摘要
钦州湾鹿耳环江滨海公路和三墩公路两项工程的建设导致了海湾的整体形态发生改变,为研究海洋工程开发利用对海湾造成的影响,本文构建了2000年、2013年和2020年三期水动力模型并对各期水深数据进行了对比,对海湾的水动力分布及海底地形变化进行了量化分析,研究结果发现:①2004年滨海公路建成,造成周边过水通道产生明显的“集水效应”;②2010年三墩公路建成,鹿耳环江被整体“分离”,涨、落潮主导路线发生改变;③海湾内水体落潮时间增加,涨潮时间减少,潮位曲线形态发生改变;④2000年主导强潮流在麻蓝岛北侧沿NE—SW方向分布,2013年之后变为沿三墩公路S—N方向分布,三墩公路东西两侧海域流速整体特征发生改变;⑤强潮流通道与2m等深线位置的变化十分吻合,麻蓝岛东南侧流速的普遍增加导致0m等深线范围内发育形成新的过水通道;滨海公路路基间过水通道不断冲刷海底,原有深槽向东偏移;⑥麻蓝岛周边深槽均呈现“V”型,存在偏移或不断加深的态势;三墩公路东侧的冲刷导致新的深槽发育,整体呈现“V”型,南部靠近口门位置则为“W”型。本文研究结果有助于加深对该海域海洋开发利用所造成的影响程度的认识,了解海湾水动力特性的变化规律及海湾地形地貌未来可能的变化趋势,对于下一步科学合理地重塑鹿耳环江具有重要意义。
The constructions of the Coastal road and the Sandun road in the Luerhuan River of the Qinzhou Bay have caused the changes in overall morphology of the bay.In order to study the impact of the development and utilization of ocean engineering on the bay,hydrodynamic models for three periods of 2000,2013 and 2020 are established and the data of water depth in each period are contrasted.The distribution of hydrodynamics and the changes of seafloor topography in the bay are also analyzed quantitatively.The results reveal that the Coastal road constructed in 2004 has caused the surrounding water channels to produce obvious"catchment effect".The Sandun road constructed in 2010 has made the Luerhuan River"separated"integrally and the dominant route of rising and ebb tides changed.The duration of the ebb tide in the bay has increased,the duration of flood tide has decreased and the form of the tide level curve has been changed.The dominant strong tidal current flowed in a NE—SW direction at the northern side of the Malan Island in 2000 and changed to a N—S direction along the Sandun road after 2013.The overall characteristics of the tidal current velocities along both the eastern and the western sides of the Sandun road have changed.The channel of the strong tidal current is very consistent with the changes in the position of 2 m isobaths.The general increase of tidal current velocity at the southeastern side of the Malan Island has lead to the formation of new water passage within the range of 0 m isobath.The water passage between the roadbeds of the Coastal road erodes the seabed continuously and the original deep trough has shifted eastward.All the deep troughs around the Malan Island show a"V"shape and have a trend of offset and deepening.The erosion at the eastern side of the Sandun road has lead to the development of new deep troughs with a"V"shape on the whole,and close to the position of the entrance in the south"W"shaped troughs can be found.This study is helpful for deepening the understanding of the degree of impact caused by ocean exploitation and utilization in the study area and mastering the change law of hydrodynamic characteristics and the possible changing trend of the seafloor topography in the bay and is of great significance for reconstructing the Luerhuan River scientific and reasonably in the future.
作者
孙永根
黄沛
张志卫
吴頔
张栋
谭李春
SUN Yonggen;HUANG Pei;ZHANG Zhiwei;WU Di;ZHANG Dong;TAN Lichun(First Institute of Oceanography,MNR,Qingdao 266061,China;Key Laboratory of Coastal Science and Integrated Management,MNR,Qingdao 266061,China;Marine Consulting Center,MNR,Beijing 100161,China;Qinzhou Oceanic Bureau,Qinzhou 535019,China)
出处
《海岸工程》
2023年第3期263-276,共14页
Coastal Engineering
基金
科技部科技基础资源调查专项(2018FY100102)。
关键词
鹿耳环江
模型预测
流速变化
潮位变化
地形地貌
Luerhuan River
model prediction
change of current velocity
change of tidal level
seafloor topography Received:September 6,2022
