WorldCat Identities

Mississippi State University Department of Geosciences

Overview
Works: 28 works in 28 publications in 1 language and 27 library holdings
Genres: Academic theses  Geographic information systems 
Publication Timeline
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Most widely held works by Mississippi State University
Salt marsh sediment biogeochemical response to the BP Deepwater Horizon blowout (Skiff Island, LA, and Cat Island, Marsh Point and Saltpan Island, MS) by Calista Lee Guthrie( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

The impact of the Deepwater Horizon blowout on coastal wetlands can be understood through investigating carbon loading and microbial activity in salt marsh sediments. Carbon influx causes pore water sulfide to increase in wetland sediment, making it toxic and inhospitable to marsh vegetation. High sulfide levels due to increased microbial activity can lead to plant browning and mortality. Preliminary analyses at Marsh Point, Mississippi indicated that sulfate reducing bacteria are more active in contaminated marsh, producing sulfide concentrations 100x higher than in noncontaminated marsh. Sediment electrode profiles, hydrocarbon contamination, and microbial community profiles were measured at three additional locations to capture the spatial sedimentary geochemical processes impacting salt marsh dieback. Findings indicate that response to contamination is variable due to physical and biogeochemical processes specific to each marsh. Temporal evaluation indicates that there is a lag in maximum response to contamination due to seasonal effects on microbial activity
Investigation of vegetation discontinuities and the enhancement of convection related to the April 27 2011 multiple EF4 and EF5 tornado scars by Barrett Frank Gutter( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

During the April 25 – 28, 2011 severe weather outbreak, 350 tornadoes were confirmed across 21 states, making the event the largest 3-day outbreak in U.S. History. Of the 350 tornadoes, 13 were of EF4 or EF5 strength. Due to complex terrain and vegetation in northeastern Alabama, northwestern Georgia, and eastern Tennessee, only four tornadoes were analyzed in this study. +Abrupt changes in vegetation and the related sensible and latent heat fluxes have been shown to enhance convective activity along and near the resulting land surface discontinuities. This study analyzed heightened convective activity (analyzed by looking at cloud-to-ground lightning data) along each tornado track on days of weak synoptic forcing. Post- tornado months showed no signs of enhanced convective activity along any of the tornado tracks analyzed in this study, which could be attributed to several factors including study period, duration of intensity, tornado track length and width, and land cover
Speleothem strontium concentrations in eogenetic carbonates by Nicole Marie Ridlen( )

1 edition published in 2014 in English and held by 1 WorldCat member library worldwide

Three questions were asked during this research. 1) Does the Sr content of Caribbean speleothems have a direct relationship with the age of the host rock at the time of speleothem precipitation?; 2) do older speleothems contain less Sr than younger speleothems in the same climatic setting?; and 3) will speleothems record the change in Sr concentration of eogenetic carbonates as a faster depletion in climates of higher precipitation as opposed to drier climates? The speleothems and cave rocks in this study were analyzed with various methods in an attempt to understand the rock processes that affect speleothem Sr concentrations. Evidence to support the hypothesis that younger host rock contributes higher concentrations of Sr to speleothems was found in the stalagmites of Curacao while Bahamian stalagmites indicated climatic variations. The results have implications for using stalagmites from relatively young, eogenetic limestone as a proxy for Sr-related paleoclimate data
Geographic analysis of tornadogenesis from landfalling and nearby tropical cyclones in the state of Florida by Charles Eugene Roop( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

Tropical cyclone (TC)-spawned tornadoes in Florida were analyzed to determine patterns of occurrence based on storm and geographic features. Tornadoes were determined to be associated with a landfalling or nearby TC if a tornado occurred within 800 km of the TC's center of circulation. TC-tornadoes were analyzed for patterns based on distance and angle from TC's center, topographic influences, population biases, and influence based on time of landfall. Most TC-Tornadoes tend to occur more often before landfall than after. It was discovered that tornadoes have occurred in different areas with respect to the bearing from the center depending on the landfall location and time of landfall. It was also discovered that land use type, and elevation had little to do with TC-Tornado occurrence. The results do suggest some population bias. The findings will be a guide for operational meteorologists to aid in forecasting likely tornadogenesis from TCs
Predicting flank margin cave collapse in the Bahamas by Lawrence Orry Patrick( )

