Research on Environmental Comparison and Selection for Different Span Schemes of Sea-crossing Bridge

Environmental comparison and selection is an important measure to prevent and relieve adverse environmental impacts of construction project, and the comparison and selection of different span schemes is one of the priorities for environmental impact assessment of Sea-crossing bridge project. This research takes Shacheng Harbor Sea-crossing Grand Bridge as an example to forecast and evaluate the environmental impact of three types of different span schemes of 50m, 60m and 80m from four aspects including tidal flux change, diffusion of suspended sediment from construction, ship navigation and bridge pier occupation; meanwhile, it also considers the investment cost of different span schemes and puts forward the recommended scheme through comprehensive comparison and selection.