：
10.1016/j.desal.2007.02.115
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发表时间：
2008-06
期刊：
影响因子：
9.9
通讯作者：
S. Y. Park;Ki-Hyeong Lee;I. Park;S. Ha
中科院分区：
文献类型：
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作者：
S. Y. Park;Ki-Hyeong Lee;I. Park;S. Ha
如果不同数量的子流域的计算结果表现出相同的性能，则雨水径流建模中流域的分区级别就成为一个问题。本研究旨在确定 SWMM 模型在城市地区应用的适当空间分辨率处理水平。利用GIS叠加技术，综合考虑地表坡度条件、雨水管流向和现状土地覆盖状况，将子流域划分为水文相似单元（HSU）。根据三个不同级别的地表划分以及下水道连接数量，制定了三种地表-下水道替代方案，并用作 SWMM 应用的径流模拟场。结果发现，空间分辨率对地表径流结果的影响并不显着。另一方面，由不同土地覆盖条件组成的多个单元子流域聚合而成的单元子流域的累积污染负荷通过地表空间分辨率的恶化而减少。尽管总体径流格局和累积径流受空间分辨率影响较小，但模拟的下水道出口径流在峰值出现时间略有差异。
The partitioning level of a catchment in storm water runoff modelling becomes an issue if the calculated results from the different number of subcatchments show the same performance. This study aims to identify the proper processing level of spatial resolution for the SWMM model application in an urban area. Using GIS overlaying technique, the division of subcatchments as a hydrologic similarity unit (HSU) is achieved with a comprehensive consideration of surface slope conditions, flow directions of storm sewers, and current land cover situation. Three surface-sewer alternatives are made on the basis of three different levels of surface divisions as well as the number of sewer connections and used as runoff simulation fields for the application of SWMM. As the result, it is found that the effect of a spatial resolution on the surface runoff results is not significant. On the other hand, the accumulated pollution load from a unit subcatchment, which is built by aggregation of several unit subcatchments consisting of various land cover conditions, is reduced through the deterioration of surface spatial resolution. Although overall runoff pattern and accumulated runoff are slightly affected by spatial resolution, the simulated runoff from sewer outlet shows slight difference at the peak appearance time.