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Showing 1 to 16 of 16 for “"turbidity current"”.
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Quantifying turbidity current interactions with topography
… our understanding of how transport properties of turbidity currents are mediated by interactions with seafloor topography, specifically channelized surfaces. Turbidity currents are responsible for crafting the morphology of continental margins. Unfortunately, very few direct observations exists …
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Turbidity current processes and deposits on the northwest African Margin
… background sedimentation, alongslope bottom currents, and downslope gravity flows. A large section of the margin can be classified as a fine-grained clastic slope apron, although the presence of numerous volcanic islands and seamounts leads to a more complex distribution of sedimentary …
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Bed aggradation experiments in a small recirculating flume employing 40 micron silt with special reference to turbidity current depositional structures,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1972.
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Layer-averaged modeling of turbidity currents with a finite element method
… system of partial differential equations for a turbidity current flowing in deep ambient water. Since the standard Galerkin method yields spurious oscillations when applied to convection-dominated flows, the dissipative-Galerkin technique which has a selective damping property, is used. In order …
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Megaturbidites and the late Quaternary regional sedimentology of the eastern and central Mediterranean Sea
… and influences on emplacement of the many turbidity current deposits (turbidites) noted in the stratigraphy. Radiocarbon dating and geochemical fingerprinting of turbidite muds has allowed construction of an accurate stratigraphy and correlation for the Herodotus Basin, with the recognition …
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Sediment plumes and financial modeling in the context of deep-sea polymetallic nodule mining
… the sediment discharge initially behaves as a turbidity current, shifting the currently established modeling paradigm for such plumes towards a multi-scale approach. The turbidity current sets the initial conditions of the subsequent ambient plume that is then transported by ocean currents, and …
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Submarine Geomorphology of the Continental Shelves of Southeast and Southwest Greenland from Olex Data
… single-beam echo-sounder lines, were utilised. Turbidity current-channel systems and gullies on the continental slopes, and moraines on the continental shelf edge of Southern Greenland indicate that the Greenland Ice Sheet extended to the continental shelf edge during the LGM. Drumlins and …
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Sedimentation on a mixed siliciclastic/carbonate continental margin over decadal to millennial timescales: Gulf of Papua
… 7-14×106 tonnes. The existence of possible turbidity-current transport and deposition have been documented in deeper parts of the Gulf of Papua. High excess 210Pb fluxes estimated from seabed inventories at the shelf edge and upper slope are consistent with the combined effects of sediment …
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Investigation into the post-mortem transport of benthic foraminifera
… empty tests in static water and unidirectional currents. Hyaline foraminifera have been selected for these experiments, as they are the most abundant tests found in shelf and upper-slope environments and consequently are most likely taxa to be entrained into gravity flows.Static water …
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Quaternary geology of Sargent County, North Dakota
… sediment); and silt, sand, silty sand, and clay (turbidity-current sediment). </p><p> The Walsh Formation comprises the remaining 5 percent of the county and includes four facies: clay (lacustrine sediment), sandy silt (slope wash sediment), clayey silt (fluvial overbank sediment), and silty sand …
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Effect of self-stratification on channel flows and boundary layers: a study using direct numerical simulations
… as hypoconcentrated flows, mudflows, lahars and turbidity currents, to name a few. Effect of suspended sediment on the flow has wide ranging impact on geomorpholoy, ecological health, infrastructure health and contaminant transport. Thus, accurate prediction of suspended sediment load and …
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The Skiddaw Group of Cumbria : early Ordovician Turbidite sedimentation and provenance on an evolving microcontinental margin.
… facies and compositions to the Skiddaw Group. Turbidity current flow on a submarine fan of Arenig age was strongly influenced by sea floor topography. A palaeocurrent interpretation is presented which uses the theory of oblique reflection of turbidity currents (Kneller, Edwards, McCaffrey and …
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Numerical study on internal flow structures of subaqueous density underflows and stratified open-channel flows
… to amplify these effects. For natural density currents, the effect of slope becomes important. As the slope decreases, the flow becomes more subcritical and the flow entrainment rate decreases. Such model predictions are consistent with various experimental studies and field observations. The …
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Mid- to Late Holocene flood reconstruction from two varved sediment profiles of pre-alpine Lake Ammersee (Southern Germany)
… body the transport capacity of the inflowing turbidity current successively diminishes leading to the deposition of detrital layers on the lake floor. Intercalated into annual laminations these detrital layers can be dated down to seasonal resolution. Microfacies analyses and X-ray …
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Late Weichselian and Holocene Glacimarine Sedimentation and Environments in Kejser Franz Josephs Fjord and On The Adjacent Continental Margin, East Greenland
… 13,020-15,250 yr BP is dominated by repetitive turbidity current activity derived from upper continental slope mass wasting, which reverts to more quiescent rain out and suspension settling after 13,020 yr BP. The exact nature of ice retreat could not be reconstructed in this study. The Younger …
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Experimental study of reservoir turbidity currents venting
… on a laboratory flume to analyze the behavior of turbidity currents while using the pass-through sediment management technique of venting. The main focus was to explore and develop a better understanding of the streamwise flow velocity and suspended sediment concentration vertical profiles, and …