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目前,长江口北槽深水航道上段淤积较为严重,对航运产生了不利的影响。本文利用Delft3D-FLOW建立了长江口二维潮流的数学模型,并利用实测潮位、流速及流向资料对模型进行了率定和验证,模型计算结果与实测数据符合较好,该模型较好地反应了深水航道工程后长江口的水动力情况。根据模型计算结果,特别是南、北槽上河段主河道流速沿程变化过程、横沙通道涨落潮流量、南北槽分流比,对北槽深水航道上段淤积原因进行了分析,北槽沿程流速远小于南槽沿程流速,尤其横沙通道以上北槽河段流速更小,而且横沙通道涨、落潮量均较大,削弱了北槽和南港之间的水体交换,从而加强了泥沙在北槽深水航道上段进口段的落淤。
At present, siltation is more serious in the upper reaches of the deep channel of the north channel of the mouth of the Yangtze River, adversely affecting shipping. In this paper, we use Delft3D-FLOW to establish the mathematical model of the two-dimensional tide flow in the Yangtze River estuary. The tidal current, velocity and flow data are used to calibrate and validate the model. The calculated results are in good agreement with the measured data. Hydrodynamics of the Yangtze Estuary after the Deepwater Channel Project. According to the results of model calculation, especially the variation of the flow velocity of the main channel in the upper reaches of the South and North Troughs, the fluctuating flow of the Hengsha channel and the diversion ratio of the North and South channels, the reasons for siltation in the upper channel of the North Channel are analyzed. The flow velocity is far less than that of the south channel. In particular, the velocity of the north channel above the Hengsha channel is smaller and the channel of the Hengsha channel is larger and the ebb is larger, weakening the exchange of water between the north channel and the south port, thus strengthening the mud Sand in the North Channel deepwater channel upper section of the import silos.