Coastline changes and tidal current responses due to the large-scale reclamations in the Bohai Bay -- Journal of Oceanology and Limnology,2023,41(6):2045-2059

	Cite this paper:
	Zhe HUANG, Haijue XU, Yuchuan BAI, Fengshuo SHI, Zhichao WEN. Coastline changes and tidal current responses due to the large-scale reclamations in the Bohai Bay[J]. Journal of Oceanology and Limnology, 2023, 41(6): 2045-2059

Coastline changes and tidal current responses due to the large-scale reclamations in the Bohai Bay

Zhe HUANG^1,2, Haijue XU^1,2, Yuchuan BAI^1,2, Fengshuo SHI², Zhichao WEN²

1 State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China;
2 Institute for Sedimentation on River and Coastal Engineering, Tianjin University, Tianjin 300350, China

Abstract:

China’s Bohai Bay has experienced large-scale land reclamation since 2000. These reclamation projects create a nearshore ecological imbalance and shift sediment transport by changing the tidal current. However, these tidal current changes are not comprehensively understood. In this paper, the coastline changes in Bohai Bay due to reclamation are investigated and the responses of the tidal current are calculated through numerical methods. The results show that the coastline length of the bay increases by more than 500 km from 2000 to 2015 with the largest reclamation rate of 150.9 km²/a. Consequently, the current velocity changes with an uneven distribution near the reclamation due to construction masking and dike protrusion. The tidal symmetry also changes in most nearshore areas, with opposite variations in the current velocity at peak flood and ebb tide. In addition, the tide direction deflects to bypass the reclamation and is usually consistent with the coastline. Harmonic analysis of the dominant M₂ tidal constituent shows that the range of the reciprocating current is widely extended. The total influence of the reclamation can reach the -8-m isobaths in Bohai Bay. Changes in the tidal current are the main causes of water environment deterioration. Therefore, the arrangement and structural optimization of reclamation projects should be considered in the future.

Key words: Bohai Bay|reclamation|coastline|tidal current

Received: 2022-06-07 Revised:

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Articles by Zhe HUANG

Articles by Haijue XU

Articles by Yuchuan BAI

Articles by Fengshuo SHI

Articles by Zhichao WEN

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