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Discussion on the Genesis of the Yangtze Shoal

Author: HouZhiMin
Tutor: CaoLiHua
School: Ocean University of China
Course: Marine Geology
Keywords: Yangtze Shoal Topography features Causes Residual shore sand Modern trend role
CLC: P737.1
Type: Master's thesis
Year: 2010
Downloads: 57
Quote: 0
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Abstract


East China Sea shelf wide flat terrain, full of terrigenous sediment supply, rapid subsidence and strong dynamic field characteristics, is one of the world's most wide continental shelf. Yangtze Shoal is located in the northern part of the East China Sea shelf 30.7 ° N ~~ 32.6 ° N, 122.5 ° E to 125 ° E, water depth, slow slope, sediment supply is abundant and complex characteristics of ocean dynamic environment, in the process of sea-level rise, the trend mighty role is the main driving force for mass transport, its surface is widely developed in sandy sediments, China has studied the origin of many scholars from different angles, integrated Doctrine, there are two main points of residue deposition and modern trends deposition . In this paper analyzed the Yangtze Shoal southeast edge of the submarine bedforms characteristics and topography features based on the Yangzi shallows, is typical micro geomorphological features, explore the Yangtze Causes of Shoals. Project relying on the national 908-1-DX19, high-precision probe the SM2000 multibeam detection system on the southeast edge of the Yangtze Shoal, submarine bedforms characteristic of the region, and to explore the causes, the results showed that: \topography features of the region, and three large sand ridge between two grooves; the sand ridge top development erosion scarp, erosion ditch microrelief, three sand ridges at the top the microrelief is almost at the same depth , the top of the groove-39m; development gully erosion pit landforms. Region sand ridges direction inconsistent with the modern trend direction, sea level rise, the trend of erosion of the original sedimentary material, sand residual shore. Groove at the top of gully erosion pit landscape is formed by the trend in the process of erosion of sand ridges. Three sand ridges at the top of the shallow point in the ancient coastline on the development of erosion trenches, erosion scarp erosion caused by waves on the coastline, the residue of ancient shoreline geomorphology. Yangtze Shoal the shelf tidal sand ridges in the East China Sea and the northern Jiangsu shoal is formed in the process of sea-level rise, tidal sand ridge inheritance system. Two large sand ridges on the north side of the Yangtze Shoal area is relatively flat and steep south side, the development of a large number of flat sand waves in the sand ridge north side. Developed in the southern Yangtze Shoal sand ridges, the northern sand ridges development sandwaves this formation and evolution of the law in line with Belderson (1982) put forward the trend of geomorphology and tidal current velocity relationship in sea level rise in the standstill period, in the role of strong reciprocating trend , the formation is consistent with the direction of the ancient the trend NNW-SEE erosion - the accumulation of tidal sand ridges geomorphology. Comprehensive: the Yangtze Shoal sea level rise since the last glacial formed during the shelf residual sand, the surface is subjected to modern the trend momentum erosion transformation, and compatible with modern hydrodynamic environment.

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CLC: > Astronomy,Earth Sciences > Oceanography > Marine basic science > Marine geomorphology > Coastal landforms
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