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The Influence of Streambed Heterogeneity on Hyporheic Flow in Gravelly Rivers

机译：流化床异质性对砾石河流中流质的影响

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摘要

Deposits of open-framework gravel occurring in gravelly streambeds can exert a significant influence on hyporheic flow. The influence was quantified using a numerical model of the hyporheic zone. The model included open-framework gravel stratasets represented with commonly observed characteristics including a volume fraction of about one-third of the streambed sediment, a hydraulic conductivity two orders of magnitude greater than other strata present, and a spatial connectivity forming preferential-flow pathways. The influence of open-framework gravel stratasets on hyporheic flow was much greater than the influence of the channel morphology including meanders, point bars, dunes, and ripples. Seventy percent of the total hyporheic exchange occurred across 30% of the channel boundary at locations of open-framework gravel stratasets. The maximum local interfacial flux rates occurred at these locations, and were orders of magnitude greater than those at other locations. The local flux rates varied by six orders of magnitude over the channel boundary. The composite flow rate through the model with open-framework gravel stratsets was an order of magnitude greater than that through an equivalent but homogeneous model.
机译：在砾石河床中发生的开放式框架砾石的沉积会对流变流动产生重大影响。使用流变区的数值模型来量化影响。该模型包括具有通常观察到的特征的开放框架砾石地层，包括大约三分之一的河床沉积物的体积分数，比存在的其他地层大两个数量级的水力传导率，以及形成优先流动路径的空间连通性。开放框架的砾石地层对低渗流的影响远大于包括曲折，点形条，沙丘和波纹的河道形态的影响。总的流变交换的百分之七十发生在跨框架的砾石地层位置的通道边界的百分之三十。最大局部界面通量率发生在这些位置，并且比其他位置大几个数量级。局部通量率在通道边界上变化了六个数量级。通过具有开放框架砾石层的模型的复合流率比通过等效但均质模型的流率大一个数量级。

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  • 来源
    《Ground water》 |2014年第2期|206-216|共11页
  • 作者

    YaoQuan Zhou; Robert W. Ritzi Jr.; Mohamad Reza Soltanian; David F. Dominic;

  • 作者单位

    Department of Earth and Environmental Sciences, Wright State University, Dayton, OH 45435;

    Department of Earth and Environmental Sciences, Wright State University, Dayton, OH 45435;

    Department of Earth and Environmental Sciences, Wright State University, Dayton, OH 45435;

    Department of Earth and Environmental Sciences, Wright State University, Dayton, OH 45435;

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