Numerical Simulation Under Differenet Construction Mode On Sediment Concentration Of Yangcheng Lake

With China's entry into a high-speed railway rapid development phase, a growing number of high-speed railway will be built and put into use. The Beijing-Shanghai high-speed railway is as a milestone in China or even the world's high-speed railway field, it's not only the breakthrough of the running speed, but also should be eco-friendly. The study of Yangcheng lake about "concentration field" can give some guidance for other similar construction to find a eco-friendly way of construction scheme.Referencing the researches about water quality simulation, decide to use Delft-3D simulation model. Then comparing cofferdam mode and trestle mode about the sediment concentration on every construction stage with the original condition by Delft-3D, taking the water quality, lake terrain of Yangcheng lake and the meteorological information as the foundation. Finally, the result shows cofferdam mode cause the smaller environmental impact than the trestle mode, especially the onshore construction stage,it is almost no influence on sediment concentration.So, this article put forward the cofferdam construction scheme should be popularized to the similar project.Referencing the research results about Mathematics principle and parameter selection of the predecessors at home and abroad laid a good theoretical foundation.The water quality monitoring is not only reflect the background value of this field, but also make the simulation results have better comparability.