长江口深水航道及横沙东滩促淤圈围对滞流点的影响

发布时间：2018-02-02 02:43

  本文关键词： 长江口 深水航道 横沙东滩 促淤圈围 滞流点 数学模型　出处：《同济大学学报(自然科学版)》2017年11期 　论文类型：期刊论文

【摘要】：滞流点位置的变化对河口拦门沙的形成和泥沙淤积具有极大的影响.基于MIKE3软件建立长江口水动力和盐度输运三维数学模型,采用实测资料对模型的潮位、流速、流向和盐度进行验证.运用验证好的数学模型模拟和分析长江口深水航道工程及横沙东滩促淤圈围工程对河口滞流点位置的影响,结果表明,(1)应用改进的近底层平均单宽通量计算公式确定滞流点的位置,验证结果良好,可以用该公式确定滞流点的位置;(2)深水航道工程的建设增大了水深和涨落潮流速,各汊道内落潮流量的增加明显高于涨潮流量的增加,且滞流点均向下游移动;(3)横沙东滩促淤圈围工程建成后,北港滞流点向下游移动约5km,北槽和南槽的滞流点则向上游移动约1km.
[Abstract]:The change of stagflation point position has great influence on the formation and siltation of estuarine barrier sediment. Based on MIKE3 software, a three-dimensional mathematical model of hydrodynamic and salinity transport in the Changjiang Estuary is established. The tidal level and velocity of the model were measured. The effects of Yangtze Estuary Deepwater Channel Project and Estuary silting Circle Project on the location of Estuary stagflation Point are simulated and analyzed by using the verified mathematical model and the flow direction and salinity of the Estuary are verified. 1) using the improved formula for calculating the average single wide flux near the bottom layer to determine the location of the stagflation point, the result is good, and the location of the stagnation point can be determined by the formula. (2) the construction of deep water channel increases the water depth and fluctuating tidal current velocity, and the increase of falling tide discharge in each branch is obviously higher than that of the rising tide flow, and the stagflation point moves downstream; 3) after the completion of the project, the stagnation point of Beigang moved about 5 km to the downstream, and the point of stagnation of the north channel and the south channel moved about 1 km to the upstream.
【作者单位】： 同济大学土木工程学院;
【基金】：国家“九七三”重点基础研究发展计划(2012CB957704)
【分类号】：TV148
【正文快照】： 近年来,长江口深水航道治理工程促进了长江航运业的发展,为长三角地区的经济快速发展提供了良好的条件,充分发挥了长江黄金水道的作用.随着经济的快速发展,土地紧缺的问题日益突出,横沙东滩促淤圈围工程正在紧锣密鼓地进行,从而有效地缓解上海市的土地压力,具有极大的经济和社，

本文编号：1483442