A novel approach for wave-turbulence decomposition

IF 4.5 2区 工程技术 Q1 ENGINEERING, CIVIL
Jianliang Lin , Chunyan Zhu , Jianwei Sun , Weiming Xie , Bram van Prooijen , Leicheng Guo , Qing He , Qingshu Yang , Zheng Bing Wang
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引用次数: 0

Abstract

Decomposing turbulence from waves remains challenging due to frequency overlap and wave-turbulence interactions. Existing decomposition methods, e.g., moving average, energy spectrum analysis, and synchrosqueezed wavelet transform (SWT), produce inconsistent turbulence estimates. Here, we introduce a rotating-coordinate-based method (RoCoM), founded on two assumptions: (1) the energy spectrum in the cross-wave direction remains unaffected by wave orbital velocities, and (2) wave-wise and vertical turbulence spectra are linearly proportional to the cross-wave spectrum, with proportional constants derived from frequencies higher than the wave-dominated frequency range. Both assumptions were validated with observational data collected from the Changjiang Estuary. Comparative analyses using both in-situ observations and controlled laboratory experiments show RoCoM avoids the energy trough problem inherent in the moving average and SWT methods, yielding the most accurate power spectra and turbulent kinetic energy (TKE) estimates. In-situ data reveal that the relative errors of RoCoM are approximately 16 % for total TKE and about 6 % for TKE within the wave-dominated frequency range. Laboratory experiments further confirm its superior accuracy, demonstrating relative errors of approximately 14 % for total TKE and about 7 % for wave-band TKE. RoCoM holds significant implications for marine material transport and coastal energy development by providing robust and precise turbulence and wave energy estimates. Nonetheless, its application is currently best suited for scenarios with predominant wave propagation from a single direction, while SWT remains advantageous in environments characterized by broader directional wave spreading.
波浪湍流分解的一种新方法
由于频率重叠和波-湍流相互作用,从波中分解湍流仍然具有挑战性。现有的分解方法,如移动平均、能谱分析和同步压缩小波变换(SWT),产生不一致的湍流估计。在这里,我们引入了一种基于旋转坐标的方法(RoCoM),该方法基于两个假设:(1)横波方向的能量谱不受波轨道速度的影响;(2)波浪方向和垂直方向的湍流谱与横波谱成线性比例,比例常数来源于高于波浪主导频率范围的频率。用长江口的观测资料验证了这两个假设。通过现场观测和受控实验室实验的对比分析表明,RoCoM避免了移动平均和SWT方法固有的能量槽问题,可以获得最准确的功率谱和湍流动能(TKE)估计。实测数据表明,在以波为主导的频率范围内,RoCoM的相对误差在总TKE上约为16%,在TKE上约为6%。实验室实验进一步证实了其优越的精度,表明总TKE的相对误差约为14%,波段TKE的相对误差约为7%。RoCoM通过提供强大而精确的湍流和波浪能估计,对海洋物质运输和沿海能源开发具有重要意义。尽管如此,它的应用目前最适合于主要波从单一方向传播的情况,而SWT在以更宽的定向波传播为特征的环境中仍然具有优势。
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来源期刊
Coastal Engineering
Coastal Engineering 工程技术-工程:大洋
CiteScore
9.20
自引率
13.60%
发文量
0
审稿时长
3.5 months
期刊介绍: Coastal Engineering is an international medium for coastal engineers and scientists. Combining practical applications with modern technological and scientific approaches, such as mathematical and numerical modelling, laboratory and field observations and experiments, it publishes fundamental studies as well as case studies on the following aspects of coastal, harbour and offshore engineering: waves, currents and sediment transport; coastal, estuarine and offshore morphology; technical and functional design of coastal and harbour structures; morphological and environmental impact of coastal, harbour and offshore structures.
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