Turbulence Measurements from Five-Beam Acoustic Doppler Current Profilers
Turbulence Measurements from Five-Beam Acoustic Doppler Current Profilers
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DOI：
10.1175/jtech-d-16-0148.1
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发表时间：
2017-06-01
影响因子：
2.2
通讯作者：
Thomson, Jim
中科院分区：
文献类型：
--
作者：
Guerra, Maricarmen;Thomson, Jim
两种新型的五波束声学多普勒电流测定仪——Nortek Signature1000 AD2CP和Teledyne RDI Sentinel v50——被用来测量华盛顿州普吉特海湾两个高能潮汐通道的湍流。通过分析湍流动能频谱、湍流空间结构函数、剖面剪切和协方差雷诺应力，验证了原始数据的质量。五梁结构允许直接估计沿梁速度波动的雷诺应力。Nortek的低多普勒噪声和高采样频率允许在频谱和湍流结构函数中观察湍流惯性子范围。用多普勒测速仪同步测量的湍流数据验证了五波束声多普勒电流剖面仪获得的湍流参数。然后将这些综合结果用于评估湍流动能收支，其中比较了湍流动能耗散和产量的深度分布。相关代码可在MATLAB文件交换网站上公开获取。
Two new five-beam acoustic Doppler current profilers-the Nortek Signature1000 AD2CP and the Teledyne RDI Sentinel V50-are demonstrated to measure turbulence at two energetic tidal channels within Puget Sound, Washington. The quality of the raw data is tested by analyzing the turbulent kinetic energy frequency spectra, the turbulence spatial structure function, the shear in the profiles, and the covariance Reynolds stresses. The five-beam configuration allows for a direct estimation of the Reynolds stresses from along-beam velocity fluctuations. The Nortek's low Doppler noise and high sampling frequency allow for the observation of the turbulent inertial subrange in both the frequency spectra and the turbulence structure function. The turbulence parameters obtained from the five-beam acoustic Doppler current profilers are validated with turbulence data from simultaneous measurements with acoustic Doppler velocimeters. These combined results are then used to assess a turbulent kinetic energy budget in which depth profiles of the turbulent kinetic energy dissipation and production rates are compared. The associated codes are publicly available on the MATLAB File Exchange website.