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Articles 151 - 180 of 216
Full-Text Articles in Geography
Tornado Density And Return Periods In The Southeastern United States: Communicating Risk And Vulnerability At The Regional And State Levels, Michelle Bradburn
Tornado Density And Return Periods In The Southeastern United States: Communicating Risk And Vulnerability At The Regional And State Levels, Michelle Bradburn
Electronic Theses and Dissertations
Tornado intensity and impacts vary drastically across space, thus spatial and statistical analyses were used to identify patterns of tornado severity in the Southeastern United States and to assess the vulnerability and estimated recurrence of tornadic activity. Records from the Storm Prediction Center's tornado database (1950-2014) were used to estimate kernel density to identify areas of high and low tornado frequency at both the regional- and state-scales. Return periods (2-year, 5-year, 10-year, 25-year, 50-year, and 100-year) were calculated at both scales as well using a composite score that included EF-scale magnitude, injury counts, and fatality counts. Results showed that the …
How The City Of Indianapolis Came To Have African American Policemen And Firemen 80 Years Before The Modern Civil Rights Movement., Leon E. Bates
How The City Of Indianapolis Came To Have African American Policemen And Firemen 80 Years Before The Modern Civil Rights Movement., Leon E. Bates
Electronic Theses and Dissertations
This study explores a series of events that occurred in the spring of 1876. The relationship between the Indianapolis city government, the Marion County Courts, the Indianapolis Police Department, and the African American community came together to usher in changes never before envisioned. The Indianapolis Police Department (IPD) was formed in 1855, then disbanded 12 months later in a political dispute. From 1857-to-1876, the IPD was all white. These changes took place as the Reconstruction era was coming to a close. The first Ku Klux Klan was at its apex, terrorizing black communities, and Jim Crow was coming into its …
An Evaluation Of Multiple Endmember Spectral Mixture Analysis Applied To Landsat 8 Oli Images For Mapping Land Cover In Southern Africa's Savanna., Fernando Ferreira Caixeta
An Evaluation Of Multiple Endmember Spectral Mixture Analysis Applied To Landsat 8 Oli Images For Mapping Land Cover In Southern Africa's Savanna., Fernando Ferreira Caixeta
Electronic Theses and Dissertations
Mapping land cover in southern Africa’s savannas using traditional pixel based remote sensing techniques can be very challenging due to the heterogeneity of its vegetation structure and the spectral difficulty in separating similar land covers across various land uses. In order to overcome these complications, a Multiple Endmember Spectral Mixture Analysis (MESMA) provides a potential remote sensing approach to quantify spectral variation in the physical environment at a subpixel level. The MESMA approach was applied in the study area of the Mayuni Conservancy, in Namibia. Results show that 32.3% of the study area is covered by photosynthetic vegetation (PV), 32.0% …
A Qualitative Analysis Of Communality In Louisville Community Gardens., Victoria Ann Montgomery
A Qualitative Analysis Of Communality In Louisville Community Gardens., Victoria Ann Montgomery
Electronic Theses and Dissertations
Environmental change and food security issues boost interest in green initiatives, which in turn motivate policy makers and the general public toward the support and maintenance of urban community gardens. In Louisville Kentucky, an urban heat island in the United States, support for community gardens requires greater community support and volunteers. Objectives and organization of community gardens vary, as issues in production and sustainability are not the same for all garden communities and are contributing factors to their degree of success. Community gardens represent elements from both communal living and community but vary in their degree of communality. Using qualitative …
Global Population Distributions And The Environment : Discerning Observed Global And Regional Patterns., Jeremiah J. Nieves
Global Population Distributions And The Environment : Discerning Observed Global And Regional Patterns., Jeremiah J. Nieves
Electronic Theses and Dissertations
Between 1990 to 2015, numerous groups used ancillary data about the environment surrounding populations to more accurately map global populations from standard census data. No comprehensive study has been undertaken to characterize the observed relationships between population density and ancillary data. Better understanding these relationships may produce more accurate population maps, focus resources on new datasets with a high probability of modelling importance, and lead to expanded end-user applications. This study examined these relationships by extracting variable importances from 36 independently run, country-specific population models from the WorldPop project’s population data. Covariate data describing urban/suburban extents were found to be …
Exchange Patterns And Relations In Collaborative Governance., Charles Wharton Kaye-Essien
Exchange Patterns And Relations In Collaborative Governance., Charles Wharton Kaye-Essien
Electronic Theses and Dissertations
Collaborative governance has received considerable attention in recent years. From environmental resource management to public safety, collaborative governance continues to play a vital role in regional problem solving. In spite of this increasing popularity previous attempts to model the political, economic, and demographic determinants of collaboration have in most cases produced inconsistent results, thereby undermining the ability to generalize from such findings. Additionally, our understanding of the relational patterns that emanate from collaborative agreements remains fairly rudimentary. The main objective of this research is to address some of the gaps in the literature and improve our understanding of collaborative governance …
