芦洋跨海大桥建设对潮流影响的数模研究

【作者】 孙志国；

【导师】 邱大洪； 孙昭晨；

【作者基本信息】 大连理工大学 ， 港口、海岸及近海工程， 2003， 硕士

【摘要】 上海市政府规划在东海中部崎岖列岛的大小洋山建设深水港，为解决陆上与港口之间的交通问题，拟在芦潮港与大小洋山之间修建跨海大桥。整个桥长27.2km，桥墩由钢桩和承台组成，对水流有一定的阻力作用。 本课题的研究目的是从宏观流场研究芦洋跨海大桥建设方案对进出杭州湾的潮流产生的影响。研究方法是首先建立大范围的可靠适用的流场数值模型，研究进出杭州湾的流量变化；然后对感兴趣的区域嵌套加密网格，利用桥墩物理模型测定的等效底摩阻系数，研究建桥前后在桥轴线上的流速、流量变化。 经过数值计算及对计算结果的比较分析，研究采用的数值模型合适，结果可靠。可以得出以下主要结论：芦洋跨海大桥的建设对杭州湾潮流场的影响不大，不会影响整个杭州湾的潮流场特征。更多还原

【Abstract】 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.更多还原