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中文摘要：
建桥后桥墩会干扰桥区水流的流动,进而对桥区通航产生不利影响。为了保证桥区通航安全,有必要了解建桥前后桥区水流的变化情况。数值模拟方法是桥梁设计阶段分析建桥前后桥区水流变化及其对通航影响的一种有效方法。以长江河口地区为例,通过桥区水流数值模拟分析建桥对通航的影响。首先建立了长江河口段的江阴至青龙港（北支）、杨林（南支）河段的二维有限元水动力数学模型,并用实测的潮位和流速资料对模型进行了验证;随后以苏通大桥为例建立桥墩模型进行数值模拟,从建桥前后流速和流向的变化两方面分析了建桥对通航的影响,并计算了通航影响宽度。算例结果表明所采用的数值模拟方法及其软件具有工程实用性,可用于分析建桥对通航的影响。
英文摘要：
Flow in bridge area is disturbed by bridge piers,which has negative impacts on navigation.In order to ensure navigation safety in bridge area,it is necessary to know the flow changes before and after bridge construction.In bridge design stage,numerical simulation is an effective method to analyze flow variation and its impacts on navigation.By taking the Yangtze River Estuary as an example,the analysis of bridge construction effects on navigation in bridge area is carried out.A 2-D finite element mathematical model of the estuary section is established and validated by comparing numerical results with actually measured data of tide levels and flow velocities.Then,pier models of Sutong Bridge are introduced for numerical simulation.Based on simulation results,the influence of bridge construction on navigation is analyzed in the changes of both flow velocity and direction,and the navigation influence width is calculated.It is indicated by simulation results that the adopted methods and software are practically useful for analysis of bridge construction influence on navigation in bridge area.
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