Crafted Places: The Use Of Place In Wisconsin Craft Beer Marketing, Joseph A. Quintana
Crafted Places: The Use Of Place In Wisconsin Craft Beer Marketing, Joseph A. Quintana
Electronic Theses and Dissertations
This research examines place-related themes used in craft beer marketing initiatives in Wisconsin. "Place" describes the emotions and perceptions individuals hold in certain locations. Place theory, despite being universally experienced, is relatively understudied. Furthermore, this project is grounded in the recent neolocal movement - a movement towards local culture, and away from national homogenous culture. Broadly, this paper aims to understand the perceptual linkages between people and "their" place. In order to understand place and neolocal themes within these linkages, this project analyzes how individual beer names, beer-label imagery, and beer-related advertisements use familiar places to link products with a …
Growing Food Security: The Impact Of Community Gardens On Food Security In Denver, Colorado, Grace Catherine Kellner
Growing Food Security: The Impact Of Community Gardens On Food Security In Denver, Colorado, Grace Catherine Kellner
Electronic Theses and Dissertations
Community gardens increase mental health, physical health and social inclusiveness and cohesiveness, while directly connecting gardeners to their environment. In some U.S. cities gardens additionally increase community and individual food security by providing fresh food to those who struggle to feed themselves and their families. This study examined the relationship between community gardens and increased food security in Denver, and is one of the first studies of its kind in this location. Specifically, I investigated who participates in community gardens, why they participate, whether gardens are accessible, and whether community gardens have the potential to improve individual and community food …
The Spatial Distribution Of Terrestrial Stable Carbon Isotopes In North America, And The Impacts Of Spatial And Temporal Resolution On Static Ecological Models, Sydney M. Firmin
The Spatial Distribution Of Terrestrial Stable Carbon Isotopes In North America, And The Impacts Of Spatial And Temporal Resolution On Static Ecological Models, Sydney M. Firmin
Electronic Theses and Dissertations
Due to the unique spatial and temporal characteristics of ecological phenomena, the extent and grain size of spatial data sets essentially filter the observations. This thesis examines the impacts of temporal and spatial resolution on the modeling of terrestrial stable carbon isotopic landscapes (isoscapes). I model the distribution of leaf stable carbon isotope composition (delta13C) for the continent of North America at multiple temporal and spatial resolutions. I generate each delta13C isoscape variation by first predicting the relative abundance of C3/C4 vegetation cover using monthly climate grids, crop distribution/type grids, and remote sensing data of plant …
Identifying Data Centers From Satellite Imagery, Adam Buskirk
Identifying Data Centers From Satellite Imagery, Adam Buskirk
Electronic Theses and Dissertations
We develop two different descriptors which can be utilized to describe satellite imagery. The first, the differential-magnitude and radius descriptor, describes a scene by computing the directional gradient of the scene with respect to a vector field whose solutions are circles around a pixel to be described, and then counts pixels in a descriptor matrix according to the magnitude of this gradient and the distance at which this magnitude occurs. The second, the radial Fourier descriptor, extracts from the scene a sequence of annuloid sectors, and uses this to approximate the behavior of the image on a circle around the …
Land Cover Land Use Change And Soil Organic Carbon Under Climate Variability In The Semi-Arid West African Sahel (1960-2050), Amadou M. Dieye
Land Cover Land Use Change And Soil Organic Carbon Under Climate Variability In The Semi-Arid West African Sahel (1960-2050), Amadou M. Dieye
Electronic Theses and Dissertations
Land Cover Land Use (LCLU) change affects land surface processes recognized to influence climate change at local, national and global levels. Soil organic carbon is a key component for the functioning of agro-ecosystems and has a direct effect on the physical, chemical and biological characteristics of the soil. The capacity to model and project LCLU change is of considerable interest for mitigation and adaptation measures in response to climate change. A combination of remote sensing analyses, qualitative social survey techniques, and biogeochemical modeling was used to study the relationships between climate change, LCLU change and soil organic carbon in the …
Simulating The Impacts Of Land-Use Land-Cover Changes On Cropland Carbon Fluxes In The Midwest Of The United States, Zhengpeng Li
Simulating The Impacts Of Land-Use Land-Cover Changes On Cropland Carbon Fluxes In The Midwest Of The United States, Zhengpeng Li
Electronic Theses and Dissertations
Understanding the major drivers of the cropland carbon fluxes is important for carbon management and greenhouse gas mitigation in agriculture. Past studies found that agricultural land-use and land-cover (LULC) changes, such as changes in cropland production technologies, tillage practices, and planted crop species, could have large impacts on carbon fluxes. However, the impacts remain highly uncertain at regional to global scales. Satellite remote sensing is commonly used to create products with geospatial information on LULC changes. This geospatial information can be integrated into biogeochemical models to simulate the spatial and temporal patterns of carbon fluxes. We used the General Ensemble …
Using Remote Sensing And Biogeographic Modeling To Understand The Oak Savannas Of The Sheyenne National Grassland, North Dakota, Usa, Mandira Sigdelphuyal
