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Influence of Modern Stormwater Management Practices on Transport of Road Salt to Surface Waters

机译：现代雨水管理实践对道路盐分向地表水运输的影响

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摘要

Application of road salts in regions with colder climates is leading to ground and surface water contamination. However, we know little about how modern stormwater management practices affect the movement of road salt through urban watersheds. We investigated groundwater contamination and transport of road salts at two stormwater ponds in Baltimore County, Maryland. In association with the . ponds, we documented a plume of contaminated groundwater that resulted in Cl~- loadings to the adjacent stream of 6574 to 40 008 kg Cl~- per winter, depending on winter snowfall. We also monitored Na~+ and Cl~- ion concentrations and the temporal dynamics of conductivity at a range of stream sites in watersheds with and without stormwater management ponds. Streams draining watersheds with stormwater ponds had consistently higher conductivities and Cl~- concentrations during base flow conditions and often exhibited greater peaks in Cl~-and conductivity associated with winter storms and subsequent melting events, despite the degree of watershed development. Our results indicate that modern stormwater management practices are not protecting surface waters from road salt contamination and suggest they create contaminated plumes of groundwater that deliver Cl" and Na~+ to streams throughout the year.
机译：在气候较冷的地区施用路盐会导致地下水和地表水污染。但是，我们对现代雨水管理实践如何影响道路盐分通过城市集水区的流动知之甚少。我们调查了马里兰州巴尔的摩县的两个雨水塘中的地下水污染和道路盐分的运输。与关联。在池塘中，我们记录了受污染的地下水羽流，根据冬天的降雪量，每年冬天向邻近的6574至40008 kg的Cl--河流产生Cl_-负荷。我们还监测了有或没有雨水管理池塘的流域内一定浓度的Na〜+和Cl〜-离子浓度以及电导率的时间动态。尽管分水岭发展程度高，但在基流条件下，流经雨水塘的流域的水流始终具有较高的电导率和Cl〜-浓度，并且经常表现出与冬季暴风雨和随后的融化事件相关的Cl〜-和电导率峰值。我们的结果表明，现代雨水管理实践并不能保护地表水免受道路盐分污染，并表明它们会形成受污染的地下水羽状流，这些羽状流全年都将Cl_和Na〜+输送到河流中。

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  • 来源
    《Environmental Science & Technology》 |2017年第8期|4165-4172|共8页
  • 作者

    Joel W. Snodgrass; Joel Moore; Steven M. Lev; Ryan E. Casey; David R. Ownby; Robert F. Flora; Grant Izzo;

  • 作者单位

    Urban Environmental Biogeochemistry Laboratory, Towson University, Towson, Maryland 21252, United States,Department of Fish and Wildlife Conservation, Virginia Tech, Blacksburg, Virginia 24061, United States;

    Urban Environmental Biogeochemistry Laboratory, Towson University, Towson, Maryland 21252, United States;

    Urban Environmental Biogeochemistry Laboratory, Towson University, Towson, Maryland 21252, United States;

    Urban Environmental Biogeochemistry Laboratory, Towson University, Towson, Maryland 21252, United States;

    Urban Environmental Biogeochemistry Laboratory, Towson University, Towson, Maryland 21252, United States;

    Urban Environmental Biogeochemistry Laboratory, Towson University, Towson, Maryland 21252, United States;

    Urban Environmental Biogeochemistry Laboratory, Towson University, Towson, Maryland 21252, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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