摘要
在总结前人研究成果的基础上，结合３９个钻孔的岩相分析及１５０００年以来东中国海潮流系统演变的数值模拟结果，对江苏岸外潮流沙脊群发育的动力条件、物质基础、形成时代及演变过程进行了探计讨．结果表明，江苏岸外潮流沙脊群发育的主要动力，是以弓京港为波腹点（顶点）的辐合辐散的潮流系统．该潮流系统的形成，主要是由江苏海岸，尤其是山东半岛南岸岸线位置及轮廓决定的．潮流沙脊群开始发育的时间，比通常认为的要早，在１０，０００～８，５００年ＢＰ之间．物质来源要比原来想象的复杂得多．组成沙脊群的物质，实际上是潮流沙脊群分布区及其周围地区各种类型沉积物，以及在沙脊群发育过程中各种动力输入的物质的混合物．１０，０００年以来，随着岸线的变迁，潮流系统的不断调整．因而沙脊群也处在不断地调整变化中．不仅平面位置、分布范围有所变化，而且沙脊群平面形态，也发生过显著变化．南黄海的残留沉积区，不是海流作用的结果。
Discussions have been made on the developing process,dynamics,sand source and initiation age of the tidal sand ridges off the coast of Jiangsu province,Based on sedimentary facies analysis of 39 boreholes and simulations of tidal system developments for the last 15,000 years.The results show that the main dynamics for the development of the sand ridges is the tidal current system which is convergence off Qianggang and dependence on the location and outline of the coast line of Jiangsu province and the south Shandong peninsula.Initiation time of the tidal sand ridges is much more complex than it has been thought.In fact,it is the mixture of various sediments in and around the region of the sand ridges with the sands they were and are being brought into this region during the development of the sand ridges.Because of the coastline changes since the initiation of the sand ridges,the tidal current system has been experiencing a series of adjustments.Therefore,the sand ridges must have experienced a series of distructions,reconstructions and adjustments.Sedimentary sequence analysis and tidal current system simulations give some evidence to support those changes during the past 10,000 years.The sand exposure region between 30 and 60 m depth in southern Yellow Sea has been thought to be the result of erosion by ocean currents.But the ocean currents in southern Yellow Sea are too weak to erode the seabed.However,the tidal currents of southern Yellow Sea are strong enough to do that.Furthermore,the sand exposure regions in southern Yellow Sea match well with the distribution regions of the sand ridges in 10,000～8,500 years BP and surround the modern sand ridges.Therefore,the sand exposure of southern Yellow Sea is the result of erosion by tidal current,not by ocean current
出处
《南京师大学报（自然科学版）》
CAS
CSCD
1998年第3期95-108,共14页
Journal of Nanjing Normal University(Natural Science Edition)
基金
国家教委优秀青年教师基金
香港政府大学基金
国家自然科学基金
关键词
江苏
海岸
沙脊群
演变过程
潮流
形成机制
coast of Jiangsu Province,sand ridge,developing process,mechanism
