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Selecting rainfall events for effective Water Sensitive Urban Design: A case study in Gold Coast City, Australia

机译:选择有效水敏感城市设计的降雨事件 - 以澳大利亚黄金海岸城市为例

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摘要

The current approach for protecting the receiving water environment from urban stormwater pollution is the adoption of structural measures commonly referred to as Water Sensitive Urban Design (WSUD). The treatment efficiency of WSUD measures closely depends on the design of the specific treatment units. As stormwater quality is influenced by rainfall characteristics, the selection of appropriate rainfall events for treatment design is essential to ensure the effectiveness of WSUD systems. Based on extensive field investigations in four urban residential catchments based at Gold Coast, Australia, and computer modelling, this paper details a technically robust approach for the selection of rainfall events for stormwater treatment design using a three-component model. The modelling results confirmed that high intensity-short duration events produce 58.0% of TS load while they only generated 29.1% of total runoff volume. Additionally, rainfall events smaller than 6-month average recurrence interval (ARI) generates a greater cumulative runoff volume (68.4% of the total annual runoff volume) and TS load (68.6% of the TS load exported) than the rainfall events larger than 6-month ARI. The results suggest that for the study catchments, stormwater treatment design could be based on the rainfall which had a mean value of 31 mm/h average intensity and 0.4 h duration. These outcomes also confirmed that selecting smaller ARI rainfall events with high intensity-short duration as the threshold for treatment system design is the most feasible approach since these events cumulatively generate a major portion of the annual pollutant load compared to the other types of events, despite producing a relatively smaller runoff volume. This implies that designs based on small and more frequent rainfall events rather than larger rainfall events would be appropriate in the context of efficiency in treatment performance, cost-effectiveness and possible savings in land area needed.
机译:从城市雨水污染保护接收水环境的目前的方法是采用通常称为水敏感城市设计(WSUD)的结构措施。 WSUD措施的治疗效率密切依赖于具体治疗单位的设计。随着雨水质量受降雨特征的影响,对治疗设计的适当降雨事件的选择对于确保WSUD系统的有效性至关重要。基于基于Gold Coast,Australia和Company Modeling的四个城市住宅集水区的广泛实地调查,本文详述了一种使用三组件模型选择雨水处理设计的降雨事件的技术稳健的方法。建模结果证实,高强度短的持续时间事件产生58.0%的TS负载,而它们仅产生29.1%的总径流量。此外,小于6个月的平均复发间隔(ARI)的降雨事件产生更大的累积径流量(占总径流量的68.4%)和TS负载(出口的TS负荷的68.6%)比大于6的降雨事件-Month Ari。结果表明,对于研究流域,雨水处理设计可以基于降雨,其平均值31mm / h平均强度和0.4小时。这些结果也证实,随着治疗系统设计的阈值,选择具有高强度持续时间的较小的ARI降雨事件是最可行的方法,因为这些事件累积地产生了与其他类型的事件相比的年度污染物负荷的主要部分。产生相对较小的径流量。这意味着基于小且更频繁的降雨事件而不是更大的降雨事件的设计将适用于治疗性能的效率,成本效益和可能节省所需的土地面积的背景下。

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