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首页> 外文期刊>Environmental Science & Technology >High Resolution Synoptic Salinity Mapping To Identify Groundwater-Surface Water Discharges in Lowland Rivers
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High Resolution Synoptic Salinity Mapping To Identify Groundwater-Surface Water Discharges in Lowland Rivers

机译：高分辨率天气盐度制图，以识别低地河流中的地下水-地表水排放量

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摘要

Quantifying distributed lateral groundwater contributions to surface water (GW-SW discharges) is a key aspect of tracking nonpoint-source pollution (NPSP) within a watershed. In this study, we characterized distributed GW-SW discharges and associated salt loading using elevated GW specific conductance (SC) as a tracer along a 38 km reach of the Lower Merced River in Central California. High resolution longitudinal surveys for multiple flows (1.3-150 m~3 s~(-1)) revealed river SC gradients that mainly decreased with increasing flow, suggesting a dilution effect and/or reduced GW-SW discharges due to hydraulic gradient reductions. However, exceptions occurred (gradients increasing with increasing flow), pointing to complex spatiotemporal influences on GW-SW dynamics. The surveys revealed detailed variability in salinity gradients, from which we estimated distributed GW-SW discharge and salt loading using a simple mixing model. Modeled cumulative GW discharges for two surveys unaffected by ungauged SW discharges were comparable in magnitude to differential gauging-based discharge estimates and prior GW-SW studies along the same river reach. Ungauged lateral inlets and sparse GW data limited the study, and argue for enhancing monitoring efforts. Our approach provides a rapid and economical method for characterizing NPSP for gaining rivers in the context of integrated watershed modeling and management.
机译：量化分布的侧向地下水对地表水（GW-SW排放量）的贡献是跟踪流域内非点源污染（NPSP）的关键方面。在这项研究中，我们使用升高的GW比电导（SC）作为示踪剂，对加利福尼亚中部下默塞德河38公里处的分布式GW-SW排放量和相关的盐负荷进行了表征。对多径流（1.3-150 m〜3 s〜（-1））进行的高分辨率纵向调查显示，河流SC梯度主要随流量增加而减小，这表明由于水力梯度减小，稀释效应和/或GW-SW排放量减少。但是，发生了异常（梯度随流量增加而增加），这表明对GW-SW动力学的复杂时空影响。调查显示了盐度梯度的详细可变性，据此我们使用简单的混合模型估算了分布的GW-SW排放量和盐分负荷。两次不受不受污染的SW排放影响的调查的模型化累积GW排放量，在规模上可与基于差分计量的排放量估算值和先前在同一河段的GW-SW研究相比较。不受约束的侧向进口和稀疏的GW数据限制了这项研究，并主张加强监测工作。我们的方法提供了一种快速而经济的方法，用于在综合流域建模和管理的背景下表征用于获取河流的NPSP。

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  • 来源
    《Environmental Science & Technology》 |2015年第8期|4842-4850|共9页
  • 作者

    Henry Pai; Sandra R. Villamizar; Thomas C. Harmon;

  • 作者单位

    School of Engineering and Sierra Nevada Research Institute, University of California, Merced, California 95343, United States;

    School of Engineering and Sierra Nevada Research Institute, University of California, Merced, California 95343, United States;

    School of Engineering and Sierra Nevada Research Institute, University of California, Merced, California 95343, 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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  • 正文语种 eng
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