LONG Hai-yan, ZHUANG Zhen-ye, LIU Sheng-fa, LÜ Hai-qing, YE Yin-can, DU Wen-bo. ACTIVITY MAGNITUDE OF THE SMALL-MEDIUM SUBAQUEOUS DUNES IN THE YANGTZE SHOAL[J]. Marine Geology & Quaternary Geology, 2007, 27(6): 17-24.
Citation: LONG Hai-yan, ZHUANG Zhen-ye, LIU Sheng-fa, LÜ Hai-qing, YE Yin-can, DU Wen-bo. ACTIVITY MAGNITUDE OF THE SMALL-MEDIUM SUBAQUEOUS DUNES IN THE YANGTZE SHOAL[J]. Marine Geology & Quaternary Geology, 2007, 27(6): 17-24.
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ACTIVITY MAGNITUDE OF THE SMALL-MEDIUM SUBAQUEOUS DUNES IN THE YANGTZE SHOAL

  • 1 Ocean University of China, Qingdao 266100, China;

  • 2 Institute of Oceanology, Chinses Academy of Sciences, Qingdao 266071, China;

  • 3 Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

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  • Received Date: May 29, 2007
  • Revised Date: August 14, 2007
    Graphical Abstract
    • Abstract
  • The Yangtze shoal, located in the east of the Yangtze River Estuary and about 40 m deep below sea level,has widely spread small-medium subaqueous dunes,whose wave height is 0.6 m and which are generally in activity. Statistical result of 32 subaqueous dune areas shows that the movement direction is within 90°~180°.150°~180° direction accounts for 30% and 120°~150° for 69%. The movement velocity of the small-medium subaqueous dunes, calculated using the formulas from Rubin and Hardisty, is usually 19.70 m/a and controlled by tidal currents, and is 12.7 m/a in storm season.And the total migration rate is 32.4 m/a. Compared with observation data from other small-medium subaqueous dunes in the world, the activity of small-medium subaqueous dunes in the Yangtze shoal belongs to a slow-medium magnitude.
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    • References (20)
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