九圩港铁路桥对通航与引排水影响的数值计算与分析

Influence of Jiuweigang bridge construction on the navigation,water diversion and drainage based on 2D numerical simulation

采用二维水动力数值模拟,计算桥梁修建前后的水流条件的变化,分析其对九圩港河道通航和引、排水的影响。计算结果表明:桥梁建设没有恶化通航水流条件,并满足通航净高要求,但在水位较低时无法满足通航净宽要求;桥梁建设引起的近岸流速的增大可能对近岸产生不利冲刷。采取疏浚清淤平顺岸线的改善措施以及护岸加固可以减小桥梁建设可能引起的不利风险。

This paper analyzes the influence on the functions for navigation, water diversion and drainage ofJiuweigang river caused by the construction of the proposed bridge by 2D numerical simulation model. The mainconclusions are： 1）The impact of the bridge construction on the navigable flow conditions would be minimal and thenavigable clearance height would meet the demand, but the navigable clearance width wouldn＇t meet the demandwhen the water level is low; 2） More attention should be paid to the safety of the right bank of the river for theincreasing flow velocity.The impact of the piers should be decreased by some optimized improvement measures.