生物滞留系统对城市公路径流的治理作用 有无内部蓄水层设计的对比研究

研究评价了两种生物滞留系统对于综合公路径流的治理作用。该实验位于炎热干旱的德州布赖恩市德州农工大学（TAMU）河滨校区,实验者制作了5个大型的生态滞留装置,以便于在底部形成61cm深的内部蓄水（IWS）层,分别对有无内部蓄水层设计的生物滞留系统进行了模拟真实径流水量和水质的合成公路径流测试。比较结果表明,内部蓄水（IWS）层能减少洪峰流量、延长径流滞留时间,同时还显著提高了对铜、悬浮固体以及氮和磷的去除效果。尽管内部蓄水层改善了公路径流的治理,但在炎热干旱地区使用内部蓄水层持水仍面临巨大挑战,因为大量的水会通过蒸发而散失掉。接下来的研究需要制定关于内部蓄水层在炎热干旱地区应用的进一步方针。

Performance of Bioretention System in Treating Urban Highway Runoff:A Comparison Study of Designs with and without an Internal Water Storage Layer

This study evaluated the performance of two bioretention systems in treating synthetic highway runoff.The experiments were conducted on Texas A&M Riverside Campus located in Bryan,Texas,an area considered hot and arid.Five large-scale bioretention units were constructed with an option to form a 61-cm deep internal water storage(IWS) layer at the bottom.Synthetic stormwater simulating the quantity and quality of highway runoff was used to test the bioretention system with and without the IWS layer.The comparison results show that the IWS layer enhanced the effect on peak discharge reduction and detention time extension.The IWS layer also significantly improved the removal of copper,total suspended solids,total nitrogen and total phosphorus.Despite the improved performance by the IWS layer,holding water in the IWS layer presents a challenge in hot and arid areas,because a significant amount of water can be lost via evapotranspiration.Future research should develop further guidelines regarding the application of an IWS layer in hot and arid areas.