中国陆架潮流沉积体系和模式

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在1991年中法合作渤海潮流沉积研究的基础上,查阅了国内外有关研究成果,分析了中国陆架的水深地形、沉积地貌与潮流动力的关系,认为潮流对中国陆架的海底地貌和沉积的形成发育起了主导作用。当潮流流速大于3节时,潮流的侵蚀作用是主要的,往复潮流多形成冲刷深槽,大大刷深了海峡或水道。当潮流流速1-3节时,潮流的沉积作用是主要的,多形成浅滩,即潮流沙脊和潮流沙席。以M2分潮椭率绝对值0.4为界,大于0.久者意味着潮流旋转性强,多形成潮流沙席;小于0.4者意味着潮流往复性强,多形成潮流沙脊。提出了我国邻近陆架发育了5个现代潮流沉积地貌体系:(1)黄海东部潮流沉积体系,它由西朝鲜湾潮流沙脊和其南部的沙席两者组成;(2)渤海东部潮流沉积体系,它由老铁山水道冲刷槽,辽东浅滩沙脊和渤中浅滩沙席三者组成;(3)长江口外潮流沉积体系,它由江苏滨外潮流沙脊和长江口浅滩潮流沙席组成;(4)台湾滨外潮流沉积体系,它由台湾海峡冲刷槽、台湾浅滩沙脊、澎湖水道冲刷槽和台中浅滩沙席四者组成;(5)琼州海峡潮流沉积体系,它由琼州海峡冲刷槽、东浅滩沙脊和西浅滩沙脊三者组成。此外,在东海陆架上还有冰后期海侵早期形成的残留潮流沉积体系。全新世陆架浅海潮流沉积模式可分海峡一浅? Based on the study of tidal current deposition in Sino-French cooperation in the Bohai Sea in 1991, the author reviewed the relevant research results at home and abroad, analyzed the relationship between water-depth topography, sedimentary landform and tidal momentum in the continental shelf of China, and considered the trend of seafloor landform and sedimentary formation in China’s continental shelf Development played a leading role. When the tidal velocity is more than 3 knots, the erosion of the tidal current is the main one. The reciprocating tidal current mostly forms the scouring deep groove, and greatly brushes the strait or waterway. When the tidal velocity is 1-3 knots, the sedimentation of the tidal current is dominant and the formation of shallow tides, that is, the tidal current and the current tidal sand. To M2 tidal oval absolute value of 0.4 as the boundary, greater than 0. For a long time means that the trend of rotation is strong, and more to form tidal sand seat; less than 0.4 means that tidal flow is strong and strong, the formation of tidal current sand ridge. It is proposed that five modern tidal sedimentary landscape systems are developed in the adjacent continental shelf: (1) the tidal current sedimentation system in the eastern Yellow Sea, which consists of the tidal current sand ridge in the North Korea Gulf and its southern sand platform; (2) the tidal current sedimentary system in the eastern Bohai Sea , Which consists of Laotieshan channel scouring trough, Liaodong shoal sand ridge and Bozhong shoal sand table; (3) The tidal current sedimentary system outside the Changjiang Estuary, which is composed of tidal flats sand bar on the coast of Jiangsu and the Yangtze Estuary; (4) Taiwan offshore tide deposition system, which consists of the Taiwan Strait scouring trough, Taiwan Shoal sand ridge, Penghu waterway scouring trough and Taichung Shallow sand table four; (5) Qiongzhou Strait tidal sedimentation system, which consists of Qiongzhou Strait scouring trough , The east shoal sand ridge and the west shoal sand ridge composed of three. In addition, there are residual tidal sedimentation systems formed on the shelf of the East China Sea in the early stage of ice transgression. Holocene Shelf shallow-sea tidal sedimentation model can be divided into a shallow channel?
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