1 edition published in 2014 in English and held by 1 WorldCat member library worldwide

Sinkhole collapse is a common karst land-use risk around the world. In the Bahamas cover-collapse sinkholes do not exist because soil cover is thin; almost all collapse is due to cave ceiling failure. The most common cave types in the Bahamas are flank margin caves and banana holes. Flank margin caves have three entrance types: dissolution pit, side breach, or ceiling collapse. Both side breach and ceiling collapse are the result of mass erosional forces; pits by focused dissolution. It was previously proposed that slope was a controlling factor in Bahamian cave collapse. This study demonstrated that 7.5 minute topographic maps cannot resolve slopes accurately enough to predict potential collapse locations. Field surveys with 1 m contours allowed for a more concise slope range in which each entrance type preferentially occurred; collapse breaches and pits were common on gentle slopes and side breaches on steep slopes
Investigation of parent source material in Smith County, Mississippi by Kayla Jean Calhoun( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

Calcium bentonite deposits of the Glendon and Bucatunna formations of the Oligocene Vicksburg Group located in Smith County, Mississippi were examined to determine the depositional environment, diagenetic history and origin of the bentonite. Traditionally, calcium bentonite was considered to be the product of the weathering of volcanic ash deposits. The hypothesis tested is that the bentonite deposits are not a result of weathered volcanic ash, but are a result of weathered marl. Core samples were drilled from the Chisholm bentonite mine in Smith County and were studied using X-ray diffraction, scanning electron microscopy, and petrographic microscopy. Abundant bacteria along with nanometer-scale organic textures were found throughout and are consistently associated with bentonite, illite, and smectite. No evidence of volcanic ash was found. It appears that the calcium bentonite clays in the Glendon and Bucatunna formations of Smith County, Mississippi formed from weathering, including bacterial activity, of glauconite-bearing marl
Assessment of reservoir quality and potential impact of sequestered carbon dioxide in diverse lithological reservoir units, south central, Mississippi, USA by Assonman D Degny( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

This study was designed to understand the possible impact of carbon dioxide on different reservoir rocks in south-central Mississippi. Eight samples, including six from the Heidelberg field (Mississippi), were exposed to carbon dioxide under simulated subsurface conditions of elevated temperature and pressure and then analyzed using thin section petrography, scanning electron microscopy, X-ray diffraction, and focused ion beam-SEM. Three of the eight samples showed dissolution in calcite and corrosion in smectite. SEM and EDS analysis of treated sample 5 (Se-5/shaly-sandtsone) and sample 8 (S-8/dolomitic-limestone) revealed newly precipitated lath- and fibrous-like crystals composed of sulfur (S), oxygen (O), and calcium (Ca), thus interpreted as gypsum. Three-dimensional analysis using FIB of dolomitic limestone samples (Smackover Formation) revealed that gypsum crystals fill fracture porosity. This study significantly contributes to the understanding of carbon dioxide impact on reservoir rock and promotes better management of natural gas resources
An investigation into the impacts of land-use/land-cover on cloud-to-ground lightning activity by Nathan Oneal Owen( )

1 edition published in 2014 in English and held by 1 WorldCat member library worldwide

