Directional Variations in Tidal Flow Multifractality and Intermittency

IF 3.3 2区 地球科学 Q1 OCEANOGRAPHY
Shyuan Cheng, Vincent S. Neary, Leonardo P. Chamorro
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Abstract

We explored distinct directional variations of multifractal and intermittent characteristics of ebb and flood flow velocities at nodule point, WA, tidal energy site, and complementary inspection on the East River, NY using scaling exponents of the structure function, distribution flatness, detrending moving average (DMA) analysis, multifractal detrended fluctuation analysis (MF-DFA), and high-order spectral moments. Our findings reveal that tidal flow presents higher long-range dependence (LRD) and intermittent levels for the ebb flow sections, whereas the flood flow sections exhibit a higher degree of multifractality and greater sensitivity to larger magnitude of turbulent fluctuations. We demonstrate that long-range dependence predominantly contributes to multifractal behavior in both ebb and flood flows, as evidenced by the significantly reduced multifractal spectrum width for temporally randomly permuted time series. Moreover, spectral kurtosis analysis uncovers a higher intermittent level across all frequency scales for ebb flow sections and reveals a distinct pattern of tidal flow intermittency differing from the monotonically increasing intermittent level observed in wall-bounded and grid turbulence. Finally, we demonstrate that DMA, MF-DFA, and high-order spectral moments provide more comprehensive insights than structure function scaling exponents and PDF flatness methods.

Abstract Image

潮汐流多分形和间歇性的方向性变化
利用结构函数的标度指数、分布平整度、去趋势移动平均(DMA)分析、多重分形去趋势波动分析(MF-DFA)和高阶谱矩分析,探讨了纽约州东河(East River, NY)的结节点、WA、潮汐能点和互补观测处退潮和涨潮速度的多重分形和间歇特征的明显方向性变化。研究结果表明,潮汐流在退潮段表现出更高的长期依赖(LRD)和间歇性水平,而洪水段表现出更高的多重分形程度,对更大的湍流波动更敏感。我们证明了在退潮和洪水中,长期依赖主要有助于多重分形行为,正如时间随机排列的时间序列显著降低的多重分形谱宽度所证明的那样。此外,谱峰度分析揭示了退潮剖面在所有频率尺度上的较高间歇水平,并揭示了与在壁面和网格湍流中观察到的单调增加的间歇水平不同的独特潮流间歇模式。最后,我们证明了DMA、MF-DFA和高阶谱矩比结构函数标度指数和PDF平坦度方法提供了更全面的见解。
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来源期刊
Journal of Geophysical Research-Oceans
Journal of Geophysical Research-Oceans Earth and Planetary Sciences-Oceanography
CiteScore
7.00
自引率
13.90%
发文量
429
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