Sand wave migration near the southeastern corner of Martha's Vineyard, Massachusetts, USA

IF 4.3 3区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC ACS Applied Electronic Materials Pub Date : 2023-10-01 DOI:10.1016/j.ijsrc.2023.04.006
Vinícius Santos Pessanha , Peter Cheng Chu , Matthew Kenneth Gough , Peter Traykovski , Mara Morgenstern Orescanin
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Abstract

Sand waves of approximately 2 m in height were observed to migrate nearly 40 m with counterclockwise rotation between two bathymetric surveys performed three months apart near the southeastern corner of Martha's Vineyard, Massachusetts. The region is characterized by strong tidal currents, intermittent energetic surface wave events, and shallow water with local depth ranging from 2 to 7 m. This study uses the process-based model, Delft3D, with a three-dimensional approach to examine the sand wave dynamics by incorporating surface waves, winds, currents, and bathymetric observations. The model successfully simulates sand wave migration in comparisons to observations. Model sensitivity analyses show that the sand wave migration reduces by 65% with the absence of the surface waves. The modeled sand wave migration speed is correlated with the tidal current Shields parameter, and sharp increases in migration speed occur when the wave-driven Shields parameter increases in response to energetic surface wave events. The combined effect of tides, surface waves, and bathymetry is the origin of the rotational aspect of the sand wave, using the Shields parameter as an indicator of tidal currents and surface wave influence on sand wave dynamics.

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美国马萨诸塞州玛莎葡萄园东南角附近的沙波迁徙
在马萨诸塞州玛莎葡萄园岛东南角附近进行的两次测深测量中,观测到高度约为2米的沙波以逆时针方向移动了近40米。该地区以强潮流、间歇性强表面波事件和浅水为特征,局部深度为2 ~ 7 m。本研究使用基于过程的模型Delft3D,通过结合表面波、风、流和水深观测,采用三维方法来研究沙波动力学。该模型成功地模拟了与观测值相比较的沙波迁移。模型敏感性分析表明,在没有表面波的情况下,沙波的迁移减少了65%。模拟的沙波迁移速度与潮流Shields参数相关,且在高能表面波事件下,当波浪驱动的Shields参数增大时,沙波迁移速度急剧增加。利用Shields参数作为潮流和表面波对沙波动力学影响的指标,潮汐、表面波和水深测量的综合作用是沙波旋转方面的起源。
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CiteScore
7.20
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4.30%
发文量
567
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