Cloud-to-Ground (CG) lightning activity was analyzed across the lower Mississippi River valley. The goal was to determine whether certain land use/ land cover (LULC) types supported convective thunderstorms' generation of CG lightning more than other LULC types. Results indicate that forested regions receive more CG lightning than any other LULC type represented in the study area. However, results also indicate that CG lightning activity can be enhanced locally by very large and/or sprawling areas of urban LULC. When cities from previous research, including Atlanta, GA, and Birmingham, AL, are combined in the rankings with cities in this study, the urban size difference between Little Rock, Arkansas, and Birmingham, Alabama, appears to highlight the area of urban LULC needed to enhance convection. Future research should focus on more cities within this gap of urban LULC area in order to identify the minimum areal expanse needed to alter convective ability over cities
Evaluation and quantification of modern karst features as proxies for paleokarst reservoirs by Ryan William Travis( )

1 edition published in 2014 in English and held by 1 WorldCat member library worldwide

As karst features are buried into the deep subsurface and isolated from the mechanisms that formed them, they turn into paleokarst. Some karst features, such as hypogene and island karst, have a higher probability of being preserved into the deep subsurface, as opposed to epigene karst. As these features transition from modern karst to paleokarst, they are susceptible to collapse. When an individual passage or room collapses, it results in an increase in the void's areal and volumetric footprint. In addition, individual passages and rooms have the potential to collapse and coalesce into each other, further increasing the cave footprint. The end result is often a large zone of brecciated collapse. While the porosity has decreased, the collapse process integrates the permeability over a much larger area, which is the reason these collapsed paleokarst features form an important class of hydrocarbon reservoirs, paleokarst reservoirs
Investigation of the variability of extreme tornado climatology by Tory Farney( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

Previous tornado climatology research has relied primarily upon means of tornadoes or tornado days. Understanding the variability of tornado days however, will result in a more comprehensive understanding of the climatological distribution of tornadoes. In a changing environment, the extremities of a distribution should change faster than the mean of that distribution. Two methods of analyzing tornado days for predefined areas across the continental United States using the Storm Prediction Center's publication Storm Data from 1950 to 2011 are conducted in this study. Statistical analysis of averages, return periods, and percentiles reveals the variability in the record while consecutive tornado days present an alternative way to assess the seasonal repeatability and to assess risk for historic, multi-day tornado outbreaks. The results of this research will help to better define the traditional “tornado alley” as well as highlight other high- risk locations, especially those with higher interannual variability
Hydrogeological assessment for a suitable location of a reservoir lake in George County, Mississippi / by Corey Tanner Ladner by Corey T Ladner( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

The construction of a reservoir lake was proposed in 2010 for George County, Mississippi, USA. The proposed reservoir would be designed to serve primarily for industrial water storage. As the preliminary portion of the reservoir project, a baseline watershed assessment was performed for the purpose of identifying a reservoir site with potential to fill a lake volume capable of providing a sufficient water supply to prevent the Pascagoula River near Graham Ferry, Mississippi from dropping below a measured 7Q10 base flow when 100 million gallons of water per day are withdrawn from the river for industrial use. The initial focus of the assessment was on three watersheds Big Creek, Big and Little Cedar Creek, and Escatawpa River. Evaluations of surface water quantity and quality measurements along with reservoir daily water storage models suggested two reservoirs were suitable for continuation of the reservoir project
Using teleconnection indices to predict tornado outbreak frequency in the US by Kent Harris Sparrow( )

1 edition published in 2014 in English and held by 1 WorldCat member library worldwide

The goal of this study is to improve seasonal tornado outbreak forecasting by creating a statistical model that forecasts tornado outbreak frequency in the US using teleconnection indices as predictors. For this study, a tornado outbreak is defined as more than 6 tornado reports associated with a single synoptic system and an event N15 rating index of 0.5 or higher. The tornado outbreak season is confined to all months after February for a given calendar year. Monthly teleconnection indices are derived from a rotated principal component analysis (RPCA) of the geopotential height fields. Various regression techniques were trained with a sample of monthly teleconnection indices, tested on new data, and optimized to achieve the highest predictive skill. The outcome of this study could potentially allow forecasters the ability to predict tornado outbreak potential on a climatological scale with months of lead-time, allowing for better preparation strategies for tornado outbreak seasons
A multi-decadal remote sensing study on glacial change in the North Patagonia Ice field Chile by Lucy Korlekwor Tetteh( )

