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根据2008-2011年大连长兴岛海域近岸表层沉积物取样结果,分析表层沉积物的粒度分布特征,并利用GSTA模型分析了该海域的表层泥沙运移趋势。研究结果表明:研究海域的沉积物类型集中于砂、黏土质粉砂和砂质粉砂三种,砂主要分布在长兴岛的北侧和西侧以及葫芦山湾外湾-10m以浅水域,黏土质粉砂主要分布于高脑子角东侧近岸、葫芦山湾外湾-10m以深水域、葫芦山湾内湾以及西中岛西南侧近岸,砂质粉砂主要分布在董家口湾水域。研究海域的沉积物类型和粒度参数特征在横向上和纵向上均呈现不连续的分布特征,深水区以及较为隐蔽水域的分选程度都属中常或较差,而近岸开敞水域的分选程度则很好。GSTA模型计算结果显示,研究海域沿岸泥沙向岸横向输移趋势较明显,顺岸纵向输移趋势不明显,冬季波浪作用加潮流作用是研究海域泥沙输运的主要动力条件。
According to the sampling results of surface sediment near the coast of Changxing Island in Dalian from 2008 to 2011, the grain size distribution characteristics of surface sediments were analyzed. The trend of surface sediment transport in this area was analyzed by GSTA model. The results show that the sediment types in the study area are concentrated in three types: sand, clayey silt and sandy silt. The sand mainly distributes in the north and west of Changxing Island and the shallow waters of 10m in the outer gully of Bay, The silt mainly distributes in the east coast of the high brain corner, the outer waters of the outer Calashucawan bay of 10m-depth, the inner of the Gulf of Calashoy Bay and the southwestern side of the West Central Island. The sandy silt mainly distributes in the Dongjiakou Bay waters. Sediment types and grain size parameters in the study area showed discontinuous distribution both horizontally and longitudinally. The sorting degree of deep water area and subtle water area was moderate or poor, while the classification of open water area of nearshore The degree is good. The results of GSTA model show that the tendency of sediment transport to the coast is obvious, and the trend of longitudinal transport along the coast is not obvious. The effect of winter wave and tidal current is the main dynamic condition for the study of sediment transport in the sea.