Measuring velocity and shear stress over dunes with acoustic Doppler profiler
Measuring velocity and shear stress over dunes with acoustic Doppler profiler
复制标题
使用声学多普勒轮廓仪测量沙丘上的速度和剪切应力
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
J. Best
中科院分区：
文献类型：
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作者：
R. Kostaschuk;P. Villard;J. Best
本研究评估了声学多普勒剖面仪(ADP)在河口沙丘上测量速度剖面的应用。ADP可以从移动的发射中展开，并提供可用于描述流动结构和提供剪切力的粗略估计的三维速度分布。建议采用二次应力模型来计算剪切应力，因为它们估计了表面摩擦力和形成应力，而墙体定律只能可靠地估计沙丘上的总应力。ADP最严重的限制是波束的几何形状，这导致靠近床层的采样直径很大，不能充分测量沙丘槽中的速度。
This study evaluates the use of an acoustic Doppler profiler (ADP) for measurement of velocity profiles over dunes in an estuary. The ADP can be deployed from a moving launch and provides three-dimensional velocity profiles that can be used to describe flow structure and to provide rough estimates of shear stress. Quadratic stress models are recommended for shear stress because they estimate skin friction and form stress whereas the law of the wall only reliably estimates total stress over dunes. The most serious limitation of the ADP is a beam geometry that results in a large sampling diameter close to the bed that does not adequately measure velocity in dune troughs.