Understanding the amount of pollutants contributed by impermeable urban surfaces during rain events is necessary for developing effective stormwater management. A process-based pollutant load model, named Modelled Estimates of Discharges for Urban Stormwater Assessments (MEDUSA), was further developed (MEDUSA2.0; Christchurch, New Zealand) to include simulations of dissolved metal loadings and improve total suspended solids (TSS) loading estimations. The model uses antecedent dry days, rainfall pH, average event intensity and duration to predict sediment and heavy metal loads generated by individual surfaces. The MEDUSA2.0 improvements provided a moderate to strong degree of fit to observed sediment, copper, and zinc loads for each modelled road and roof surface type. The individual surface-scale modelling performed by MEDUSA2.0 allows for identification of specific source areas of high pollution for targeted surface management within urban catchments.

中文翻译：

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预测不透水表面未经处理的城市径流中基于事件的沉积物和重金属负荷

了解雨水事件期间不透水的城市表面贡献的污染物数量对于开发有效的雨水管理是必要的。进一步开发了一种基于过程的污染物负荷模型，名为城市雨水评估排放模型估计 (MEDUSA)（MEDUSA2.0；新西兰基督城），以包括模拟溶解金属负荷并改善总悬浮固体 (TSS) 负荷估计。该模型使用前期干旱日数、降雨 pH 值、平均事件强度和持续时间来预测单个表面产生的沉积物和重金属负荷。MEDUSA2.0 的改进为每种模拟的道路和屋顶表面类型提供了对观察到的沉积物、铜和锌负载的中等至强的拟合程度。由 MEDUSA2 执行的单个表面尺度建模。