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长江口外的东海大陆架,是世界上最宽广的大陆架之一,它承受着中国最大河流——长江的巨大径流,同时,大量泥沙随径流进入陆架区,其中很大一部分泥沙沉积于图1中的Ⅰ_ο区,致使该区水下三角洲迅速演变发育,历史上曾从苏北而现在从渤海入海的黄河,也对本海区的沉积作用有很大的影响,这些沉积物对本海区沉积状况的演变起着很大的作用。沉积物现代沉积速率的测定,是河口陆架区沉积动力学研究的基本问题之一,为了更好地了解发生在河口陆架区现代沉积物表层的地质和化学过程,对海水-沉积物界面间的物质交换作出定量估价,有必要对不同沉积环境中现代沉积速率进行定量研究。另一方面,随着海洋环境污染研究的日益广泛与深入,了解河口陆架区现代沉积速率也变得越
The East China Sea continental shelf off the mouth of the Yangtze River is one of the most extensive continental shelves in the world. It withstands the great runoff from the Yangtze River, the largest river in China. At the same time, a large amount of sediment enters the shelf area with runoff. A large part of the sediment is deposited in Figure 1 The rapid evolution and development of the subaqueous delta in this area has greatly affected the deposition of the Yellow Sea from the northern Jiangsu Province and from the Bohai Sea into the sea at the present time. Play a big role. Sediment sediment deposition rate determination is one of the basic problems in the sediment dynamics of the estuary shelf area. In order to better understand the geological and chemical processes occurring in the surface sediments of the estuary shelf area, Quantitative exchange of material exchange, it is necessary to quantitatively study the deposition rate in different sedimentary environment. On the other hand, with the extensive and in-depth study of marine environmental pollution, it has become clear that the modern sedimentation rate in the estuary shelf area also becomes greater