Wave and turbulence measurements at a tidal energy site
Wave and turbulence measurements at a tidal energy site
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潮汐能站点的波浪和湍流测量
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Thomson
中科院分区：
文献类型：
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作者：
J. Filipot;M. Prevosto;Christophe Maisondieu;M. Le Boulluec;J. Thomson
这项工作提出了在潮汐能网站收集的波浪和湍流测量的分析。一种新的方法，介绍了产生更一致和严格的速度波动功率谱密度的估计。进一步提出了一个分析函数来拟合观测到的光谱，并可以输入到预测潮汐涡轮机的发电量和结构载荷的数值模型中。提出了一种新的方法来校正多普勒噪声对高频功率谱密度的影响。结合波浪和湍流贡献的速度时间序列的分析表明，湍流运动在整个水柱中是相干的，使得基于波浪相干性的方法不适用于我们的数据集。为了避免这个问题，另一种方法依赖于ADCP收集的压力数据的介绍，并显示出显着的改善波湍流分离。
This work presents the analysis of wave and turbulence measurements collected at a tidal energy site. A new method is introduced to produce more consistent and rigorous estimations of the velocity fluctuations power spectral densities. An analytical function is further proposed to fit the observed spectra and could be input to the numerical models predicting power production and structural loading on tidal turbines. Another new approach is developed to correct for the effect of the Doppler noise on the high frequencies power spectral densities. The analysis of velocity time series combining wave and turbulent contributions demonstrates that the turbulent motions are coherent throughout the water column, rendering the wave coherence-based methods not applicable to our dataset. To avoid this problem, an alternative approach relying on the pressure data collected by the ADCP is introduced and shows appreciable improvement in the wave-turbulence separation.