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为减少城市地表雨水径流峰值流量、改善水质,透水性路面常常被用作源头控制的工程技术措施。透水性路面在欧洲和美国已广泛应用,但在澳大利亚的进展却在减缓。本文探讨透水性路面对地表径流水中污染物去除率的影响,径流水样取自南澳大利亚的四个不同地方,涉及四种不同的土地用途。研究结果发现,透水性路面可显著降低总氮、总磷和总悬浮物,还可降低可溶解重金属的浓度,包括铅和铜。然而,因为污染物浓度很低、而且常常低于检测仪器的极限,很难计算出准确的金属削减比例。本文描述测试结果和透水性路面结构系统中可能存在的“净化”原理。还将污染物去除率与国际上已经开展相关研究、公布的结果,进行对比。最后,本文描述了透水性路面系统怎样才能最好地与综合处理系统相结合,以确保透水性路面具有长久的使用寿命和进行低成本有效的运营维护。总体来说,透水性路面可以为保护地下水和流入下游的地表水水质,提供有效屏障。
In order to reduce the peak flow of urban surface rainwater runoff and improve the water quality, the permeable pavement is often used as the source of engineering measures. Permeable pavement has been widely used in Europe and the United States, but the progress in Australia is slowing. This article examines the effect of pervious pavements on contaminant removal in surface runoff waters taken from four different locations in South Australia and covering four different land uses. The results showed that the water-permeable pavement can significantly reduce total nitrogen, total phosphorus and total suspended solids, but also reduce the concentration of soluble heavy metals, including lead and copper. However, because contaminant concentrations are low and often below the limits of the instrumentation, it is difficult to calculate the exact metal reduction ratio. This article describes the test results and the possible “clean-up” principle in a permeable pavement structure system. The pollutant removal rate has also been compared with those published and published in the world. Finally, this article describes how a pervious pavement system can best be combined with an integrated processing system to ensure long-lasting service life and cost-effective operation and maintenance of the pervious pavement. In general, the water-permeable pavement provides an effective barrier to groundwater and downstream surface water quality.