射阳港近岸海域沉积物特征及冲淤趋势

Study of sedimentary characteristics and the erosion and deposition trend in the nearshore of Sheyang Port

海岸是陆地与海洋相互接触和影响的地带,通常指受波浪和潮汐等海洋动力作用的沿岸地带,同时也是人类社会经济发展的重要地带,大型人类工程往往会对其短期地貌变化和沉积物特征产生巨大影响。沉积物粒度分析是研究海洋沉积作用及过程的一个基础的、重要的方法,通过射阳港海岸动力地貌调查,研究了射阳港区不同时期的水下沉积物分布特征,将不同历史时期海图的等深线对海床冲淤变化进行对比分析,认为双导堤完工后导堤口区域出现了明显冲刷,导堤两侧出现淤积,沉积物颗粒变细,表明港口工程等局部影响因素会在短期内显著改变水动力地貌。

The coast is the area where land and ocean meet and influence, affected by the ocean dynamics such as waves and tides. It is also an important area of human social and economic development. Large-scale human engineering usually has a strong influence on the short-term morphological and sediment characteristics in the coastal zone. Sediment grain size analysis is a basic and important method to study marine sedimentation. By a coastal dynamic geomorphologial survey of the nearshore of Sheyang Port, it studied the distribution characteristics of underwater sediments in different periods in Sheyang Port area, as well as the depth contour and the deposition changes of the sea in different historical periods. It suggests that the seabed near the mouth of jetty was significantly eroded, and there was siltation on both sides of the jetty, and the particles became fine. The study reveals that local influencing factors such as port engineering can significantly change the hydrodynamic geomorphology in a short time.