河口水流是指浅海潮流进入河口与河川径流相互作用形成的水流，河口是河流与海洋的交接过渡地区，河口区上界是海洋作用和影响最终消失的地方，主要通过涨潮落潮流、涨潮涨潮流、落潮涨潮流和落潮落潮流来进行河口潮波的传播。一般在波峰的传播速度大于波谷。
基于河工模型的相似理论，从二维浅水方程推导出潮汐河口水流运动的相似条件。
Based on similarity theory of the physical model, the similarity condition of the current movement in the tidal estuary was deduced from the 2D shallow water equations.
针对河口水流运动特性，采用ADCP实测水流资料对长江口水流运动规律进行研究分析。
According to the characteristics of estuarine tidal current, its movement law in the Yangtze River Estuary is studied by analyzing measured data of water flow obtained from ADCP.
潮流和风生流都是浅海水流运动的基本形式，也是研究海岸河口水动力和环境问题的基本动力因素。
Tidal current is the essential dynamic condition in the coastal zone and estuary and the basic active factor also to study the water environment and ecology problem.
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