1 edition published in 2014 in English and held by 1 WorldCat member library worldwide

Glaciers in the North Patagonian Ice Fields are temperate glaciers and can be studied to understand the dynamics of climate change. However, the ice field has been neglected in mass balance studies. In this study, multi decadal study of glacial mass balance, glacier retreat and glacial lake expansion in the North Patagonia were studied. Landsat (TM, ETM+ and 8) and ASTER images were used. San Quintin glacier experienced the highest retreat. Demarcation of glacier lakes boundaries indicated an increase in glacial lake area from 13.49 km2 to 65.06 km2 between 1979 and 2013, with an addition of 4 new glacial lakes. Nef glacier recorded the highest mass gain of 9.91 plus or minus 1.96 m.w.e.a.-1 and HPN-4 glacier recorded the highest mass loss of -8.9 plus or minus 1.96 m.w.e.a.-1. However, there is a high uncertainty in the elevation values in the DEM due to the rugged nature of the terrain and presence of the heavy snow cover
A basin-specific characterization of the subsurface geology of potential reservoir locations in George County, Mississippi by Adam D Lenz( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

The preliminary assessment for reservoir sites in George County targeted three basins within the county as the initial focus of the research study: Big Creek, Big Cedar Creek, and Escatawpa River basins. As a portion of the reservoir study, this study was a basin-specific geological assessment of the three basins within George County through literature review, well log correlation, and a county wide spring inventory. The goal of this study was to obtain and interpret subsurface data in order to develop detailed geologic maps and stratigraphic cross sections which aided in the site assessment and characterization of the geologic and hydro-geologic suitability of potential reservoir sites. This study concluded that the hypothesis was proved and all three selected drainage basins were potentially geologically suitable to sustain a large reservoir, therefor other factors should be taken into account to determine specific reservoir location such as stream discharge and water quality
Identification of acid volatile sulfides as a predictor of sediment oxygen demand and comparison of the degree of pyritization between Weeks Bay, AL and Old Tampa Bay, FL by Erin Leigh Anderson( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

Weeks Bay, AL is a governmentally protected reserve near Mobile Bay, AL, while Old Tampa Bay, FL is an urbanized estuary, located along the western coast of Florida. Estuary health is important to local economies and the health of local marine life, with an emphasis on low levels of eutrophication. Sediment oxygen demand (SOD) is usually measured to qualify the environmental health of estuaries, but SOD is timeconsuming and expensive. Average acid volatile monosulfides (AVS) concentrations were found to accurately predict SOD variances. The Degree of Pyritization (DOP) is a measure of long-term sediment oxidation conditions, which indicates normal estuary state. Despite the urban land use practices of these two bays, the DOP of each bay is similar
Factors influencing gypsum crystal morphology within a flue gas desulfurization vessel by Kinsey M Byrd( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

Flue gas desulfurization (FGD) is utilized by the coal-powered generating industry to safely eliminate sulfur dioxide. A FGD vessel (scrubber) synthetically creates gypsum crystals by combining limestone (CaCO₃), SO₂ flue gas, water and oxygen resulting in crystalline gypsum (CaSO₄ ∙ 2H₂O), which can be sold for an economic return. Flat disk-like crystals, opposed to rod-like crystals, are hard to dewater, lowering economic return. The objectives were to investigate the cause of varying morphologies, understand the environment of precipitation, as well as identify correlations between operating conditions and resulting unfavorable gypsum crystal growth. Results show evidence supporting airborne impurities due to the onsite coal pile, the abundance and size of CaCO₃ and high Ca:SO₄ ratios within the scrubber as possible factors controlling gypsum crystal morphology. In conclusion, regularly purging the system and incorporating a filter on the air intake valve will provide an economic byproduct avoiding costly landfill deposits
Influence of coastal processes on speleogenesis and landforms in the Caribbean Region by Patricia Kambesis( )

