洋山港海域与长江口相似性研究

SimilaritiesbetweenYangshanHarborSeaAreaandtheYangtzeEstuary

根据洋山港海域的水文泥沙观测资料和长江口的研究文献分析,洋山港海域与长江口存在较多相似现象。2者均存在滞流区现象是产生其它相似现象的根本原因,即高悬沙浓度区分布特征、表层沉积特征和浅滩区分布特征的相似性是滞流区现象的衍生效应。洋山港海域与长江口的诸多相似现象揭示:①滞流区的动力平衡作用是最大浑浊带和拦门沙浅滩形成的主导因素;②滞沙区通常位于滞流区地形束窄一侧;③滞流区的细颗粒物质沉积区与滞流点位置(或滞流区形态) 有着较为一致的吻合性。洋山港海域与长江口区同属于未来开发的热点地区,对2者的相似现象开展深入的研究将有着较深的理论和实际意义。

By analysing published papers on the Yangtze (Changjiang) estuary and hydrological and sedimentary data of Yangshan Harbor sea area, many similarities between Yangshan Harbor sea area and the Yangtze estuary are identified. These similarities indicate that: 1) Turbidity Maximums and mouth bars in estuaries are mainly caused by the hydraulic balance in the stagnating flow area of estuaries; 2) the accumulating area of sands caused by stagnating flow area is often located on the narrower side of the stagnating flow area; and 3) the location of fine sediments area caused by stagnating flow area is well identical with the location of the stagnating flow area. Both Yangshan Harbor area and the Yangtze estuary are the high developmental areas in the future. In-depth studies on these similarities between Yangshan harbor area and the Yangtze estuary will have theoretical and practical significance.