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velocity profiles assessment in natural channels during high floods

机译：大洪水期间自然通道的速度剖面评估

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摘要

The accuracy of three different approaches for velocity profiles assessment during high floods, when the velocity points sampling is carried out only in the upper portion of the flow area, has been investigated. The first two methods assume the classical logarithmic law with additional terms, to take account of the dip-phenomenon in the velocity profile. The third one is based on the entropy theory and uses the maximum flow velocity occurring in the flow area. A sample of velocity measurements carried out at Pontelagoscuro gauged section (Po River, Italy), has been considered for the analysis. Six flood events have been selected and the accuracy of the investigated methods has been evaluated in terms of mean error in estimating both the mean velocity along each sampled vertical and the mean flow velocity. For high floods, the logarithmic law and the entropic approach were found quite accurate; however, the ability of the latter in reproducing the velocity profiles only by sampling the maximum flow velocity has been shown. Therefore, a procedure for velocity measurements based on the entropic approach has been proposed. The procedure allows one to both to shorten remarkably the time of the velocity sampling and to quickly estimate the discharge.
机译：当仅在流动区域的上部进行速度点采样时，研究了三种不同方法在高洪水期间评估速度剖面的准确性。前两种方法假设古典对数定律以及其他项，以考虑速度分布中的倾角现象。第三个基于熵理论，并使用在流动区域中出现的最大流速。分析中考虑了在Pontelagoscuro量表部分（意大利Po River）进行的速度测量的样本。选择了六个洪水事件，并根据平均误差评估了所研究方法的准确性，以估计沿每个采样垂直方向的平均速度和平均流速。对于高洪水，对数定律和熵方法被认为是非常准确的。然而，已经显示出后者仅通过采样最大流速来再现速度分布的能力。因此，已经提出了基于熵方法的速度测量过程。该程序既可以显着缩短速度采样的时间，又可以快速估计排放量。

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  • 来源
    《Nordic hydrology》 |2011年第3期|p.162-170|共9页
  • 作者

    Tommaso Moramarco; Carla Saltalippi; Vijay P. Singh;

  • 作者单位

    National Research Council,Research Institute for Geo-Hydrology Protection,via Madonna Alta 126,06128 Perugia,Italy;

    Department of Civil andEnvironmental Engineering,University of Perugia,06125 Perugia,Italy;

    Department of Biological and AgriculturalEngineering Texas A & M University Scoates Hall,2117 TAMU College Station,Texas 77843-2117,USA;

  • 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

    entropy; mean flow velocity; streamflow measurements; velocity profile;

    机译：熵;平均流速;流量测量;速度剖面;

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