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Hyperpycnal plumes and plume fronts over the Huanghe (Yellow River) delta front |
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| Authors: | L D Wright Z -S Yang B D Bornhold G H Keller D B Prior W J Wiseman Jr |
| Institution: | (1) Virginia Institute of Marine Science, School of Marine Science, College of William and Mary, 23062 Gloucester Point, VA;(2) Department of Marine Geology, Shandong College of Oceanography, Qingdao, Shandong, Peoples Republic of China;(3) Geological Survey of Canada, Pacific Geoscience Centre, V8L 4B2 Sidney, British Columbia, Canada;(4) School of Oceanography, Oregon State University, 97331 Corvallis, OR;(5) Coastal Studies Institute, Louisiana State University, 70803 Baton Rouge, LA |
| Abstract: | The Huanghe (Yellow River) discharges extremely high suspended sediment concentrations (25 to 220 g/l) which favor sustained hyperpycnal plumes (underflows). Observations of weakly hyperpycnal unchannelized plumes and indirect evidence of strongly hyperpycnal channelized underflows over the delta front indicate the importance of these modes of sediment dispersal. The weakly hyperpycnal plumes occupy the entire water column over the shallow (<5 m) delta top. From a pronounced front near the break in slope at about 5 m depth, they descend over the delta-front slope as wide-spread underflows. Evidence of strongly hyperpycnal underflows was shown from subaqueous valleys partly filled with low-density mud. |
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