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Showing 1 to 20 of 32 for “"Lower Mississippi River"”.
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Numerical Modeling of River Diversions in the Lower Mississippi River
The presence of man-made levees along the Lower Mississippi River (MR) has significantly reduced the River sediment input to the wetlands and much of the River's sediment is now lost to the Gulf of Mexico. The sediment load in the River has also been decreased by dams and river revetments along the …
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Numerical Simulation of Unsteady Hydrodynamics in the Lower Mississippi River
Alterations along the Mississippi River, such as dams and levees, have greatly reduced the amount of freshwater and sediment that reaches the Louisiana coastal area. Several freshwater and sediment diversions have been proposed to combat the associated land loss problem. To aid in this restoration …
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The fate and transport of light petroleum hydrocarbons in the Lower Mississippi River Delta
… transport 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 …
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Effects of Hydrological Connectivity on the Benthos of a Large River (Lower Mississippi River, USA)
… effects of hydrological connectivity between the Mississippi River main channel and adjacent secondary channel and floodplain habitats on macroinvertebrate community structure, water chemistry, and sediment makeup and chemistry are analyzed. In river-floodplain systems, connectivity between the …
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Bacterial Assemblages And Microbial Enzyme Activity In The Major Tributaries Of The Lower Mississippi River
… analyses of bacterial assemblages in large rivers. Rivers form important connections between terrestrial land use and marine biogeochemistry and act as conduits for organisms and allochthonous nutrients. Bacteria dominate carbon cycling and nutrient processing in rivers, and therefore can …
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Assemblage characteristics and sampling considerations for aquatic macroinvertebrates inhabiting a lower Mississippi River stone dike
… assemblages associated with stone dikes on the Lower Mississippi River and to obtain basic information on assemblage composition, structure, and patterns of distribution over a dike. For study purposes, stone-filled baskets were implanted into a dike near Vicksburg, Mississippi, in February …
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Sedimentary Characteristics and Nutrient Sequestration of Embanked Floodplains Along the Lower Mississippi River, Mississippi and Louisiana
<p>The Mississippi River Basin is the largest river basin in North America and the third largest river basin in the world. Most of the corn, soybeans, wheat, cattle, and hogs harvested in the United States come from the Mississippi River Basin and about 58% of the entire drainage basin is …
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Use Patterns and Influencing Factors of Irrigation Best Management Practices in the Lower Mississippi River Basin
… Irrigation Survey from Arkansas, Louisiana, and Mississippi to document the use of irrigation best management practices (IBMPs), analyze use patterns, and use quantitative methods to determine factors that influence producers’ decisions regarding IBMPs. IBMPs included in the survey can be grouped …
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Behavior, Energetics, And Swimming Performance Of The American Paddlefish, Polyodon Spathula, In A Lower Mississippi River Oxbow
… an oxbow located just north of Clarksdale, Mississippi (Moon Lake). Paddlefish overwintered in the deepest portions of Moon Lake with little movement into shallower areas. Paddlefish swimming performance was measured at four swimming speeds (76.04, 91.27, 106.50, and 121.72 cm/s) to …
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Effects of Hydrologic Connection on Physicochemical Conditions and Algal Properties in Backwaters of the Lower Mississippi River
In the last 50-100 years, the Mississippi River has been extensively engineered for flood control and navigation purposes. These modifications have substantially decreased the frequency of flooding and degree of contact of the river with its historical floodplain. However, in many areas within the …
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Exploring Overbank Sediment Deposition Variation in Heavily Modified Floodplains of the Lower Mississippi River: A Sedimentological and Geophysical Analysis
<p>Since the 1930s, the Lower Mississippi River (LMR) has experienced large-scale modifications to the channel profile and surrounding floodplains through dams, dikes, revetments, dredging, and channel cutoffs. Although these changes have improved navigation and reduced flood risk, unanticipated …
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Sedimentary Dynamics and Water Quality in Floodplains of the Lower Mississippi River near Natchez, Mississippi, during the 2018 and 2019 Floods
<p>The Lower Mississippi River (LMR) near Natchez, Mississippi, experienced intervals of major flooding during the 2018 and 2019 water years. While federal agencies sample sediment and water quality in the main LMR channel, little is known about sedimentary dynamics, water quality, and nutrient …
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SEDIMENTARY CHARACTERISTICS AND ASSOCIATED CARBON AND NUTRIENTS OF OVERBANK SEDIMENTS DEPOSITED DURING THE 2018, 2019, AND 2020 FLOODS IN EMBANKED FLOODPLAINS ALONG THE LOWER MISSISSIPPI RIVER NEAR NATCHEZ, MISSISSIPPI
<p>The Lower Mississippi River (LMR) experienced major floods in 2018, 2019, and 2020. Sediment deposition in the embanked floodplains during floods represent important storage and sequestration opportunities for carbon and nutrients from ~40% of the continental USA. This research aims to compare …
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Causes of the decline in the loss of vegetated palustrine wetlands in the U.S. 1955 - 2009
… factors in loss rates in the Midwest, Lower Mississippi River Valley and the Southeast United States. The variables considered are: Swampbuster provisions of the Food and Security Act of 1985, Conservation Reserve Program enrolled acreage and rental rates, Wetland Reserve Program and …
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Mississippian Feasting Strategies In the Lower Mississippi Valley: Archaeobotanical Analysis of Two Features From Winterville Mounds (22WS500)
… Yazoo Basin located just north of Greenville, Mississippi, is representative of Mississippian culture in the lower Mississippi River valley. Botanical macroremains from flotation samples from two large pit features from the Winterville site have been chosen for this study: Feature 113, a large …
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Biophysical economic analysis of nutrient and sediment management practices in the Mississippi Alluvial Valley
… for the Cabin-Teele sub-watershed, within the lower Mississippi River Basin. The dissertation had two objectives. The first objective was to examine the economic and environmental impact of tillage and nutrient management practices in reducing agricultural pollutants to meet TMDL requirements. …
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Revisiting Magee: A Mississippian Mound Center Site
… located in the Southern Yazoo Basin of the Lower Mississippi River Valley (LMV). Originally recorded by Phillip Phillips, James A. Ford, and James B. Griffin in 1941, the site has not been professionally investigated since then (Phillips, Ford, and Griffin: 1951). Based on their surface …
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Flow-Transport Modeling and Quantification
… sediment transport over bed forms in alluvial rivers (e.g. mean flow field, turbulence, shear partitioning, bed load transport and bed form geometry). Much of this work was either laboratory studies or small scale field investigations. Recently, advance in technology have improved the way data …
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Characterizing Variable Flow Pathways And Geochemical History Of Seepage Under The Mississippi River Levee: 2011, 2015, And 2016 Floods
… where transported sediments discharge. Along the lower Mississippi River, pathways beneath the levee vary with surface geology, following deeper paths where the levee overlies channel fill deposits, and shallower paths where it overlies sand bar deposits. A preliminary investigation north of …
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