Global ETD Search
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Showing 1 to 17 of 17 for “"Mississippi River delta"”.
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The Mississippi River Delta Basin and Why We are Failing to Save its Wetlands
Every thousand years or so, when the Mississippi River's sediment load lengthened and blocked the River’s route to the Gulf of Mexico, the mother stream changed course completely, finding a shorter route to the sea. Then, it built a new delta, thus spreading the gift of land creation along a wide …
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The fate and transport of light petroleum hydrocarbons in the Lower Mississippi River Delta
… of light petroleum hydrocarbons in the Lower Mississippi River and other river delta systems are not adequately represented in existing oil spill models. In response, three methods were introduced to include the effects of dynamic annual discharges and variation of shoreline type on shoreline …
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Linking nitrogen biogeochemistry to different stages of wetland soil development in the Mississippi River Delta, Louisiana
… eutrophication occur across the Mississippi River delta and include newly emergent landscapes, in the early stages of ecological succession, and older landscape formations, with fully developed ecological communities. Here I tested how the anthropogenic effects of a …
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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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Evaluating Commodity Farm Program Selection and Economic Return Variability on Representative Farms in the Mississippi River Delta Region Using a Risk Return Framework
… this law has on agricultural producers in the Mississippi River delta region of the Mid-south is not yet fully known. Moving forward, the elimination of the direct payment program is likely to have an impact on farm income, as these payments were made annually and were decoupled from actual …
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Long-term Residue and Water Management Effects on Soil Respiration and Soil Aggregate Stability in a Wheat-soybean, Double-crop System in Eastern Arkansas
… in a silt-loam soil (Aquic Fraglossudalf) in the Mississippi River Delta region of eastern Arkansas after more than six years of consistent management. To this end, soil respiration was measured every two weeks during the 2011 and 2012 soybean growing seasons. A wet-sieving procedure was used to …
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Differential Sedimentation In A Mississippi River Crevasse Splay
… basin of a crevasse splay in the modern Mississippi River delta are examined, with emphasis on the development of a distributary mouth bar. Simultaneous hydroacoustic and optical measurements on the mouth bar show that the bar conforms to the progradational stage of an existing conceptual …
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Subsurface controls on mainland marsh shoreline response during barrier island transgressive submergence
… their attendant marshes to sea level rise. The Mississippi River delta plain, specifically the Chandeleur Islands and associated interior wetlands in eastern Louisiana, serves as an excellent natural laboratory for studying these responses. This region is presently undergoing the highest rates …
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A Comparative Analysis of the Subsurface Stratigraphic Framework to the Geomorphic Evolution of the Caillou Bay Headland, South-Central Louisiana
… variable rates of surface subsidence across the Mississippi River delta plain of Louisiana. Variations in patterns and rates of delta plain subsidence may reflect subsurface distribution of compactionprone lithosomes. This research investigates historical changes in the surface geomorphology of …
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Geomorphic History of the Atchafalaya Backwater Area: Upper Deltaic Plain Development
… researchers have produced conceptual models of Mississippi River delta plain development which divide the deltaic plain into upper and lower reaches. The upper deltaic plain has been described as an area composed mainly of lacustrine, lacustrine delta, backswamp, and crevasse channels, with …
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Long and Short-Term Morphologic Evolution and Stratigraphic Architecture of a Transgressive Tidal Inlet, Little Pass Timbalier, Louisiana
… High rates of relative sea-level rise within the Mississippi River delta plain have resulted in rapid landwardmigration of barrier island and tidal inlet systems. Moreover, ongoing conversion of back barrier and interior wetlands to open water increases tidal exchange. Enlarging tidal prisms, …
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Flooding as Remembering: A Trickster’s Guide to Fugitive Ecology, Revolutionary Recall, and Speculative Worldbuilding Beyond the Plantationocene
… and Afro-Indigenous peoples of the Lower Mississippi River Delta have survived recurrent processes of settler colonial un-worlding by re-worlding sovereign lifeways rooted in reciprocal relationships to other colonized peoples and the environment. Un-worlding occurred to Black and …
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Long-Term Effects of Rice Rotation, Tillage, and Fertility on Near-Surface Soil Carbon and Nitrogen Cycling
… Extension Center near Stuttgart, which is in the Mississippi River Delta region of eastern Arkansas, to evaluate the long-term effects of rice-based crop rotations [with corn (Zea mays L.), soybean (Glycine max L.), and winter wheat (Triticum aestivum L.)], tillage [conventional-tillage and …
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Assessment of oxygen sources and sinks in the northern Gulf of Mexico using stable oxygen isotopes
… large flux of freshwater and nutrients from the Mississippi River, which influences both biological and physical processes that control oxygen dynamics. Yet, based on oxygen concentration measurements alone, it is difficult to separate the effects of biological factors from physical factors. To …
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Bulle-Effect and its implications for morphodynamics of river diversions
… one of the fundamental elements of a fluvial (river) system, and diversions are a special type of asymmetrical bifurcation where one of the channels after bifurcation continues along the original channel. Diversions can be found in nature, though many of them are built to divert water and …
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Mat Movement in Coastal Louisiana Marshes: Effect of Salinity and Inundation on Vegetation and Nutrient Levels
… of floating marshes in the rapidly subsiding Mississippi River Deltaic Plain, with concomittant increases in ambient salinities is obvious. Their potentially unique responses to these environmental forcing functions deserve closer attention when mitigation measures are conceptualized and …
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Framework and Evolution of a Transgressed Delta Lobe: The St. Bernard Shoals, Gulf of Mexico
… marine reworking, and submergence of Mississippi River deltaic lobes. However, one of these shoals, the St. Bernard Shoals, is dissimilar to the other shoals in morphology and stratigraphy. Understanding the processes that lead to these differences resulted in the development of a …