Numerical Study Of The Impact Of Lo-yang Bridge Construction On The Trend

The government of Shanghai City planned to build a deep-water port among Qiqu Isles in the Donghai Sea. For the purpose of the transportation between mainland and the port, a span-sea bridge, Luyang Bridge, was planned to be built. The overall length of the bridge is 27.2km, and the bridge piers, composed of steel piles and platforms, have resistance to the flow in some degree.The purpose of this dissertation is to research the effect of Luyang Bridge on the tidal current flooding and ebbing through Hangzhou Bay on macroscale. The researching method is, firstly, to create a flow field model which is testified to be reliable on a large area, and to research the variations of discharge entering and out-flowing from Hangzhou Bay; secondly, to simulate the discharge variation of main interest area near the bridge axis with a denser grid in a subarea of the coarse model. The resistance to the flow due to the bridge piers is modeled by calculating the equivalent bottom resistance which is measured through a physical model; lastly, the variations of the current velocity and discharge are presented before and after building the bridge.After numerical calculating and comparing the results, the model introduced in the research is proved to be correct, and the results are credible. It leads to the following main conclusion that Luyang Bridge to be built would not affect observably the characters of the current field in Hangzhou Bay.