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Showing 1 to 20 of 37 for “"subaqueous"”.
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Pedogenesis, Inventory, and Utilization of Subaqueous Soils in Chincoteague Bay, Maryland
… objectives of this study were to identify the subaqueous landforms, evaluate the suitability of existing subaqueous soil-landscape models, develop a soils map, and demonstrate the usefulness of subaqueous soils information. Bathymetric data collected by the Maryland Geological Survey in 2003 …
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Characterization of Lower Permian Carbonate Subaqueous Gravity Flows in Crockett County, Texas
<p>Transitional sediments on carbonate ramp slopes act as a link to relatively well-studied platform and basin depositional environments. In the southern Midland Basin, the key to understanding the relationship between these environments lies in the allochthonous gravity flow sediments found on the …
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Characterization of Arsenic Hosting Phases in Subaqueous Tailings at Terra Mine, Northwest Territories, Canada
… and aqueous phases of As present in Ho-Hum lake subaqueous tailings and porewaters and identify the most significant geochemical processes driving the behaviour of As hosting phases. Surface water, pore water and lake bottom sediments were collected and analyzed. Water chemistry results were …
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Numerical study on internal flow structures of subaqueous density underflows and stratified open-channel flows
The internal structure of subaqueous density underflows and stratified open channel flows are examined in this study. Three different flow configurations are used to investigate the effects of density stratification on the internal structure and the responses of the structure as flow conditions …
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Subaqueous, hurricane-initiated shelf failure morphodynamics along the Mississippi River Delta Front, north-central Gulf of Mexico
<p>Seafloor instability along the Mississippi River Delta Front (MRDF) gained renewed attention with the landfall of Hurricanes Ivan (2004) and Katrina (2005). Traditional root causes for MRDF shelf failure were exacerbated by sea-state conditions associated with these severe tropical cyclones and …
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Framework and Evolution of a Transgressed Delta Lobe: The St. Bernard Shoals, Gulf of Mexico
… in the development of a wholly new model for subaqueous shoal evolution. The results of this study suggest that the St. Bernard Shoals are transgressive remnants of a near shelf-edge delta lobe that was transgressed and truncated by marine processes after fluvial abandonment. Subsequent to …
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An Integrated Well Log and 3D Seismic Interpretation of Missourian Clinoforms, Osage County, Oklahoma
… within a depositional context. Shelf-prism and subaqueous, delta-scale clinoforms of Missourian age observed in 3D seismic were interpreted with greater sequence stratigraphic detail when coupled with wireline well logs. The Late Pennsylvanian Midcontinent Sea was thought to be approximately 150 …
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Hydrodynamic Controls on Sedimentology and Geomorphology of Marine-Carbonate Ramps: Insights from a Holocene Analogue, Northern Yucatán Shelf, Mexico
… shore-parallel sand bodies (beach ridges and subaqueous dune fields) of the high-energy upper shoreface and foreshore are composed of fine to coarse skeletal sand, lack mud, and includes highly abraded, broken and bored grains. The large shallow lagoon is also mixed energy, wave-dominated near …
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Levee Breach by Overtopping: The Effects of Soil Properties
… been performed. A new methodology to measure the subaqueous breach has been developed and validated. Measurements on breach discharge, breach width evolution and headcut migration are presented and shown to be linked to soil properties. A set of nondimensional equations to describing the breach …
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Evolution of a non-cohesive granular bed subject to a succession of erosive turbidity currents
… as bed sediment that was laid down in a subaqueous straight channel. The elevation of the plastic bed was measured before and after it was subjected to two erosive salt water turbidity currents using a high resolution displacement laser mapping system. These changes in elevation of the …
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An unconformity in the Carolina slate belt of central North Carolina: new evidence for the areal extent of the ca. 600 Ma Virgilina deformation
… rocks. Deposition of these units was in a subaqueous environment although some units are indicative of transient subaerial conditions. The Aaron Formation is a volcanic epiclastic sequence composed of conglomerate, pebbly and feldspathic arenite with intercalated siltstone, argillite and …
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Comparison of Flow Dynamics and Bifurcation Angles in Tributary and Distributary Channel Networks
… case the shallow surface water surrounding the subaqueous portion of distributary channels in a deltaic setting. We measured 25 unique distributary bifurcations in an experimental delta and 197 bifurcations in 10 natural deltas, yielding a mean angle of 70.4° ± 2.6° (95% confidence interval) for …
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Depositional History and Petroleum Potential of the Middle Devonian Fort Vermilion Formation, Alberta
… for this unit whereby sedimentation occurred subaqueous in a protected, variably deep, restricted basin. Based upon core examination, petrography, and various geochemical analyses, four facies assemblages representing four environments were identified: restricted and hypersaline, early …
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Sand dune interactions
… of idealised laboratory experiments within a subaqueous annular set-up. The central part of the dissertation is dedicated to pairwise interactions between two discrete sand dunes. First of all, we study the physical underpinnings of a wake-induced dune-dune feedback. By quantifying the …
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Modern Fair-Weather and Storm Sediment Transport Around Ship Island, Mississippi: Implications for Coastal Habitats and Restoration Efforts
… are used to investigate both subaerial and subaqueous volume changes during the most recent intense storm impact, Katrina, and the fair-weather period following. During the Katrina event, sediment comparable to 1.5 times the 2004 subaerial island volume was lost from the topo/bathy system. …
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Carbonate ramp to deeper shale-shelf transitions of an Upper Cambrian (Dresbachian) shelf embayment, Nolichucky Formation, southwest Virginia
… lithologies (storm-lag, debris-flow, or other subaqueous gravity flow deposits); and shaly packstone/wackestone with trace fossils, glauconite horizons, hardgrounds, and erosion/truncation surfaces. A 15 m thick tongue of cyclic carbonates within the shale package contains subtidal calcareous …
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Aridification of the Indian subcontinent during the Holocene : implications for landscape evolution, sedimentation, carbon cycle, and human civilizations
… second site, a seismic survey of the Indus River subaqueous delta describes the morphology and Holocene sedimentation of the Pakistani shelf and identified suitable coring locations for paleoclimate reconstructions. The δ13Cwax record shows a stable arid climate over the dry regions of the Indus …
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Seagrass Carbon Standing Stock in the Northern Gulf of Mexico: The Role of Seagrass Beds in Mississippi as Potential Blue Carbon Sinks
… to long-term blue carbon standing stocks. Subaqueous sediment cores were collected to 1-m depth in seagrass meadows and bare sediment habitats surrounding Cat Island, Mississippi to characterize the carbon storage capacity of these habitats. Sediment cores were analyzed for grain size, bulk …
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Multibeam echosounding as a tool for mapping geologic features, bathymetry and modern vents, Yellowstone National Park, Wyoming
… mapping as well as geohazard evaluation in subaqueous hydrothermal environments.
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Aridification of the Indian subcontinent during the Holocene : implications for landscape evolution, sedimentation, carbon cycle, and human civilizations
… second site, a seismic survey of the Indus River subaqueous delta describes the morphology and Holocene sedimentation of the Pakistani shelf and identified suitable coring locations for paleoclimate reconstructions. The ([delta]¹³Cwax record shows a stable arid climate over the dry regions of the …
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