According to the analyses, the North Channel is selution as the main deep-water navigation channel to the sea and is to be pre-trained, and the training principle of the Yangtze Estuary is determined.

在长期系统研究的基础上，分析对比了长江口的水流动力、泥沙运动和河床演变等各种条件，选择了北槽作为长江口深水航道先予治理，确立了符合长江口实际情况的治理原则。

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