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首页> 外文会议>International Conference on Fluvial Hydraulics Vol.2, Sep 4-6, 2002, Louvain-LA-Neuve, Belgium >A field study of transport and mixing in a river using an Acoustic Doppler Velocity Profiler
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A field study of transport and mixing in a river using an Acoustic Doppler Velocity Profiler

机译：声多普勒速度剖面仪在河流中运输和混合的现场研究

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摘要

A 3-D Acoustic Doppler Velocity Profiler (ADVP) is used for measuring closely spaced profiles across the river Poisine (on a straight river reach with mean water depth h ≈ 0.5 m, width B ≈ 12m, flat gravel bed with estimated D_(50) ≈ 6 cm). The mean streamwise velocity profiles show logarithmic profiles all across the half section, decreasing towards the bank. Most of the three turbulence intensities profiles between the center (y/B = 0.5) and y/B = 0.24 agree relatively well with laboratory profiles. Closer to the bank (y/B < 0.24) strong deviations in the profile form indicate "side-wall" effects. A cumulant discard method is applied and conditional statistics and conditional sampling are used to compare the experimental relative covariance contributions from the four quadrants. In the center (y/B = 0.5), all quadrant distributions correspond to those observed in laboratory open-channel flow. Near the bank (y/B = 0.04), significant differences between the results for different depths occur in all planes. Thus, the flow near the bank cannot be considered two-dimensional.
机译：3-D声学多普勒速度剖面仪（ADVP）用于测量Poisine河上间隔较近的剖面（在直河段上，平均水深h≈0.5 m，宽度B≈12m，平坦的砾石床估算D_（50 ）≈6厘米）。平均水流速度分布图显示整个半段的对数分布图，向河岸减小。中心（y / B = 0.5）和y / B = 0.24之间的三个湍流强度轮廓中的大多数与实验室轮廓相对吻合。靠近堤岸（y / B <0.24），轮廓形状中的强烈偏差表示“侧壁”效应。应用累积量丢弃方法，并使用条件统计量和条件采样来比较四个象限的实验相对协方差贡献。在中心（y / B = 0.5），所有象限分布对应于实验室明渠流动中观察到的分布。在堤岸附近（y / B = 0.04），在所有平面中，不同深度的结果之间存在显着差异。因此，堤附近的流动不能被认为是二维的。

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