Turbulence Measurements in Simulated Tidal Flow
Turbulence Measurements in Simulated Tidal Flow
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DOI：
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发表时间：
1980-08
影响因子：
2.4
通讯作者：
H. Anwar;R. Atkins
中科院分区：
文献类型：
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作者：
H. Anwar;R. Atkins
潮流的现场测量表明，与加速时相比，潮流减速时的湍流参数(湍流强度、雷诺应力、湍流扩散系数和输沙率)都有所增加。通过一系列实验研究了非定常流动对湍流特性的影响。长水槽中的水流在相同的时间段内先加速后减速。测量了三个方向的瞬时流速分量、水面坡度和床面剪应力。根据测量数据确定了平均速度分布、时间和空间雷诺应力分布以及能谱。在可能的情况下，将结果与现场测量结果进行比较。
Field measurements of tidal flow have shown that there is an increase in turbulent parameters (turbulent intensity, Reynolds stress, coefficient of turbulent diffusivity, and the rate of sediment transport) when the flow is decelerating as compared with when it is accelerating. A series of experiments were conducted to study the effect of unsteady flow on turbulence characteristics. The flow in a long flume was accelerated and then decelerated for the same periods of time. Instantaneous velocity components in three directions, water surface slope, and shear stress at bed were measured. From measured data mean velocity profiles, temporal and spatial Reynolds stress profiles, and energy spectra were determined. The results were compared, wherever possible, with those obtained from field measurements.