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首页> 外文期刊>Journal of Hydraulic Engineering >Sand Transport over an Immobile Gravel Substrate
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Sand Transport over an Immobile Gravel Substrate

机译：固定砂砾基层上的砂土运输

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摘要

Experiments were conducted in a laboratory flume channel to evaluate the effects of increasing amounts of sand on its transport over and through an immobile coarse gravel bed. Detailed measurements of sand transport rate, bed texture, and bed topography were collected for four different discharges at approximately the same flow depth of 0.2 m for 11 different elevations of sand in the gravel bed. Sand transport was measured using both physical samples and a density cell. For a given flow rate, increases in the elevation of sand relative to gravel resulted in decreases of bed shear stress from 32-44% and increases in sand transport by three orders of magnitude. For the highest two discharges, the sand merged into a small number of long and low bed forms that translated through and over the gravel bed. A collapse of the transport data was accomplished by relating the sand transport rate to the bed shear stress scaled by the cumulative probability distribution function of the gravel surface evaluated at the height of the mean sand bed.
机译：在实验室水槽通道中进行了实验，以评估数量不断增加的沙子对其在不流动的粗砂砾层上和中的运输的影响。对于砾石床中11种不同高度的砂子，在大约相同的0.2 m流动深度下，针对四种不同的流量收集了详细的砂传输速率，床构造和床形貌测量结果。使用物理样品和密度池测量了沙的运输。对于给定的流速，相对于砾石的砂土高度的增加导致床层剪应力从32-44％减小，并且砂土输送增加了三个数量级。对于最高的两次排放，沙子会融合成少量的长床和低床形式，这些形式通过砾石层并在砾石层上移动。输运数据的崩溃是通过将砂的输送速率与通过在平均砂床高度评估的砾石表面的累积概率分布函数确定的砂床剪切应力相关联来完成的。

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  • 来源
    《Journal of Hydraulic Engineering》 |2013年第2期|167-176|共10页
  • 作者

    R. A. Kuhnle; D. G. Wren; E. J. Langendoen; J. R. Rigby;

  • 作者单位

    National Sedimentation Laboratory, USDA-ARS, P.O. Box 1157,Oxford, MS 38655;

    National Sedimentation Laboratory, USDA-ARS, P.O. Box 1157,Oxford, MS 38655.;

    National Sedimentation Laboratory, USDA-ARS, P.O. Box 1157,Oxford, MS 38655.;

    National Sedimentation Laboratory, USDA-ARS, P.O. Box 1157,Oxford, MS 38655;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    sand; gravel; sediment transport;

    机译：砂;砾石;泥沙输送;

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