长江口北支中束窄工程对周边水动力及水质的影响

发布时间：2018-04-02 08:12

本文选题：长江口北支　切入点：MIKE　出处：《水运工程》2017年12期

【摘要】：基于考虑水体斜压的MIKE3数值模型的HD模块和Ecolab模块,对长江口及附近海域水动力环境进行数值模拟,并将验证好的模型用于分析预测实施北支中束窄工程对周边水动力环境造成的影响。研究结果表明:中束窄工程围填后,北支流速均有一定程度的降低,北支上段汊口处受到南支涨潮的影响,涨急流速有增大趋势;北支束窄工程对盐度的影响趋势为北支区域盐度值有明显的降低,对枯季北支的盐度倒灌南支起到了明显的控制作用;工程实施后,北支河口处磷酸盐、无机氮与叶绿素a含量增加明显;北支中上段磷酸盐与无机氮平均浓度略有降低,而叶绿素a含量整体有上升趋势。工程围填对南支及外海区域的水动力特征及营养盐含量影响较小。
[Abstract]:Based on the HD and Ecolab modules of MIKE3 numerical model considering baroclinic of water body, the hydrodynamic environment of the Changjiang Estuary and its adjacent waters is numerically simulated. The verified model is used to analyze and predict the effect of the mid-beam narrow project in the north branch on the hydrodynamic environment around the north branch. The results show that the velocity of velocity in the north branch decreases to a certain extent after the middle beam narrow project is filled. The upper branch of the northern branch is affected by the tidal current of the southern branch, and the rising velocity of the branch increases, and the influence of the narrow project of the northern branch beam on the salinity of the northern branch is obviously reduced. After the implementation of the project, the contents of phosphate, inorganic nitrogen and chlorophyll a in the estuary of the northern branch increased significantly, and the average concentration of phosphate and inorganic nitrogen in the middle and upper part of the northern branch decreased slightly. But the content of chlorophyll a is on the whole rising. The hydrodynamic characteristics and nutrient content of the south branch and the offshore area are less affected by the engineering filling.
【作者单位】：大连理工大学海岸和近海工程国家重点实验室;
【基金】：国家自然科学基金项目(51579030) 国家重点基础研究发展计划项目(2013CB430403)
【分类号】：TV148;X143

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