Research On The Effect Of Hydrodynamic Environment Of Caused By The Sea-crossing Bridge

The cross-sea bridge already became important transport hub that communicating different cultures and promoting economy exchange more and more universal. The cross-sea bridges are usually longer,longspan and with complex structure, so the influence produced by bridge project which acts on marine environment and ecological entironment becomes emphasis in researching oceaneering. Now the main contents of research work are computing and analyzing the change of depth of water, the transformation of tidal wave, and effect between bridge and existing routes, etc., the difficulties lie in the vast sea area we will study, also the complicated, changeable landform and shoreline. Moreover, there're confluences of river, so the effect bring by runoff will not be ignored.The Lingding Yang which acts as traffic artery contents many islands, has complicated shoreline. This article puts the Lingding Yang as disquisitive background, and depends on the cross-sea bridge being built now - - the Hong Kong–Zhuhai–Macao Bridge. Basing on the analysis and summarizes of natural hydrodynamic force characteristics of Lingding Yang, two mathematical models are built, a large one and a part one. Through analog computation, it analyzes the influencing degree and scope to hydrodynamic force environment of Lingding Yang arising from bridge project.In the meantime, empirical equation and half-empirical equation are used to calculate the depth of local scour in every navigable bridge-opening and non-navigable span. Furthermore, it would discuss whether superfine bed material load can effect on results computed by formulas. On the other side, the text tries to probe the relation between the incident angle of flow and the depth of local scour by changing incident angle.Contraposing the artificial islands in bridge and tunnel structure of the cross-sea bridge, the article builds physical model to do experimental study, does researchandanalysis about the flow regime and scour around artificial island by means of vast test data.