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跃层除有季节性的变化外 ,还时刻受到潮汐、风、降水等诸多因素扰动而引起波动与起伏。文章研究潮汐 (4大分潮M2 ,S2 ,K1,O1同时输入 )作用下渤海跃层起伏与波动的三维数值模型 (将海洋分为 3层 ,即上混和层 ,跃层和下混和层 ) ,揭示了整个海区跃层上下界面处跃层起伏的地理分布及叠加在起伏之上的潮周期波动的时空变化 ,模拟出跃层波动与实测基本一致。跃层波动既与潮汐运动有关 ,又与潮汐有很大区别。从波动位相、波高来看 ,两者均不相同 ,甚至周期有时也不同。跃层上下界面的波动周期、位相、波高在很多地区也不一致。中下层余流大小和方向几乎一致。大振幅的跃层波动均发生在近海地形突变之处。海水运动的激发与地形相互作用以及海岸海底摩擦可能是跃层波动与起伏的重要因素。
In addition to seasonal changes in the thermocline, it is also subject to fluctuations and fluctuations caused by disturbances such as tides, winds and precipitation at all times. This paper studies the three-dimensional numerical model of the sea level fluctuation and fluctuation in the Bohai Sea under the action of tidal wave (the simultaneous input of 4 large tidal pools M2, S2, K1 and O1) (dividing the ocean into 3 layers, that is, the upper mixing layer, the upper layer and the lower mixing layer) Reveals the geographical distribution of the upper and lower thermocline jumpers in the entire sea area and the spatial and temporal variations of the tidal cycles superimposed on the ripples. It is found that the fluctuation of the thermocline is basically consistent with the measured ones. The fluctuation of the thermocline is related to both the tidal movement and the tide. From the wave phase, wave height point of view, both are not the same, and sometimes the cycle is sometimes different. The fluctuation period, phase and wave height of the upper and lower interfaces of the thermocline are also inconsistent in many areas. The size of the lower middle stream and the direction of almost the same. Large-amplitude thermocline fluctuations occur at abrupt changes in the offshore terrain. The interaction between seawater motivation and terrain and coastal seabed friction may be important factors in the fluctuation and undulation of the thermocline.