Observing eddy dye patches induced by shear instabilities in the surf zone on a plane beach

IF 1.4 3区 地球科学 Q3 OCEANOGRAPHY Acta Oceanologica Sinica Pub Date : 2024-04-30 DOI:10.1007/s13131-023-2270-y
Chunping Ren, Nannan Fu, Chong Yu, Yuchuan Bai, Kezhao Fang
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Abstract

The effects of surf zone eddy generated by alongshore currents on the deformation and transport of dye are still poorly understood, and related tracer release experiments are lacking. Therefore, a tracer release laboratory experiment was conducted under monochromatic, unidirectional incident waves with a large incident angle (30°) on a plane beach with a 1:100 slope in a large wave basin. A charge-coupled device suspended above the basin recorded the dye patch image. The evolution of eddy dye patch was observed and the transport and diffusion were analyzed based on the collected images. Subsequently, a linear instability numerical model was adopted to calculate the perturbation velocity field at the initial stage. The observation and image processing results show that surf zone eddy patches occurred and were separated from the original dye patches. Our numerical analysis results demonstrate that the structure of the perturbation velocity field is consistent with the experimental observations, and that the ejection of eddy patches shoreward or offshore may be ascribed to the double vortex.

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观测平面海滩冲浪区剪切不稳定性诱发的涡染斑块
人们对沿岸流产生的冲浪区涡流对染料变形和迁移的影响还知之甚少,也缺乏相关的示踪剂释放实验。因此,在大浪盆中,在坡度为 1:100 的平面海滩上,进行了单色、单向、大入射角(30°)入射波的示踪剂释放实验室实验。悬挂在水池上方的电荷耦合装置记录了染料斑块图像。根据收集到的图像,观测了涡状染料斑块的演变,并分析了其传输和扩散情况。随后,采用线性不稳定性数值模型计算了初始阶段的扰动速度场。观测和图像处理结果表明,冲浪区出现了漩涡斑块,并与原始染料斑块分离。我们的数值分析结果表明,扰动速度场的结构与实验观测结果一致,涡斑向岸上或离岸喷射可能是由双涡引起的。
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来源期刊
Acta Oceanologica Sinica
Acta Oceanologica Sinica 地学-海洋学
CiteScore
2.50
自引率
7.10%
发文量
3884
审稿时长
9 months
期刊介绍: Founded in 1982, Acta Oceanologica Sinica is the official bi-monthly journal of the Chinese Society of Oceanography. It seeks to provide a forum for research papers in the field of oceanography from all over the world. In working to advance scholarly communication it has made the fast publication of high-quality research papers within this field its primary goal. The journal encourages submissions from all branches of oceanography, including marine physics, marine chemistry, marine geology, marine biology, marine hydrology, marine meteorology, ocean engineering, marine remote sensing and marine environment sciences. It publishes original research papers, review articles as well as research notes covering the whole spectrum of oceanography. Special issues emanating from related conferences and meetings are also considered. All papers are subject to peer review and are published online at SpringerLink.
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