Two coupled four-beam acoustic Doppler current profilers were used to provide simultaneous and independent measurements of the turbulent kinetic energy (TKE) dissipation rate ϵ and the TKE production rate P over a 36 h long period at a highly energetic tidal energy site in the Alderney Race. The eight-beam arrangement enabled the evaluation of the six components of the Reynolds stress tensor which allows for an improved estimation of the TKE production rate. Depth-time series of ϵ, P and the Reynolds stresses are provided. The comparison between ϵ and P was performed by calculating individual ratios of ϵ corresponding to P. The depth-averaged ratio ε/P averaged over whole flood and ebb tide were found to be 2.2 and 2.8 respectively, indicating that TKE dissipation exceeds TKE production. It is shown that the term of diffusive transport of TKE is significant. As a result, non-local transport is important to the TKE budget and the common assumption of a local balance, i.e. a balance between production and dissipation, is not valid at the measurement site. This article is part of the theme issue ‘New insights on tidal dynamics and tidal energy harvesting in the Alderney Race’.

中文翻译：

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通过耦合 ADCP 的测量评估高能潮汐流中的湍流动能收支

两个耦合的四波束声学多普勒电流剖面仪用于在奥尔德尼岛的一个高能潮汐能场 36 小时内同时独立测量湍动能 (TKE) 耗散率 ϵ 和 TKE 产生率 P种族。八束排列能够评估雷诺应力张量的六个分量，从而改进对 TKE 生产率的估计。提供了 ϵ、P 和雷诺应力的深度时间序列。ϵ 和 P 之间的比较是通过计算与 P 对应的 ϵ 的个别比率进行的。发现整个洪水和退潮的平均深度平均比率 ε/P 分别为 2.2 和 2.8，表明 TKE 耗散超过 TKE 产量。结果表明，TKE 的扩散传输项是显着的。因此，非本地传输对 TKE 预算很重要，本地平衡的常见假设，即生产和耗散之间的平衡，在测量地点是无效的。本文是主题问题“奥尔德尼岛竞赛中潮汐动力学和潮汐能收集的新见解”的一部分。