南京河段拟建过江隧道河段河床冲刷数值模拟  

Numerical simulation of river bed erosion for the proposed river-crossing tunnel under Nanjing reach

作　　者：王华 曹双 于洋 罗锋 WANG Hua;CAO Shuang;YU Yang;LUO Feng(Lower Changjiang River Bureau of Hydrological and Water Resources Survey,Nanjing 210011,China;College of Harbor Costal and Offshore Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]长江水利委员会长江下游水文水资源勘测局,江苏南京210011 [2]河海大学港口海岸与近海工程学院,江苏南京210098

出　　处：《水运工程》2019年第11期67-73,共7页Port & Waterway Engineering

基　　金：江苏省海洋科技创新专项(HY2018-1、HY2017-2)

摘　　要：通过分析近年来河流演变特征和拟建工程河段水沙特征,综合考虑长江下游南京河段水沙运动规律、三峡水库蓄水后沙量的变化以及对河床冲淤影响较不利的水文年,确定了具有代表性的模型计算水沙控制条件和不利水沙条件。结合实测资料,采用二维潮流泥沙数学模型,对长江下游南京河段拟建建宁西路过江隧道附近区域的潮流及含沙量进行模拟及验证。在验证良好的基础上,对工程河段各方案(A、B、D、E)的河床冲淤进行了预测,并与物理模型试验结果进行对比分析。结果表明:两种模型计算结果较为一致;拟建过江隧道各方案冲刷变化基本相似,其中E方案左、右深槽冲刷深度最小,可为过江隧道工程的合理实施提供科学依据。Based on the analysis of the characteristics of river evolution and water and sediment in the proposed river section in recent years,and taking into account the law of water and sediment movement in the Nanjing reach of the lower Yangtze River,the variation of sediment volume after the impoundment of the Three Gorges Reservoir and the hydrological years that have adverse effects on the erosion and siltation of the river bed,representative models are established to calculate the water and sediment control conditions and unfavorable water and sediment.Combining with the measured data,a two-dimensional tidal current and sediment mathematical model is used to simulate and verify the tidal current and sediment concentration in the vicinity of the proposed Ningxi Road river-crossing tunnel in Nanjing Reach of the Lower Yangtze River.On the basis of the good verification,the river bed erosion and deposition for engineering of each scheme(A,B,D,E)is forecasted and compared with physical model test results.The results show that the calculated results of the two models are quite consistent;the scouring changes of the proposed cross-river tunnel schemes are basically similar,and the scouring depth of the left and right deep grooves of the E scheme is the smallest,which can provide a scientific basis for the reasonable implementation of the cross-river tunnel project.

关 键 词：河道演变 过江隧道 数学模型 水沙条件 冲刷深度预测 

分 类 号：U612[交通运输工程—船舶及航道工程] U452[交通运输工程—船舶与海洋工程]