Particulate and Dissolved Organic Matter in Stormwater Runoff Influences Oxygen Demand in Urbanized Headwater Catchments,Environmental Science & Technology

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Particulate and Dissolved Organic Matter in Stormwater Runoff Influences Oxygen Demand in Urbanized Headwater Catchments
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-01-06 , DOI: 10.1021/acs.est.0c04502
Kelly M. McCabe ₁ , Erik M. Smith _{1,

2,

3} , Susan Q. Lang ₁ , Christopher L. Osburn ₄ , Claudia R. Benitez-Nelson ₁

Affiliation

Increasing inputs of organic matter (OM) are driving declining dissolved oxygen (DO) concentrations in coastal ecosystems worldwide. The quantity, source, and composition of OM transported to coastal ecosystems via stormwater runoff have been altered by land use changes associated with urbanization and subsequent hydrologic flows that accompany urban stormwater management. To elucidate the role of stormwater in the decline of coastal DO, rain event sampling of biochemical oxygen demand (BOD) in samples collected from the outfall of stormwater ponds and wetlands, as well as samples of largely untreated runoff carried by stormwater ditches, was conducted across a range of urban and suburban development densities. Sampling also included measurements of particulate and dissolved carbon and nitrogen, carbon and nitrogen stable isotopes, and chlorophyll-a. Results suggest stormwater may be a significant source of labile OM to receiving waters, especially during the first flush of runoff, even though BOD concentrations vary both among and within sites in response to rain events. BOD variability was best predicted by particulate OM (POM) and chlorophyll-a, rather than the larger pool of dissolved OM. These findings demonstrate the importance of managing episodic stormwater discharge, especially POM, from urbanized areas to mitigate DO impairment in larger downstream systems.

中文翻译：

雨水径流中的颗粒物和溶解有机物影响城市化上游水源地的需氧量

有机物（OM）投入的增加正在推动全球沿海生态系统中溶解氧（DO）浓度的下降。通过雨水径流转移到沿海生态系统的OM的数量，来源和组成已因与城市化以及随之而来的城市雨水管理相关的水文流量相关的土地利用变化而发生了变化。为了阐明雨水在沿海溶解氧下降中的作用，从雨水池塘和湿地的排污口收集的雨水样品以及雨水沟带来的未经处理的径流样品进行了雨水事件生化需氧量（BOD）采样涵盖各种城市和郊区的开发密度。采样还包括测量颗粒和溶解碳和氮，碳和氮稳定同位素以及叶绿素一个。结果表明，雨水可能是接收水中不稳定的有机污染物的重要来源，特别是在径流的第一次冲刷期间，即使BOD浓度随雨水事件而在场内和场内发生变化。最佳的BOD变异性是由颗粒OM（POM）和叶绿素a预测的，而不是由较大的溶解OM池预测的。这些发现表明，管理突发性雨水排放，尤其是城市化地区的POM，对于减轻大型下游系统的DO损害至关重要。

更新日期：2021-01-19

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