Global ETD Search
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Showing 1 to 13 of 13 for “"vertical accretion"”.
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Spatial and temporal variability in floodplain sedimentation during individual hydrologic events on a lowland, meandering river: Allerton Park, Monticello, Illinois
… through two main processes: lateral and vertical accretion. In fine grained systems, vertical accretion dominates. Overbank flooding and floodplain inundation are dependent on bank height and local topographic variability and this leads to highly variable deposition both spatially and …
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Landscape analysis of vegetation change in coastal Louisiana following hurricanes Katrina and Rita
… the importance of mineral sediment deposition on accretionary processes. Hurricane effects were most direct and prominent in eastern Louisiana from Katrina and western Louisiana from Rita, compared to central Louisiana exposed to indirect affects from Rita. A coastwide analysis of moderate …
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Spatial structure and dynamics of the plant communities in a pro-grading river delta : Wax Lake Delta, Atchafalaya Bay, Louisiana
… at higher water levels, suggesting substantial vertical accretion across much of the subaerial delta. The plant community responded to this vertical accretion by shifting to higher elevation species across nearly 9 km2 of the delta. Overall, these results indicate that the plant community in the …
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Multifunctional experimental assessment in a newly established Mediterranean restored marsh : marsh elevation, carbon accumulation and pollutant concentration reduction
… of restored marshes providing simultaneously vertical accretion to deal with flooding risk, carbon (C) sequestration and pollutant removal services. A need for more knowledge is required to optimize factors controlling these ecosystem services seeking to work as natural defence against …
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Braided stream deposition and provenance of the Late Cretaceous-Paleocene(?) Canaan Peak Formation, Table Cliff and Kaiparowits Plateaus, southwestern Utah
… (Ss). Siltstone (Fm) deposition resulted from vertical accretion on bar tops during waning flow conditions; Clast imbrication and trough axis orientation measurements indicate east to northeast paleoflow directions; Canaan Peak Formation detritus was derived from erosion of highlands created by …
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Examining Coastal Marsh Sedimentation In Northeastern North Carolina
… enhanced deposition to the marsh, which aids in vertical marsh accretion. While shoreline erosion provided some sediment for vertical accretion, a large amount of the eroded material is transported elsewhere. Accumulation rates suggested that these marshes have been keeping pace with sea-level …
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Detecting Coastal Marsh Change from Aerial Imagery using Spectral and Textural Methods: Pascagoula River Estuary, Mississippi, 1955-2014
… marsh ecosystems are increasingly vulnerable. Vertical accretion rates must exceed or keep pace with rates of sea level rise to prevent transition to open water or inland migration of marsh vegetation. While some marsh systems along the northern Gulf of Mexico coast have remained stable, …
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Sedimentary Characteristics of an Estuarine Marsh System and the Roles of Storm Overwash, Micro-tidal Currents, and Organic Production: Big Branch Marsh, Louisiana
… of these two depositional processes with vertical accretion of organic matter is the mechanism by which micro-tidal marshes are sustained. Results should inform coastal restoration efforts, notably activities to introduce additional sediment into marsh environments to offset relative …
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Keeping Pace with Relative Sea Level Rise: Marsh Platform Monitoring Shows Minimal Sediment Deficit along the Louisiana Coast
… bulk density, organic fraction, and vertical accretion rates from 273 sites, a direct measurement of organic and inorganic sediment accumulation can be made. Results show that a total of 82 MT/year of sediment is delivered to the coast. Using a fluvial sediment discharge of 113 …
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Accumulation of sediment and radionuclides in tidal marshes of the Murderkill River Estuary, Delaware
… rates of sediment accumulation and tidal marsh accretion in the Murderkill River estuary, Delaware, with special emphasis placed on changes in accumulation rates and sediment physical properties associated with historical land-use practices, such as mosquito ditching. Over 90% of United States …
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How do sand-bed meandering rivers co-construct their own bankfull discharge and bankfull channel geometry? Analytical and numerical study
… are established as a result of i) floodplain vertical accretion due to overbank deposition, ii) inner bank migration and outer cut bank migration, iii) net removal of floodplain sediment and reduction in average floodplain height due to lateral channel shift, and iv) in-channel downstream bed …
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A stratigraphic and sedimentologic analysis of the Tongue River and Sentinel Butte Formations (Paleocene), western North Dakota
… deposition (in excess of basinal subsidence), vertical accretion, and eastward overstepping of the Sentinel Butte sequence. </p>