Multiple rainfall event pollution transport by sustainable drainage systems: the fate of fine sediment pollution.
Multiple rainfall event pollution transport by sustainable drainage systems: the fate of fine sediment pollution.
复制标题
可持续排水系统的多次降雨事件污染输送：细泥沙污染的命运。
DOI：
10.1007/s13762-016-1177-y
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Allen D
中科院分区：
文献类型：
--
作者：
Allen D
可持续城市排水系统的一个关键设计准则是减轻城市雨水污染。目前的研究定义了可持续城市排水系统（SuDS）的污染物处理效率，通过在设计流事件期间滞留系统内的总悬浮固体、城市营养物质和重金属污染物，研究重点是沙子（bbb20毫米）沉积物运动。多个降雨径流事件对SuDS处理细粒泥沙（<2 mm）效率的影响尚未明确，滞留泥沙的时间运动尚未得到详细研究。本文中提出的实地研究解决了这一研究空白，通过使用一种新的稀土氧化物痕量方法，通过最佳实践设计的SuDS网络监测持续12个月的细沉积物运输。通过对三个处理系统（网络）细沉积物污染的时间步长监测，得出以下主要结论：(1)由于持续的多次降雨径流事件，细小沉积物在SuDS资产和网络中重新悬浮和重新沉积。(2)再次停牌持续52周以上。(3)从面积上看，线性湿地（监测网内）在多事件细沙滞留中的表现优于湿地和沼泽资产。(4)对SuDS网络内细沉积物的多个事件监测和分析突显了SuDS资产与当前设计事件预期相比表现不佳。
A key design criterion of sustainable urban drainage systems is to mitigate urban stormwater pollution. Current research defines sustainable urban drainage systems (SuDS) pollutant treatment efficiency through the detention of total suspended solids, urban nutrients and heavy metal pollutants within the system during a design flow event, with research focusing on sand (>2 mm) sediment movement. The impact of multiple rainfall–runoff events on the fine sediment (<2 mm) treatment efficiency of SuDS is not yet well defined, and the temporal movement of detained sediment has not been investigated in detail. The field research presented in this paper addresses this research gap, monitoring ongoing fine sediment transport through a best-practice-designed SuDS network over 12 months through the use of a novel rare earth oxide trace methodology. Through time-stepped monitoring of the fine sediment pollution across three SuDS treatment trains (networks), the following key conclusions have been drawn. (1) That fine sediment becomes re-suspended and re-deposited within SuDS assets and the network as a result of ongoing multiple rainfall–runoff events. (2) That this re-suspension continues for over 52 weeks. (3) That by area, linear wetlands (within the monitored networks) outperform wetland and swale assets in multiple event fine sediment detention. And (4) that multiple event monitoring and analysis of fine sediment within a SuDS network highlights the under-performance of SuDS assets against current design event expectations.