前言河道中海水入侵长度达到最大是在迳流量小的时候,准稳定状态盐水楔不断发展的情况是在大潮时,而非稳定状态分层流动最发达的状态是从小潮之后到申潮时。本文叙述此类盐水楔运动的数值计算法。在河道中盐水楔运动的特征就在于一维性与河道条件起因的复杂性。首先内部交界面的纵向变化显著;同时,随着外力变化能出现不稳定的各种大规模内部涡旋,它们除了在运动体系内部提供基本条件外,还影响到中间层发展,混合与能量消耗等现象。此外,在上层还 Foreword The length of seawater intrusion reaches the maximum. When the flow rate is small, the steady development of quasi-steady salt wedge is at tidal wave, while the non-steady-state stratified flow is the most developed state after the tide of low tide. This paper describes the numerical calculation of such salt wedge motion. The characteristics of salt water wedge movement in the river are the one-dimensional nature and the complexity of the cause of the river conditions. First of all, the longitudinal variation of the internal interface is significant. At the same time, various large-scale internal vortices, which are instable with the external force, can not only provide the basic conditions inside the motion system, but also affect the development of the middle layer, mixing and energy consumption And so on. Also, at the top also