ABSTRACT

Today, urban stormwater management is moving towards Stormwater Control Measures (SCMs) that encourage water storage and infiltration to reduce urban runoff and contaminant transfer. Modelling tools are required to quantify SCMs benefits at catchment scale. Based on an original method of land cover representation in a rainfall-runoff model, this paper aims at assessing the impacts of permeable pavements and rooftop disconnection on runoff generation and Suspended Solids (SS) wash-off over urban surfaces. Six application catchments are delineated in a densely urbanised area of southern France as representatives of typical urban land uses. The results highlight significant reductions in runoff volume and SS loads, especially for the lowest return periods of the design storm. The scenarios’ benefits are variable among the catchments, emphasising the importance of considering urban space specificities for prioritizing the implementation of SCMs. The proposed method can easily be transposed elsewhere and extended to large urban catchments.

摘要

今天，城市雨水管理正在朝着雨水控制措施（SCM）迈进，这些措施鼓励储水和渗入以减少城市径流和污染物转移。需要建模工具来量化流域规模的供应链管理收益。基于降雨-径流模型中土地覆盖的原始表示方法，本文旨在评估渗透性路面和屋顶断开对城市表面径流产生和悬浮物冲刷的影响。在法国南部一个人口稠密的城市化区域中划定了六个应用流域，作为典型的城市土地利用的代表。结果表明，径流量和SS负荷显着减少，尤其是在设计风暴的最低回报期。方案的收益在集水区之间是可变的，强调了考虑城市空间特殊性以优先实施SCM的重要性。所提出的方法可以轻松地转移到其他地方，并扩展到大型城市集水区。