渤海海峡沉积物输运的数值模拟

MODELLING SEDIMENT TRANSPORT IN THE BOHAI STRAIT

根据渤海海峡空间尺度的大小、潮流特征和沉积物的性质特征 ,构造了一个平面二维沉积物输运数值模型。模拟结果显示 ,在研究区内 ,成山头附近的海底沉积物净输运向东南和东北 ,渤海海峡西部的沉积物向西北输运 ,北部大连沿岸的沉积物顺着辽东半岛向西南方向输运 ,然后绕过辽东半岛的南端向北输运。在渤海海峡中部偏东 ,沉积物的净输运趋势形成一个反时针方向的旋涡 ,愈往中心沉积物的净输运率值愈小。海底冲淤趋势的计算结果与观测的结果相符 ,且中部泥区和山东半岛北部近岸泥区正好对应于海底淤积区 ,辽东半岛南岸的狭长泥带对应于淤积条带 ,泥质区的边缘为冲刷区。

A 2 D horizontal numerical model is designed to study bed-load and suspended load transport over the Bohai Strait region, taking into account the characteristics of the tides and sediment distribution patterns. The results indicate that in the study area net sediment transport near Chengshantou (the sedimentation part of the region) is directed towards the southeast and northeast; in the western Bohai Strait it is towards the northwest, along the eastern coast of Liaodong Peninsula towards the southwest, and along the western coast of the Peninsula towards the north. In the eastern central Bohai Strait, the net sediment transport pattern is characterized by an anti clockwise eddy. The calculated patterns of seabed accretion/erosion are generally consistent with in situ observations. Furthermore, the central mud area and the coastal areas of Shandong Peninsula coincide with the accretional areas defined by the moel, and the narrow mud strip along the southern coast of Liaodong Peninsula also corresponds to the accretional areas according to the model output, with erosion occurring on the edge of the mud deposits.