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基于ECOMSED模型建立了长江口地区潮流和泥沙输运数值模型。模型验证情况良好,能很好地模拟长江口地区水动力环境和泥沙浓度分布。利用所建模型,对长江口北支中束窄工程实施前后,长江口地区的水动力和泥沙浓度分布进行了模拟。研究结果表明:长江口北支中束窄工程实施之后,北支河道有较大程度的缩窄,北支径口也有较大程度的缩小,导致外海潮流对北支河道的侵入动力减弱,造成潮位降低,河道缩窄也使水流流速有所增加;北支河道内的泥沙浓度也随潮水侵入动力的减弱和潮位的降低而有所降低;北支中束窄工程仅对北支影响较大,南支及口门区域的潮位、流速、泥沙浓度基本不受影响。
Based on the ECOMSED model, a numerical model of tidal current and sediment transport in the Yangtze Estuary was established. The model verification is in good condition and can well simulate the hydrodynamic environment and sediment concentration distribution in the Yangtze Estuary. Using the model, the distribution of hydrodynamic and sediment concentrations in the Changjiang Estuary before and after the implementation of the north branch of the Yangtze River Estuary was simulated. The results show that after the implementation of the narrow beam of middle branch of the north branch of the Yangtze River Estuary, the Beipei channel has been narrowed to a large extent, and the diameter of the north branch channel has also been narrowed to a large extent, resulting in a weakened intrusion force of the offshore tide on the Bei Branch channel, resulting in The tide level decreased and the river narrowed also increased the flow velocity. The sediment concentration in the Beihai channel also decreased with the decrease of tidewater intrusion force and tide level. The influence of the north branch middle bundle narrowing project only affected the northern branch The tide level, velocity and sediment concentration of the big, the south branch and the mouth gate area are basically unaffected.