Active slope failure,sediment collapse,and silt flows on the modern subaqueous Huanghe (Yellow River) delta |
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| Authors: | D B Prior Z -S Yang B D Bornhold G H Keller N Z Lu W J Wiseman Jr L D Wright J Zhang |
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| Institution: | (1) Coastal Studies Institute, Louisiana State University, 70803 Baton Rouge, LA;(2) Department of Marine Geology, Shandong College of Oceanography, Qingdao, Shandong, P.R.C.;(3) Geological Survey of Canada, Pacific Geoscience Centre, V8L 4B2 Sidney, B.C., Canada;(4) School of Oceanography, Oregon State University, 97331 Corvallis, OR;(5) Virginia Institute of Marine Science, College of William and Mary, 23062 Gloucester Point, VA |
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| Abstract: | Post-depositional slope instability and bottom mass-movement processes strongly modify the progradational subaqueous slopes of the modern Huanghe (Yellow River) Delta. Wide, shallow gullies dissect the submarine slopes with gradients of 0.3 to 0.4°. Lower delta-front sediments experiencein situ subsidence, forming numerous collapse depressions. These processes are pronounced over much of the delta, incising and redistributing the most recently deposited silt-rich sediment. Principal causative factors include low sediment strengths created by rapid deposition in the delta during annual peak discharges from the river and severe bottom perturbations by surface storm-generated waves. |
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