Water quality impacts of urban and non-urban arid-land runoff on the Rio Grande
Water quality impacts of urban and non-urban arid-land runoff on the Rio Grande
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DOI：
10.1016/j.scitotenv.2020.138443
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发表时间：
2020-08-10
影响因子：
9.8
通讯作者：
Khandewal, Aashish
中科院分区：
文献类型：
--
作者：
Regier, Peter J.;Gonzalez-Pinzon, Ricardo;Khandewal, Aashish
城市暴雨地表径流影响下游生态系统的水质动态。虽然这些影响在中温带地区有充分的记录，但在干旱流域却没有得到很好的限制，干旱流域的干旱期较长，遭受强烈但短暂的风暴，而且雨水排水系统通常与污水系统隔离。我们使用了位于沿着中格兰德河的高频原位水质传感器网络，以确定暴雨期间地表径流的来源，并跟踪水质的物理，化学和生物成分的快速变化。比电导率（SpCond）模式是一个可靠的指标的来源，区分径流事件主要起源于城市（SpCond凹陷）或非城市（SpCond尖峰）集水区。城市事件的特征是高荧光溶解有机物（fDOM）、低溶解氧（包括短暂缺氧
Urban surface runoff from storms impacts the water quality dynamics of downstream ecosystems. While these effects are well-documented in mesic regions, they are not well constrained for arid watersheds, which sustain longer dry periods, receive intense but short-lived storms, and where stormwater drainage networks are generally isolated from sewage systems. We used a network of high-frequency in situ water quality sensors located along the Middle Rio Grande to determine surface runoff origins during storms and track rapid changes in physical, chemical, and biological components of water quality. Specific conductivity (SpCond) patterns were a reliable indicator of source, distinguishing between runoff events originating primarily in urban (SpCond sags) or non-urban (SpCond spikes) catchments. Urban events were characterized by high fluorescent dissolved organic matter (fDOM), low dissolved oxygen (including short-lived hypoxia