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Improving understanding of mixed-land-use watershed suspended sediment regimes: Mechanistic progress through high-frequency sampling

机译:增进对混合土地利用流域悬浮沉积物制度的理解:通过高频采样的机械进展

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摘要

Given the importance of suspended sediment to biogeochemical functioning of aquatic ecosystems, and the increasing concern of mixed-land-use effects on pollutant loading, there is an urgent need for research that quantitatively characterizes spatiotemporal variation of suspended sediment dynamics in contemporary watersheds. A study was conducted in a representative watershed of the central United States utilizing a nested-scale experimental watershed design, including five gauging sites (n = 5) partitioning the catchment into five subwatersheds. Hydroclimate stations at gauging sites were used to monitor air temperature, precipitation, and stream stage at 30-min intervals during the study (Oct 2009-Feb. 2014). Streamwater grab samples were collected four times per week, at each site, for the duration of the study (Oct. 2009-Feb. 2014). Water samples were analyzed for suspended sediment using laser particle diffraction. Results showed significant differences (p < 0.05) between monitoring sites for total suspended sediment concentration, mean particle size, and silt volume. Total concentration and silt volume showed a decreasing trend from the primarily agricultural upper watershed to the urban mid-watershed, and a subsequent increasing trend to the more suburban lower watershed. Conversely, mean particle size showed an opposite spatial trend. Results are explained by a combination of land use (e.g. urban stormwater dilution) and surficial geology (e.g. supply-controlled spatial variation of particle size). Correlation analyses indicated weak relationships with both hydroclimate and land use, indicating non-linear sediment dynamics. Suspended sediment parameters displayed consistent seasonality during the.
机译:鉴于悬浮沉积物对水生生态系统生物地球化学功能的重要性,以及对混合土地利用对污染物负荷的影响的日益关注,迫切需要进行定量表征当代流域悬浮沉积物动力学时空变化特征的研究。在美国中部的一个代表流域进行了一项研究,采用的是嵌套规模的实验流域设计,包括五个测量站点(n = 5),将集水区划分为五个子流域。在研究期间(2009年10月至2014年2月),在测量地点的水文气候站每隔30分钟监测一次空气温度,降水和水流阶段。在研究期间(2009年10月至2014年2月),每周在每个站点采集四次河水取样。使用激光粒子衍射分析了水样品中的悬浮沉积物。结果表明,监测点之间的总悬浮沉积物浓度,平均粒径和淤泥量之间存在显着差异(p <0.05)。从主要的农业上游流域到城市中部流域,总浓度和淤泥量呈下降趋势,而向郊区更下游的流域呈上升趋势。相反,平均粒径显示出相反的空间趋势。结果是结合土地用途(例如城市雨水稀释)和表面地质(例如由供应商控制的颗粒大小空间变化)来解释的。相关分析表明与水文气候和土地利用之间的关系较弱,表明非线性沉积物动力学。在此期间,悬浮的泥沙参数显示出一致的季节性。

著录项

  • 来源
    《The Science of the Total Environment》 |2017年第15期|228-238|共11页
  • 作者单位

    University of Missouri, School of Natural Resources, 203 ABNR Building, Columbia, MO 65211, USA,West Virginia University, Institute of Water Security and Science, Davis College, Schools of Agriculture and Food, and Natural Resources, 3107 Agricultural Sciences Building, Morgantown, WV 26506, USA;

    West Virginia University, Institute of Water Security and Science, 3109 Agricultural Sciences Building, Morgantown, WV 26506, USA,West Virginia University, Davis College, Schools of Agriculture and Food, and Natural Resources. 3109 Agricultural Sciences Building, Morgantown, WV 26506, USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Suspended sediment; Laser particle diffraction; Particle size; Land use impacts; Experimental watershed study;

    机译:悬浮沉淀物;激光粒子衍射;粒度;土地使用影响;实验分水岭研究;
  • 入库时间 2022-08-17 13:49:08

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