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Showing 1 to 20 of 21 for “"fine-grained sediment"”.
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Numerical Simulation of the Propagation of Fine-Grained Sediment Pulses in Alluvial Rivers
Sediment pulses are defined as large amounts of loose sediment that are suddenly deposited in river corridors due to the action of external factors or processes of natural or anthropogenic origin. Such factors and processes include landslides, debris flows from tributaries, volcanic eruptions, dam …
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A study into the mapping of an induced fracture in a fine grained sediment in biaxial and triaxial stress formations
… resources that are trapped within impermeable sediments. Shale hydrocarbon reservoirs have a permeability of less than 0.01mD, therefore to extract hydrocarbons the shale has to be fractured to release the trapped fluid. The ability to predict when a fracture will occur and what the resulting …
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Fine-grained sedimentation on the Chenier Plain Coast and inner continental shelf, northern Gulf of Mexico
… the evolution of a mud-dominated coastal sedimentary system on multiple time scales. Fine-grained systems exhibit different properties and behavior from sandy coasts, and have received relatively little research attention to date. Evidence is presented for shoreline accretion under …
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Intertidal Habitat Utilization by Endangered Green Sturgeon (Acipenser medirostris), Willapa Bay, Washington
… that green sturgeon are feeding in areas with fine-grained sediment (>2.0 phi). Feeding pit observations declined when surveying areas with thick eelgrass beds and increased in bare areas. No feeding pit activity was observed within aquaculture parcels adjacent to feeding sites. The majority of …
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Fine-grained sedimentation on the Chenier Plain Coast and inner continental shelf, northern Gulf of Mexico
… the evolution of a mud-dominated coastal sedimentary system on multiple time scales. Fine-grained systems exhibit different properties and behavior from sandy coasts, and have received relatively little research attention to date. Evidence is presented for shoreline accretion under …
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Three-Dimensional Reconstruction of Marine Clay Nano- and Microstructure By Transmission Electron Microscopy: Analysis of Fabric and Pore Network
<p>Three-dimensional reconstructions of marine fine-grained sediment open a new dimension for studying nano- and microscale organo-clay fabric important to improving and advancing organic matter (OM) sequestration and fluid flow dynamics modeling. I created 3-D reconstructions of clay fabric and …
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Determination of geotechnical properties of seafloor sediment using a free fall penetrometer
… evaluate the engineering properties of surficial sediment. Two experimental probes, each equipped with accelerometers, pressure sensors and optical backscatter sensors were deployed in different sediment regimes. The data collected was used to derive the sediment type and determine physical …
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The Effective Viscosity of Ash-Laden Flows
… becomes entrained in the flow, along with other fine-grained sediment and increases the effective viscosity of the flow. The increase in effective viscosity decreases the settling velocity of the sediment within the flow, which in turn increases the bulk density of the flow. The increase in bulk …
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The Effective Viscosity of Ash-Laden Flows
… becomes entrained in the flow, along with other fine-grained sediment and increases the effective viscosity of the flow. The increase in effective viscosity decreases the settling velocity of the sediment within the flow, which in turn increases the bulk density of the flow. The increase in bulk …
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An investigation of two periglacial landforms on ignimbrite blockslopes in Kluane National Park and Reserve, Yukon Territory
… two features spatially, morphologically, and sedimentologically, placing them within the periglacial literature and hypothesizing plausible formative processes. The first study documents a feature similar to stone-banked solifluction terraces, termed blockslope terraces (BSTs) within this …
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Depositional system and source rock potential of the Sharon Springs Formation in Colorado
… and preservation of organic carbon was pelagic sedimentation in an anoxic, stratified and stagnant water column. Observations made in core and outcrop suggest that the Sharon Springs and Gammon Ferruginous formations were deposited by offshore sediment gravity flows. Storms likely assisted in …
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Geoarchaeological Assessment of Horseshoe Cave (24RB1094, Rosebud County, Montana
… disintegration of the surrounding sandstone, a sedimentary process augmented by the occasional rock fall and from fine grained clastic materials being blown into the cave during arid times. The annual sedimentation rate ranges between 0.3 and 0.5 mm. A sieve analysis of a 1.35 m column of …
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Geoarchaeological Assessment of Horseshoe Cave (24RB1094, Rosebud County, Montana
… disintegration of the surrounding sandstone, a sedimentary process augmented by the occasional rock fall and from fine grained clastic materials being blown into the cave during arid times. The annual sedimentation rate ranges between 0.3 and 0.5 mm. A sieve analysis of a 1.35 m column of …
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Modeling temporal and spatial variations in dissolved oxygen in Amite River
… in DO in lowland rivers with organic-rich fine-grained sediment. The modeling framework is based on three major contributions/new models, including (1)VART-DO model for improved estimation of reaeration coefficient (K2) in natural streams, (2)VART-DOS model for simulation of temporal …
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Soil erosion and suspended sediment dynamics in intensive agricultural catchments
Excessive delivery of fine sediment from agricultural river catchments to aquatic ecosystems can degrade chemical water quality and ecological habitats. Management of accelerated soil losses and the transmission of sediment-associated agricultural pollutants, such as phosphorus, is required to …
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Natural and anthropogenic influences on recent sediment characteristics in the Knysna Estuary, South Africa and Yangtze River Estuary, China
… are preferential sites for the accumulation of fine-grained sediment, organic matter and metals from various marine and terrestrial sources including those of natural and anthropogenic origin. The coastal zone performs many key ecosystem service functions for sustainable development, thus making …
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Zircon behaviour in low temperature environments
… mudstones, sandstones and greenschist facies metasediments has been investigated using conventional SEM techniques (BSE, CL and SE imaging) and reveals highly variable microstructures and textures. In these rocks, zircon readily responds to low temperature events due to radiation damage in its …
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Developing Recognition Criteria for Current-Wave-Enhanced Sediment Gravity Flows
<p>Sedimentary fabrics preserved in the rock record provide some of the best evidence for interpreting paleo-depositional conditions. Muddy sediments in particular are important paleoenvironmental archives, preserving the most complete stratigraphic record of any rock type in basinal settings. …
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Modelling fine sediment transport over an immobile gravel bed
Fine-grained sediment represents a significant component of the total transport load in most fluvial systems around the world that are not limited to the alluvial rivers with sandy beds. A variety of natural or human actions, such as fire, logging, flow diversion, road construction, and urban or …
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From meander bend to oxbow lake: morphodynamics and sedimentology of chute cutoffs
… channel, excavating a large volume of floodplain sediment as the chute channel deepens and widens. Bar development at the upstream and downstream ends of the cutoff channel leads to abandonment of the bend and formation of an oxbow lake, which, together with oxbow lake sedimentation, contributes …
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