Journal of Tropical Oceanography >
Impact of the coastal reclamations on topography evolution in the Qinzhou Bay, Guangxi
Copy editor: YIN Bo
Received date: 2022-04-21
Revised date: 2022-07-22
Online published: 2022-08-15
Supported by
Guangxi Key Laboratory of Marine Environmental Science, Guangxi Academy of Sciences(GXKLHY21-02)
National Natural Science Foundation of China(42171282)
National Natural Science Foundation of China(41930537)
Shanghai Pujiang Program(21PJC096)
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.
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 . DOI: 10.11978/2022087
图4 围垦前后流速对比: 涨急与落急时刻流场空间分布a. 1985年涨潮; b. 1985年退潮; c. 2020年涨潮; d. 2020年退潮 Fig. 4 Comparison of flow field before and after reclamation: the spatial distribution during flood maximum and ebb maximum |
表1 钦州湾1985年和2020年岸线长度和核心区围垦面积Tab. 1 The historical shoreline length and the reclamation area in the core area of the Qinzhou Bay in 1985 and 2020 |
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 |
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