Green roofs have been treated as practical low impact development (LID) strategies to retain stormwater runoff and alleviate the rainfall-induced flooding risks in urban regions. The purpose of this study was to analyze the hydrological effects of the spatial location of green roofs in urbanized catchments. In the built-up region of Beijing, 12 urbanized catchments with various architectural patterns were chosen as the study areas. To distinguish the spatial characteristics of roof surfaces, we defined the effective roof surfaces to distinguish from other types of roofs, which have more convenient or direct hydrological connections to drainage systems. A hydrological model was then used to simulate the stormwater mitigation performance of green roofs for the study catchments, which were assigned to different rainfall conditions. The simulation results confirmed the benefits of implementing green roofs for urban stormwater regulation. However, the spatial variability of green roofs showed inherent influences on the runoff mitigation capacity in urbanized catchments. Greening on effective roof surfaces would provide more effective stormwater regulation benefits, for reductions in both runoff volume and peak flow. In addition, the spatial arrangement characteristics of roof surfaces also influenced the hydrological efficiency of green roofs. The effect of the spatial location of green roofs on runoff mitigation was rainfall-dependent. These findings provide insights into the hydrological role of green roofs, and suggest that proper siting of LID facilities should be a consideration for urban stormwater management in order to fulfill the hydrological efficiency and cost-effectiveness planning target.

译文

:绿色屋顶已被视为实用的低影响开发(LID)策略,以保留雨水径流并减轻城市地区降雨引起的洪水风险。这项研究的目的是分析城市化集水区中绿色屋顶空间位置的水文影响。在北京建成区,研究区选择了12个具有各种建筑模式的城市化集水区。为了区分屋顶表面的空间特征,我们定义了有效的屋顶表面,以与其他类型的屋顶区分开来,其他类型的屋顶与排水系统之间的联系更为便捷或直接。然后,使用水文模型来模拟研究集水区的绿色屋顶缓解雨水的性能,这些集水区被分配给了不同的降雨条件。仿真结果证实了为城市雨水调节实施绿色屋顶的好处。然而,绿化屋顶的空间变异性显示了对城市化集水区径流缓解能力的内在影响。有效屋顶表面的绿化将提供更有效的雨水调节效益,以减少径流量和峰值流量。此外,屋顶表面的空间布置特征也影响了绿色屋顶的水文效率。绿化屋顶的空间位置对径流减缓的影响与降雨有关。这些发现提供了对绿色屋顶的水文作用的见解,并建议将LID设施的正确位置选为城市雨水管理的考虑因素,以实现水文效率和成本效益计划目标。

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