1 edition published in 2014 in English and held by 1 WorldCat member library worldwide

Evolution of rocky coastlines is controlled by littoral, biological and fluvial processes. Resultant landforms are overprinted and/or new ones formed as a result of changes in sea level caused by glacioeustasy and/or local tectonics. On carbonate coasts, chemical erosion in the form of karstification takes on a dominant role. Type of karstification is an important factor in understanding carbonate coast evolution and landform development so it is critical to identify type of karstification. In this research, fractal indices were used to distinguish cave and thus karstification type. It was determined that fractal indices effectively differentiated cave types and the indices were used to distinguish cave types at study sites on Barbados, the ABC Islands (Aruba, Bonaire, Curaçao) and the Caribbean coast of the northeast Yucatan peninsula, Mexico. This research evaluated caves located in the phreatic, epiphreatic and vadose zones of the northeast coast of Quintana Roo, Mexico to determine the relationship between the caves and to coastal processes. Three distinct coastal landforms associated with caves on the study sites were evaluated to quantify and model the interplay of littoral, fluvial and karstic processes and cave and karst development. On Barbados, the combination of surface fluvial processes, and mixing-zone and fluvial-karstic dissolution, resulted in the formation of gullies. Some gullies contained caves in their bounding walls and/or served as points of recharge to fluvial caves. Bokas of the ABC islands are distinctive geomorphic structures that formed from the interplay of fluvial, littoral and mixing zone karstification. The morphology of the bokas was a function of dominant geomorphic process. The caletas of the Yucatan Caribbean were formed by karstification processes that also produced features with mixing-zone-like morphologies but with fluvio-karstic function. The results of this research expand the Carbonate Island Karst Model (CIKM), which explains eogenetic dissolutional processes and landforms on small carbonate islands, to one that includes carbonate islands of all sizes, and carbonate continental coasts
Slope stability analysis of spoil dragline bench in lignite coal mine, Choctaw County, Mississippi by Maria Laila Jover( )

1 edition published in 2012 in English and held by 1 WorldCat member library worldwide

Spoil pile stability in an open pit coal mine is a common problem and the Red Hills Lignite Mine in Choctaw County is no exception. The mine has had spoil stability problems of their spoil dragline bench since the beginning of their activity in 2002. They have managed to stabilize the conditions by installing prefabricated vertical drains (PVD) to consolidate the layers below the spoil dragline bench, which tended to fail due to an increase in pore water pressure. In this study, the capability of analyzing and predicting future pore water pressure conditions is examined. With the use of the stability model Slope/w and local stress calculations, the predictability of the necessity of PVDs and their spatial distribution are analyzed. The outcomes prove to be circumstantial to local pore water pressure and geology changes, therefore, the spacing between drains could be adapted to the local conditions potentially saving costs
Analysis of geospatial route reconnaissance methods of modern day battlefields by Bradley Steven Ulmer( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

Route reconnaissance has been valuable for military commanders for centuries. Engineering forces are specifically tasked to gather route reconnaissance intelligence to present to the maneuver commander. US Army Engineers presently use a variety of highly technological methods to collect, process, and present this detailed route reconnaissance intelligence. This thesis examines and analyzes the capabilities of four reconnaissance groups. Using a matrix, each of the four units is ranked based on surveys of reconnaissance officers and on the personal experience of the author of this thesis. Results show that Unit 2 (FEST-M) is the most qualified unit to collect detailed geospatial route reconnaissance of the battlefield. The ARRK/TETK software system has helped this unit rise to the top over the other reconnaissance unit types analyzed. The need for geospatial route reconnaissance will continue to be a part of the modern day battlefield and will change constantly as technology is updated
Abstracts of papers to be presented at the Meeting of the Southeastern Section of the Geological Society of America and associated societies : Jackson, Mississippi, March 14-15, 1996 by Geological Society of America( Book )

1 edition published in 1996 in English and held by 1 WorldCat member library worldwide

 
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