基于数学模型的长江潮流界变化特性研究

长江下游河段受径流、潮流综合作用，水动力因素复杂。文章基于数值模型，结合径、潮流动力比的概念对长江潮流界的主要特性作了分析，研究了在不同径流、潮流条件下潮流界的变动特点，并根据江阴河段的模型计算结果分析了地形对径潮流动力分配的影响。结果表明径流对长江潮流界变化的影响范围比潮汐更大，且由于地形的差异，径潮比在同一断面中的浅滩部分小于深槽部分，即浅滩部分潮流动力相对更强。

Study on the change characteristics of the Yangtze River based on mathematical model

The lower reaches of the Yangtze River is affected by runoff and tidal current, the hydrodynamic factors are complex. Based on the numerical model, the main characteristics of the tidal current in the Yangtze River are analyzed based in view of concept of the combination of the runoff-tide dynamic ratio. The characteristics of the tidal current limit under different runoff and tidal current conditions are studied. Based on the results of the model calculation of the Jiangyin reach on influence of terrain on flow distribution. The results show that the influence of runoff on the tidal range of the Yangtze River is greater than that of the tide. Due to the difference of the terrain, the runoff-tide dynamic ratio is smaller than that of the deep trough in the same section, that is, the tidal power is relatively stronger in shoal .