Headland tidal residual eddies in the area adjacent to the Sanggou Bay and their generation mechanism

ZHOU Wei; XUAN Jiliang; HUANG Daji

doi:10.3969/j.issn.1001-909X.2020.03.002

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Journal of Marine Sciences ›› 2020, Vol. 38 ›› Issue (3) : 10-20. DOI: 10.3969/j.issn.1001-909X.2020.03.002

Headland tidal residual eddies in the area adjacent to the Sanggou Bay and their generation mechanism

ZHOU Wei^1,2, XUAN Jiliang^*1,2, HUANG Daji^*1,2,3

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Abstract

The tidal residual current in the adjacent area of Sanggou Bay plays an important role in material transport. However, due to the lack of observation data, the overall spatial pattern of the tidal residual current in this area is still unclear. 22 sets of observational data and high-resolution numerical simulation data of the ocean current were used to analyze the overall spatial characteristics of tidal residual currents and to reveal its formation mechanism. The tidal residual currents within the Sangou Bay are generally weak, while in the areas near the three headlands (Lidao, Xunshan and Chushan), the tidal residual currents show significant pair of eddies. To the northern part of each headland, there is a cyclonic tidal residual eddy; while to the southern part of each headland, there is an anticyclonic tidal residual eddy. The pair of eddies near the headlands of Lidao and Chushan are much stronger and cover wider area than those of Xunshan. Dynamic diagnosis based on the residual vorticity equation shows that the tidal residual eddies are mainly induced by the horizontal shearing due to the lateral boundary friction, the bottom friction stress curl only affects the tidal residual eddies near the headland of Lidao, and the effect of potential vorticity conservation is not significant in the formation process of the all three pair of the tidal residual eddies.

Key words

Sanggou Bay / tidal residual current / long-term observation of ocean current / diagnostic analysis of eddies / model simulation

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ZHOU Wei, XUAN Jiliang, HUANG Daji. Headland tidal residual eddies in the area adjacent to the Sanggou Bay and their generation mechanism[J]. Journal of Marine Sciences. 2020, 38(3): 10-20 https://doi.org/10.3969/j.issn.1001-909X.2020.03.002

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