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长江口基本上属于部分混合型河口,外海盐水常呈楔状沿底部乘潮入侵。这种入侵盐水楔的端点即称为滞流点,它在河床底
The Yangtze Estuary basically belongs to the part of mixed estuaries. The salt water in the outer sea often shows wedge-shaped invasion along the bottom by the tide. The end of this invading salt wedge is called the stagnation point, which is at the bottom of the riverbed