海岸线围垦对广西钦州湾地形演变的影响分析

doi:10.11978/2022087

Abstract

Abstract:

The Qinzhou Bay in Guangxi province is an important estuarine bay in south China. With recent intensive engineering construction and coastal reclamations, the topography evolution of the Qinzhou Bay is changed, which may influence the port shipping and shoreline stability. Based on two sets of coastline and underwater topographic data, we developed a coupled hydrodynamic-sedimentary dynamic numerical modelling system to simulate the impact of human activities on the dynamics of underwater topography evolution of the Qinzhou Bay in the past 35 years. Our results show that the reclamations optimize the spatial distribution of the flow field by slightly increasing the tidal flow velocity in the Longmen waterway and the outer bay; meanwhile, the reclamations changed the tidal asymmetry distribution, which may affect the development trend of the channel-beach pattern and the local erosion and deposition, mainly in the area of the northern Maowei Sea, the Longmen waterway, the middle of the outer bay, and around the Sandun Highway; moreover, the coastal reclamations had overall weakened the underwater geomorphology change of the Qinzhou Bay, and slightly increased the changes in the central Longmen waterway, but the spatial distribution of the change is more concentrated. The magnitude of change in the outer bay area decreased slightly, the trend of change was concentrated in the eastern and western waterway, while the change in the central waterway tended to be stable. Overall, maintaining a stable topography of the Qinzhou Bay is of great importance for the sustainable development of port shipping and coastal zone economy in the future.

Key words: sedimentary dynamics, numerical simulation, coastal reclamation, Maowei Sea

ZHANG Min, WU Hangxing, LU Yibin, LU Diwen, MI Jie, ZHU Donglin, CHEN Bo. Impact of the coastal reclamations on topography evolution in the Qinzhou Bay, Guangxi[J].Journal of Tropical Oceanography, 2023, 42(2): 124-131.

Figures/Tables 7

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References 22

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时间	岸线长度/km	时间	地点	围垦面积/km²
1985年	425	1992年	钦州港港区	10.09
2020年	525	2008年	保税港区	26.15
		2009年	三墩公路	3.18

Impact of the coastal reclamations on topography evolution in the Qinzhou Bay, Guangxi

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