JIAJinrui,TONGYu,QILei,et al.Optimization of LID Facility Layout Based on GAST-SWMM Coupling Model[J].China Water & Wastewater,2026,42(3):130-136.
基于GAST-SWMM耦合模型的LID设施布设优化
- Title:
- Optimization of LID Facility Layout Based on GAST-SWMM Coupling Model
- 关键词:
- 城市内涝; GAST-SWMM耦合模型; 雨水系统排水能力; 低影响开发设施
- Keywords:
- urban waterlogging; GAST-SWMM coupled model; drainage capacity of rainwater system; low impact development (LID) facility
- 摘要:
- 以西安市高陵区泾渭镇部分区域为例，采用GAST-SWMM耦合模型进行数值模拟，根据布设原则确定低影响开发（LID）设施面积占比与3种布设方案，开展研究区域雨水系统现状排水能力分析和LID设施布设方案综合比选工作，以实现降低内涝风险的目标。结果表明，研究区域现状雨水系统排水能力不足，在2年一遇降雨条件下，有60.94%的节点和90.00%的管段已超载，积水面积达45.645 4×104 m2；提出了3种LID设施布设方案，采用层次分析法从水量调控、经济成本、环境效益3个方面进行综合效益评估，3个方案的综合效益得分分别为0.503 5、0.565 4、0.536 8，因此确定方案二即7%的透水铺装、13%的下沉式绿地、7%的雨水花园为最优方案。
- Abstract:
- Taking a selected area in Jingwei Town, Gaoling District, Xi’an City as a case study, this research employed the GAST-SWMM coupled model for numerical simulation. Based on layout principles, the area ratio of low impact development (LID) facilities and three layout schemes were determined. The drainage capacity of the existing rainwater system in the study area was analyzed, and a comprehensive comparison of LID facility layout schemes was conducted to achieve the goal of mitigating waterlogging risk. Results showed that the current rainwater system suffered from insufficient drainage capacity. Under a 2-year recurrence period rainfall event, 60.94% of nodes and 90.00% of pipe sections were overloaded, leading to a ponding area of 45.645 4×104 m2. Three LID facility layout schemes were proposed and evaluated using the analytic hierarchy process from three perspectives: water quantity regulation, economic cost, and environmental benefit. The comprehensive benefit scores of the three schemes were 0.503 5, 0.565 4, and 0.536 8, respectively. Hence, scheme Ⅱ comprising 7% permeable pavement, 13% sunken green space, and 7% rain garden, was identified as the optimal scheme.
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