海洋工程建设中周边海底地形变化是开展海岸工程开发建设的关键技术问题,有利于近岸海洋环境保护及资源开发利用.根据2011-2022年宁波梅山港区码头工程实测的4个航次的海底地形资料,分析了该工程施工前(2011年)、施工期(2016、2017年)和施工后(2022年)对周边海底地形的变化特征.结果发现:梅山港区码头工程实际测区海域共计淤积约163.8万m2,冲刷约196.3万m2,冲淤相抵后实际测区整体净冲刷约32.5万m2.总体来看,宁波梅山港区码头工程周边海域在该区域进行人为工程应尽量避免大幅度改变水动力条件,以至于影响周边海底地形,进而对周边海洋环境产生不利影响.
The changes in the surrounding seabed topography during ocean engineering construction are a key technical issue in the development and construction of coastal engineering,which is beneficial for the protection of the nearshore marine environment and the development and utilization of resources.This study analyzes the changes in the surrounding seabed topography before construction(2011),during con-struction period(2016 and 2017),and after construction(2022)based on the measured seabed topogra-phy data of four voyages of the Ningbo Meishan Port Terminal Project from 2011 to 2022.Research has found that the actual survey area of the Meishan Port Terminal Project has a total of approximately 1.638 million cubic meters of sedimentation and 1.963 million cubic meters of erosion.After the erosion and sedimentation offset,the overall net erosion in the actual survey area is about 325000 cubic meters.Over-all,when conducting artificial engineering in the surrounding sea area of the Ningbo Meishan Port Termi-nal Project,efforts should be made to avoid significantly changing the hydrodynamic conditions,which may affect the surrounding seabed topography and thus have adverse effects on the surrounding marine environment.