中文摘要：

针对夏季黄海内潮活动对水声信道的影响问题,提出了将表面潮流研究的最小二乘调和分析方法应用于黄海潮周期内波（内潮）的建模研究,并结合＂三层介质的海洋结构模型＂建立了黄海内潮满足的频散方程、群速度以及相速度表示.在此基础上数值分析了试验海区内潮对声传播影响的统计特征.研究结果表明,文中给出的内潮模型与观测数据相当吻合,并由此获得了黄海内潮的主要特征：海区潮周期内波占统治地位,M2内潮是造成等温线波动的主要因素;实测内潮位移在深度上的分布与其一阶简正模式相吻合;测量时间内,内潮的时间相关系数大于95%.

英文摘要：

In summer,an internal tide is a common event in the Yellow Sea,and it effects acoustic propagation.In this paper,the harmonic analysis method was applied to tidal currents to determine the tidal frequency of these internal waves in the Yellow Sea.A three layer ocean model was used as the basis of the frequency dispersion equation and to calculate the group speed and phase speed of the internal tide.Using the internal tide model,acoustic propagation through the internal tide was calculated.Some statistical characteristics of internal tide＇s influence on acoustic propagation were analyzed.Results showed the curves expected from the theory coincided with experimental results.Data showed internal waves with a tidal frequency dominate,and this lunar semidiurnal（M2） internal tide is the main cause of fluctuations of the isothermal line.Depth distribution of the internal tidal displacement was in agreement with the first order normal mode of an internal wave.During the experiments,the time correlative coefficient of the internal tide was larger than 95%.