Research On The Influence Of The Sea-related Bridge Project On The Coastal Sea Environment And Countermeasures

At present,a large number of marine projects in China’s coastal provinces and cities have extended the human activities space and promoted the growth of the national economy.At the same time,they also caused many negative impacts on the marine environment surrounding the project,which led to the severe ecological environment in China’s coastal waters..The sea-related bridge project is an important part of ocean engineering.This paper takes the coastal Xiahe River Bridge project of Yantai City as an example to study the impact and countermeasures of the sea-related bridge project on the coastal water environment,and deeply analyzes and studies the existing research.The results and related historical data,analyzed and introduced the natural environmental conditions of the coastal area around the Jiahe Bridge project in this study area,focusing on the Jiahe Bridge project as an example to study the impact of the sea-related bridge project on the coastal waters environment.And a series of countermeasures are proposed for these effects.The main work of the thesis includes the following aspects:1)Organize the research status of domestic and foreign sea-related bridge projects and their impact on the marine environment,including the introduction of sea-related bridge projects,the status quo of sea-related bridge engineering at home and abroad,and the surrounding environment(including the marine environment)The relevant research status of the impact,the overview of the Jiahe Bridge project in Yantai City,etc.,and analyze the shortcomings.2)Overview of the study area’s natural environment.The natural environment of the research area obtained through field research and historical data analysis is described,including the natural environmental conditions such as meteorology,hydrology,topography,engineering geology and natural disasters in the study area.3)Research on the impact of sea-related bridge engineering on the coastal waters environment.Taking the Jiahe Bridge project as an example,the in-depth study on the impact of the sea-related bridge project on the coastal waters environment is carried out,including five aspects:(1)by introducing planar two-dimensional numerical models,setting computational domains and grids,establishing and verifying The tidal current numerical model,combined with actual observations,analyzes the pre-engineering tidal current calculation results,and numerically simulates the tidal current field after the completion of the project to study the impact of the sea-related bridge project on the hydrological dynamic environment of the coastal waters.(2)By introducing the water quality prediction model and simulating the location of the sediment occurrence point in the project construction phase,and finally predicting the concentration distribution of suspended sediment,and studying the impact of the project on the water quality environment.(3)By analyzing the migration trend of sediment in the offshore waters of the project and the influencing factors affecting the topography and the erosion and siltation environment,the numerical simulation of the landform and scouring and silting is carried out to study the topography and erosion and sedimentation environment of the nearshore waters.Impact.(4)Qualitative analysis and research on the impact of the project on fishery production and fishery resources,including:the impact of project construction on fishery production and fishery resources,and the impact of construction noise on fishery resources.(5)Qualitative analysis and research on the impact of suspended sediment on the marine ecological environment,including the effects of suspended sediment on plankton,swimming organisms and benthic organisms.4)Research on the countermeasures of the sea-related bridge project on the environmental impact of coastal waters.Based on the research results of the above-mentioned sea-related bridge project on the coastal water environment,the Jiahe Bridge project is taken as an example to study the countermeasures and measures for the above-mentioned effects,including the planning and management methods of the marine functional area,and the marine ecological protection measures for the project.To prevent the occurrence of man-made accidents such as storm surge accidents,failure of cofferdams during construction period,collision of bridge piers during operation period,collision of dangerous goods in operation period,and damage to the marine environment,and strengthen the management of sea area use,completion acceptance management,Management measures such as environmental impact tracking,monitoring and management will effectively reduce the impact and damage of the Jiahe Bridge project on the coastal environment and ecology.