Bedforms in Salt Deposits of the Dead Sea Brines January 1987 Journal of Sedimentary Research DOI: Authors: Iaakov Karcz Abstract Study of salt deposits emphasizes the mineralogical and...Web
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The Thar Desert, or the Great Indian Sand Desert (~285,000 km 2), is situated in the arid western part of Rajasthan state in India and includes the adjoining sandy terrain of Pakistan till the Indus River.It forms a distinctive, but integral part of the arid lands of western India that runs through the states of Punjab, Haryana, Rajasthan and Gujarat …Web
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As a result, the available ones are from modeling studies since sand waves, unlike the smaller bedforms, are too large to directly study in lab flumes (Stride et al. 1982). While these have ...Web
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The bedforms in the PR share similarities with our experimental deposits (c.f. Figs. 6a and 2a–c, Figs. 6c and 2d); and measured stoss angles for both natural and experimental bedforms span the ...Web
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Bedforms are also one of the most useful tools available for interpreting ancient sedimentary environments from outcrops. When unidirectional flow operates on relatively fine-grained sand (less than 0.7 mm), the following bedforms appear in order as flow "strength" is increased: current ripples, dunes, upper-regime plane bed (absence of ...Web
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Types of Deposits Typical of Arid Environments - 1) Wind blown sand (well sorted, texturally mature medium or finer sand); 2) Flash flood deposits (poorly sorted breccia, including debris flows); and 3) Playa lake deposits (silt, mud and evaporites). There are also very cold desert environments, such as the McMurdo Dry Valleys, Antarctica ...Web
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Close mobile search navigation. Article navigation. Volume 57, Number 4Web
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Figure 3: The lateral relationship of depositional environments from the ocean (top left) to inland salt ponds and swamps (bottom right) Grain Size. Fine sediment is brought in during high tide and deposited as the tide turns. Tidal flats also have high deposition rates . Common grain size of sediment in tidal flats is silt and clay . Tidal ...Web
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Clay also deposits below the maximum scour depth (~0.075 m), as clay is actively pumped underneath bedforms by hyporheic exchange. b In the locked end state (NU-8), extensive clay accumulation ...Web
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lee side and deposition on the stoss, creating a fining-upward turbidite deposit. c) Crescentic bedforms on the modern seafloor (e.g. Squamish Delta, H ughes-Clarke e t a l ., 2016 ) and their migration upstream. H age e t a l ., 2018 – Crescentic bedforms 2m high, passing flows at 2ms - 1 removed 2m of sediment.Web
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The study aims to: (i) summarize the controlling factors for bedform morphodynamics and the characteristic sedimentary facies in the different sub-environments of glacigenic …Web
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Regular patterns in biofilms (Weerman et al., 2010) and salt marsh vegetation ... 7 cm in diameter, were taken on the Ketenisse mudflat (September 2016) to test the hypothesis that biofilm-covered bedforms consist of laminated deposits, while bare tidal flat does not. Two cores (referred to as 'SE'; 51.284800°N, 4.312494°E) were taken ...Web
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The language of bedforms, The hydrodynamic significance of bedforms, and; An atlas of common sedimentary structures; Transport of sediment; bedload and suspension load ... Mass Transport Deposits, or MTDs, is the term given to sedimentary slumps and slides, mostly generated on relatively high-angle slopes between the shelf or platform margin ...Web
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We have used high-resolution geophysical data to investigate depositional and erosional bedforms in two geomorphologic provinces of the deepwater central Gulf of Mexico Basin: (1) the Mad Dog and Atlantis areas in the Sigsbee Escarpment region and (2) the Holstein minibasin within the salt canopy in the slope.Web
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Bedforms range from relatively small cyclic steps and antidunes within active submarine canyons and channels (~10^1 m wavelength; ~10^0 m height) to large cyclic steps in less confined levee ...Web
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Deposits from hyperconcentrated flows may also include evidence for tractional bedforms. Traction carpets, resulting from a combination of fluid turbulence, hindered settling, and dispersive pressure produced by grain collision, may develop in the basal portion of high-density flows, and are a relatively common feature of grain flows.Web
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Cross-bedding. Cross-bedding (or cross-stratification) is a primary sedimentary feature characterized by layers that intersect at an angle with each other through planar erosional surfaces that truncate inclined beds and laminae. This structure is the result of the migration of bedforms, such as dunes, ripples, and megaripples, produced by wind ...Web
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These bedforms are interpreted as supercritical dunes and/or downstream migrating antidunes. G) Oblique view of the final deposit formed by a stratified jet with medium-grained sediment (run C). Low asymmetric bedforms have formed on the slope of the mouth bar and are interpreted as supercritical dunes and/or downstream migrating …Web
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bedforms, with a mean wavelength of approximately 500 m and heights of 1^3 m.These bedforms indicate a north- going net sediment transport, caused by the Jutland Coastal Current.Large dunes (L=10 ...Web
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On the other hand, the different associated bedforms are also graduated vertically and horizontally. Figure 20.9 shows the thresholds for the development of different bedforms. In the subtidal areas and low intertidal flats, where higher current velocities are reached and the sediment is thicker, dunes and ripples develop.Web
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Bedforms in Salt Deposits of the Dead Sea Brines @article{Rusten1987BedformsIS, title={Bedforms in Salt Deposits of the Dead Sea Brines}, author={Tone Rust{o}en}, …Web
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These flows frequently occur in the form of avalanches from the bed's banks or a dune's lee side, but they are also observed when bedforms suddenly release fixed volumes of sediment (Dhont & Ancey, Citation 2018). At high sediment transport rates, many particles move collectively; they form a shallow layer of rolling and saltating particles ...Web
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Bedforms also vary with grain size (see Figure 4.20, Nichols, 2009). Very fine sand and silt are very easy to transport and erode. ... Usually, the largest grains are part of this first deposit because they weigh more, but small grains are also present. As the amount of sediment decreases, the flow becomes more like typical water flows ...Web
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ABSTRACT Study of salt deposits emphasizes the mineralogical and geochemical aspects of origin with but little attention to processes and features of physical sedimentation. Deposition from saturated brines along one of the main conveyance canals of the Dead Sea Works near Sedom (southern Israel) indicates, however, that in open-channel flow the …Web
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Bedforms. When sediments get deposited from turbulent flows, the sediment interacts with the geometry of the flow. Depending on the flow speed, …Web
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A white salt deposit covers the stream bed, locally displaying well- developed bedforms. The present note deals briefly with the conditions and outcome of this enroute deposition. …Web
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After adjustment for particle and fluid properties, the observed bedforms fall into the same hydraulic factor fields as determined for bedforms in alluvial channels. Salt deposits, therefore ...Web
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When compared to tide-dominated shelves, shelves swept by geostrophic flows are relatively understudied, yet geostrophic currents have the potential to construct substantial current-generated shelf bedforms. This paper examines the evolution of a series of bedforms encountered along the narrow Agulhas Current-swept northern KwaZulu …Web
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