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旧黄河口水下三角洲,是黄河在苏北夺淮入海期间形成的。本文根据历史资料及沉积钻孔等,揭示了这一水下三角洲的形成及演变过程,并对“五条沙”进行了论证。本文对水下三角洲所在海区的潮流及波浪动力进行了分析,提出了水动力强度平面分布的定量表示方法,并将这一分布图式与沉积物的抗冲性指标加以对比。据此指出,水下三角洲南北两侧的水动力作用强度有明显差别,从而对水下三角洲两侧海滩剖面特征及岸线夷平过程的特点,做出了动力学的解释。
The Yellow River mouth underwater delta, is the Yellow River in northern Jiangsu Huaihai into the sea formed. Based on historical data and sedimentary boreholes, this paper reveals the formation and evolution of this submarine delta and demonstrates “Wusha”. In this paper, the tidal current and wave power in the sea area where the submarine delta is located are analyzed, and a quantitative representation of the plane distribution of hydrodynamic strength is proposed. The distribution pattern of this model is compared with that of the sediment. It is pointed out that there is a significant difference in hydrodynamic strength between the north and south sides of the submarine delta, and a dynamic explanation is made of the characteristics of the beach profile and the shoreline flattening process on both sides of the submarine delta.