近百年来渤、黄、东海陆架冲淤作用强度数值研究

NUMERICAL STUDY ON MODERN EROSION/SEDIMENTATION INTENSITY ON THE CONTINENTAL SHELVES OF THE BOHAI SEA,YELLOW SEA AND EAST CHINA SEA

数值模拟了渤、黄、东海陆架区潮流动力场作用下9种无黏性单粒径泥沙的冲淤作用强度。计算所得渤、黄、东海陆架近百年来的冲淤分布与实测底质类型的分布在大多数海区相一致 ,这表明渤、黄、东海陆架的潮流动力场在该区的泥沙输运与淤积中起着主导作用 ,是该区近百年来冲淤作用强度分布格局的主要控制因素。

The study on modern erosion/sedimentation intensity on the continental shelves of the Bohai Sea, Yellow Sea and East China Sea (BYECS) can provide a model for material flux and cycling in global shelf areas, can help understand further sediment dynamics process and sedimentary environment evolution on continental shelves, and can provide sediment dynamics basis for relative branch of learning. In addition, this study is of important significance in the aspects of shipping, fishery, marine and coastal engineering, national defense and so on. The sea bed erosion/sedimentation intensities for 9 kinds of non cohesive single grain size are simulated under the action of M 2 tidal current on the continental shelves of the BYECS. The calculated distribution pattern of present sea bed erosion/accretion is consistent with that of field bottom sediment type in most areas of the continental shelves of the BYECS. This implies that tidal current field plays a dominant role in sediment transport and deposition, and is a main factor controlling the distribution pattern of present erosion/sedimentation intensity on the continental shelves of the BYECS.