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Activity and Formation of Sand Waves on Northern South China Sea Shelf

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【作者】 栾锡武彭学超王英民邱燕

【Author】 Luan Xiwu* Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China Peng Xuechao Guangzhou Marine Geological Survey, Ministry of Land and Resources, Guangzhou 510760, China Wang Yingmin Basin and Reservoir Research Center, Chna University of Petroleum, Beijing 102249, China Qiu Yan Guangzhou Marine Geological Survey, Ministry of Land and Resources, Guangzhou 510760, China

【机构】 Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of SciencesGuangzhou Marine Geological Survey,Ministry of Land and ResourcesBasin and Reservoir Research Center,China University of Petroleum(Beijing)

【摘要】 Sand waves on the northern South China Sea shelf had been considered as stable relict bed form. For the industry use of sea bed between stations LF13-2 and LF13-1, a new round of explorations were conducted. The newly obtained data show that both spacings and amplitudes of sand waves are all systematically changing with water depth. Repeated observations since 2003 to 2004 showed that the sea bed is currently active. Due to strong erosion of surface sediment since Dongsha (东沙) uplifting, there are almost no modern sediments on the shelf of Dongsha area. Sand materials in the study area mainly originate from the erosion of the bed sediment formation. The water depth increment revealed by repeated echo sounder data is mainly due to erosion. Bottom currents are quite complex in the area of Dongsha underwater plateaus. At site 9MKII, the southward ebb current is stronger than the northward flood current, while at site AEM-HR, the WNW-ward flood current is slightly stronger than the ESE-ward ebb current. At site 9MKII, the maximum bottom current speed is 48 cm/s, and 22% of the observed bottom current speeds are larger than 20 cm/s, which meet the minimum bottom current speed required for the creation of sand wave. This article points out that present-day oceanographic condition couples well with the sand-wave morphologies, and that the sand waves are to a great extent in equilibrium with the ongoing present-day oceanographic bottom current condition and active.

【Abstract】 Sand waves on the northern South China Sea shelf had been considered as stable relict bed form. For the industry use of sea bed between stations LF13-2 and LF13-1, a new round of explorations were conducted. The newly obtained data show that both spacings and amplitudes of sand waves are all systematically changing with water depth. Repeated observations since 2003 to 2004 showed that the sea bed is currently active. Due to strong erosion of surface sediment since Dongsha (东沙) uplifting, there are almost no modern sediments on the shelf of Dongsha area. Sand materials in the study area mainly originate from the erosion of the bed sediment formation. The water depth increment revealed by repeated echo sounder data is mainly due to erosion. Bottom currents are quite complex in the area of Dongsha underwater plateaus. At site 9MKII, the southward ebb current is stronger than the northward flood current, while at site AEM-HR, the WNW-ward flood current is slightly stronger than the ESE-ward ebb current. At site 9MKII, the maximum bottom current speed is 48 cm/s, and 22% of the observed bottom current speeds are larger than 20 cm/s, which meet the minimum bottom current speed required for the creation of sand wave. This article points out that present-day oceanographic condition couples well with the sand-wave morphologies, and that the sand waves are to a great extent in equilibrium with the ongoing present-day oceanographic bottom current condition and active.

【基金】 supported by the National Basic Research Pro-gram of China (973 Program) (No. 2007CB411702);the National Natural Science Foundation of China (Nos. 40572067, 40776032)
  • 【文献出处】 Journal of Earth Science ,地球科学学刊(英文版) , 编辑部邮箱 ,2010年01期
  • 【分类号】P736.1
  • 【被引频次】9
  • 【下载频次】173
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