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《Chinese Journal of Geophysics》 2018-03
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Discovery of the reticular sand dunes in the Dongsha region of South China Sea and their genesis

CHEN YeWei;SONG HaiBin;GUAN YongXian;GENG MingHui;LIU ShengXuan;State Key Laboratory of Marine Geology,School of Ocean and Earth Science,Tongji University;Key Laboratory of Marine Mineral Resources,Ministry of Land and Resources,Guangzhou Marine Geological Survey;  
Based on multi-beam bathymetry and multi-channel seismic reflection data,as well as remote sensing data,we study the subaqueous sand dunes in the Dongsha region of the northern South China Sea,summarize the distribution features of the badforms,and analyze their hydrodynamic genesis.According to the spatial distribution characteristics,the subaqueous sand dunes are divided into parallel,wavy and reticular features.We focus on the distribution and formation mechanism of the reticular dunes which are distributed on the upper continental slope at depths of352~420 min the northeastern area to the Dongsha Atoll.The study shows that there are three directions of sand dune crest/trough extension:NS,NE-SW and EW.The former two are induced by the internal waves of westward propagation.While the last is likely to be formed by northward diffracted internal waves when they encounter the Dongsha Atoll.The northwardpropagating internal waves induce the southward bottom current.The bottom flow caused from internal waves can flush the seafloor and suspend the sediments,thus can form the subaqueous sand dunes of EW direction.It is worth mentioning that,above the polygonal reticular dunes,the seismic reflection sections reveal that the trough-to-trough wavelength is consistent between the high-frequency oscillating internal waves and subaqueous sand dunes.The relevant diffraction and internal wave interference regions can be recognized in the remote sensing data,and the internal wave interference is likely to cause high-frequency oscillation,thus forming a reticular dune field.
【Fund】: 国家自然科学基金(41576047 41506054);国家自然科学基金重大计划重点项目(91128205)资助
【CateGory Index】: P631.4;P715.7
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