Green roof can mitigate urban stormwater and improve environmental, economic, and social conditions. Various modeling approaches have been effectively employed to implement a green roof, but previous models employed simplifications to simulate water movement in green roof systems. To address this issue, we developed a new modeling tool (SWMM-H) by coupling the stormwater management and HYDRUS-1D models to improve simulations of hydrological processes. We selected green roof systems to evaluate the coupled model. Rainfall-runoff experiments were conducted for a pilot-scale green roof and urban subbasin. Soil moisture in the green roof and runoff volume in the subbasin were simulated more accurately by using SWMM-H instead of SWMM. The scenario analysis showed that SWMM-H selected sandy loam for controlling runoff whereas SWMM recommended sand. In conclusion, SWMM-H could be a useful tool for accurately understanding hydrological processes in green roofs.

中文翻译：

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使用SWMM和HYDRUS耦合模型评估屋顶绿化实践。

屋顶绿化可以缓解城市雨水并改善环境，经济和社会条件。有效地采用了各种建模方法来实现屋顶绿化，但是以前的模型采用了简化方法来模拟屋顶绿化系统中的水运动。为解决此问题，我们通过将雨水管理和HYDRUS-1D模型耦合在一起来开发新的建模工具（SWMM-H），以改进水文过程的模拟。我们选择了绿色屋顶系统来评估耦合模型。对中试规模的绿色屋顶和城市子流域进行了降雨径流试验。使用SWMM-H而不是SWMM可以更准确地模拟绿化屋顶中的土壤水分和子流域的径流量。情景分析表明，SWMM-H选择沙质壤土来控制径流，而SWMM建议使用沙土。