唐山港京唐港区泥沙运动特征与海岸性质界定

The definition of Jingtang port sediment movement characteristics and the nature of the coast

海岸性质的界定,是港口航道减淤措施合理布置的关键。通过地形资料和现场测量资料对京唐港区的水下地形地貌特征、泥沙特性以及沿岸输沙特点等进行了分析研究。研究结果表明,京唐港区泥沙中值粒径大于0.06 mm、沉积物中黏土含量小于15%、岸滩坡度通常大于1/1 000;泥沙运动具有沿岸泥沙运动特征,但与沙质海岸又有所不同,存在复合沿岸输沙,尤其在风暴潮期间,大浪产生的破波沿岸流与风暴潮潮流叠加,产生更为强烈的沿岸输沙能力。在粉沙质海岸定义基础上,将京唐港区海岸界定为细沙粉沙质海岸。在京唐港区航道防波挡沙堤布置上考虑复合沿岸输沙,取得良好效果。

The definition of the coastal nature is the key to apply the reasonable sedimentation reduction measures. The measured data of all previous underwater topography and bottom samples, and sediment transport characteristics in Jingtang area were studied. The results show that the grain diameter of the sediment in Jingtang area is larger than 0. 06 mm, the clay content in the sediment is 矣 15%,and the beach slope is usually more than 1/1 000. The sediment movement has the characteristics of moving along the coast, but it is different from that in the sandy coast. And there is a composite longshore sediment transport, especially during the storm tide, when the wave-breaking coastal flow and the storn tide are superimposed, which produces a more strong longshore sediment transport rate. On the basis of the definition of silty-sand coast, the coast of Jingtang area is defined as sandy-silt coast. The composite longshore sediment transport is considered in the layout of the breakwater in the Jingtang area, and good results are obtained.