Study And Analysis On The Environmental Effects Of Reclamation Resources In The Beaches Of Zhejiang Island

Zhoushan Islands is established.Re-enact the hydrodynamics of the Zhoushan Archipelago and calculate the response of sediment erosion and sedimentation to the implementation of the cofferdam project.The cofferdam project has led to a gradual increase in the degree of artificialization of the coastline of the Zhoushan Islands.The proportion of natural shoreline has been decreasing year by year;the total amount of tidal flat resources in Zhoushan has been basically stable under the interaction of cofferdam and tidal flat.The hydrodynamics of the cofferdam project to the nearby sea area include: the tidal level change in the reclamation area is less than 5cm,and the sea area in the calculated area tidal level change is less than 1cm;the proportion of the sea area where the tidal range change is greater than 2cm;the proportion of the flow rate is relatively less than 20%;Limited;local adjustment of the flow field in the sea area near the cofferdam project;the hydrodynamic effect of the cofferdam project on the nearby sea area is gradually weakened outward in the radial direction.The trend of the section of the Pushui Channel and the Lotus Ocean decreased after the cofferdam.By investigating the pollution source and comparing the diffusion of pollutants before and after the cofferdam,it is found that the cofferdam project has a weak influence on the water pollution spread in Zhoushan sea area.In the sea area,the scouring and silting shows that the former cofferdam caused the formation of silt in the middle part of the sinking channel,while the ant island and the north side of Dengbu Island formed a scour;the later cofferdam caused the siltation on the side of Lujiatun Island,between Lujiatun and Dengbu Island.The main channel area of the water channel is flushed.Through the study of the cofferdam project in Zhoushan sea area,the impact of project implementation on the resources and environment of the nearby sea area is analyzed,which provides reference for future engineering design and construction.