Radial tidal current field in a semi-enclosed rectangular basin: formation and evolution -- Journal of Oceanology and Limnology,2015,33(4):1085-1099

	Cite this paper:
	QIAN Xuesheng, CHEN Yongping, ZHANG Changkuan, PAN Yi, DAS Himangshu. Radial tidal current field in a semi-enclosed rectangular basin: formation and evolution[J]. Journal of Oceanology and Limnology, 2015, 33(4): 1085-1099

Radial tidal current field in a semi-enclosed rectangular basin: formation and evolution

QIAN Xuesheng^1,2,3, CHEN Yongping^1,2, ZHANG Changkuan², PAN Yi²

1 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;
2 College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China;
3 Department of Civil and Environmental Engineering, Jackson State University, Jackson 39217, USA

Abstract:

The radial tidal current field accounts for the formation of the radial sand ridges in the South Yellow Sea. Understanding the formation and evolution of this radial tidal current field is vital to assessing the morphodynamic features in the area. A semi-enclosed rectangular basin with and without a coastal barrier was schematized from the topography of the Bohai Sea and Yellow Sea. The 2D tidal current field in this basin was simulated using the DELFT3D-FLOW model. The concept of tidal wave refraction, which highlights the effect of the sloped or stepped submarine topography on the propagation of the tidal waves, was introduced to explain the formation of the radial tidal current field. Under the effect of tidal wave refraction, co-phase lines of the counterclockwise rotating tidal wave and incident tidal wave are transformed into clockwise and counterclockwise deflections, respectively, leading to the convergence and divergence of the flow field. Regardless of whether a coastal barrier exists or not, the outer radial tidal current field might emerge over certain topography. The responses of the radial tidal current field in this basin to the environmental variations such as coastline changes and bottom erosions were discussed. Results show that local protrusion near the focal point of the radial tidal current field will have limited effects on the location of the tidal system. However, a remarkable shift of the amphidromic point toward the entrance and central axis of this basin and a movement of the focal point of the radial tidal current field toward the entrance could be caused by the significant seaward coastline advance and submarine slope erosion.

Key words: semi-enclosed rectangular basin|coastal barrier|M₂ tide|amphidromic point|radial tidal current field

Received: 2014-09-09 Revised: 2015-01-20

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Articles by QIAN Xuesheng

Articles by CHEN Yongping

Articles by ZHANG Changkuan

Articles by PAN Yi

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