Using Remote Sensing And Biogeographic Modeling To Understand The Oak Savannas Of The Sheyenne National Grassland, North Dakota, Usa, Mandira Sigdelphuyal
Electronic Theses and Dissertations
Oak savannas are valuable and complex ecosystems that provide multiple ecosystem goods and services, including grazing for livestock, watershed regulation, and recreation. These ecosystems of the woodland-prairie ecoregion of the Midwestern United States are, however, in danger of disappearing. The Sheyenne National Grassland, North Dakota, a protected Prairie grassland-savanna, is a representative of such rare habitats, where oak savanna is found at the landscape scale. In this research, I map the distribution patterns of oak savanna in the Sheyenne using a combination of remote sensing and geospatial datasets, including landscape topography, soils, and fire disturbance. Further, I interpret the performance …
Monitoring Global Forest Land-Use And Change, Erik J. Lindquist
Monitoring Global Forest Land-Use And Change, Erik J. Lindquist
Electronic Theses and Dissertations
Earth’s forests contain nearly three-fourths of the World’s floral and faunal diversity, function as a large carbon sink capable of mitigating the effects of global climate change, affect local and regional physical and chemical cycles and provide wood and non-wood products. However, humans are now capable of modifying their environment in ways more impactful and at rates faster than at any other time in history. Consistent and comparable estimates of global forest land-use and change are critical for monitoring human impacts on the Earth system. International treaties and reporting requirements aimed at safeguarding the delivery of forest-related ecosystem services depend …
Developing Management Guidelines That Balance Cattle And Timber Production With Ecological Interests In The Black Hills Of South Dakota, Kurt M. Chowanski
Developing Management Guidelines That Balance Cattle And Timber Production With Ecological Interests In The Black Hills Of South Dakota, Kurt M. Chowanski
Electronic Theses and Dissertations
Forested lands contribute to the United States (US) economy by providing livestock and timber production. Livestock grazing of forested lands has been widespread throughout the western US since the settlement era, and currently occurs on 51.4 million hectares (ha) representing 16% of all US grazing land and 22% of all US forested land (Nickerson et al. 2011). While livestock grazing and timber harvest are occurring on a substantial amount of forested land, relationships between management practices, tree stocking, timber production, forage production, livestock grazing, wildlife, aesthetics, and ecological integrity are not well documented. Whether considering timber or cattle, finding a …
Predictive Modeling Of Sinkhole Hazards Using Synthetic Aperture Radar Interferometry (Insar) Subsidence Measurements And Local Geology, William G. Powell
Predictive Modeling Of Sinkhole Hazards Using Synthetic Aperture Radar Interferometry (Insar) Subsidence Measurements And Local Geology, William G. Powell
Electronic Theses and Dissertations
The mining of salt domes provides economically important resources through salt and brine production and storage of petroleum products as part of the U.S. Strategic Petroleum Reserve. In order to assess the risk to nearby communities for potential of salt dome collapse, it is important to understand the growth of the Bayou Corne sinkhole and the conditions surrounding the Napoleonville Salt Dome that may have exacerbated its formation. The Bayou Corne sinkhole in Assumption Parish, Louisiana has been expanding since it formed overnight on 2 August 2012. Growing from slightly over 2 acres to more than 30 acres today, the …
Mapping Debris-Covered Glaciers In The Cordillera Blanca, Peru : An Object-Based Image Analysis Approach., Donald J. Biddle
Mapping Debris-Covered Glaciers In The Cordillera Blanca, Peru : An Object-Based Image Analysis Approach., Donald J. Biddle
Electronic Theses and Dissertations
Accurate remote-sensing based inventories of glacial ice are often hindered by the presence of supraglacial debris cover. Attempts at automated mapping of debris-covered glacier areas from remotely-sensed multispectral data have met with limited success due to the spectral similarity of supraglacial debris to nearby bedrock, moraines, and fluvial deposition features. Data-fusion approaches leveraging terrain and/or thermal data with multispectral data have yielded improved results in certain geographic regions, but remain unproven in others. This research builds on the data-fusion approaches from the literature and explores the efficacy of object-based image analysis (OBIA) and tree-based machine learning classifiers using Landsat OLI …
Using Kriging, Cokriging, And Gis To Visualize Fe And Mn In Groundwater, Crystal Johnson
Using Kriging, Cokriging, And Gis To Visualize Fe And Mn In Groundwater, Crystal Johnson
Electronic Theses and Dissertations
For aesthetic, economic, and health-related reasons, allowable concentrations of iron (Fe) and manganese (Mn) found present in drinking water are 0.3 mg/L and 0.05 mg/L, respectively. Water samples taken from private drinking wells in the rural communities within Buncombe County, North Carolina contain amounts of these metals in concentrations higher than the suggested limits. This study focused on bedrock geology, elevation, saprolite thickness, and well depth to determine factors affecting Fe and Mn. Using ArcGIS 10.2, spatial trends in Fe and Mn concentrations ranges were visualized, and estimates of the metal concentrations were interpolated to unmonitored areas. Results from this …
Discovering Rock Features With Geophysical Exploration And Archaeological Testing At The Mississippian Pile Mound Site, Upper Cumberland Plateau, Tennessee, Jeremy G. Menzer
Discovering Rock Features With Geophysical Exploration And Archaeological Testing At The Mississippian Pile Mound Site, Upper Cumberland Plateau, Tennessee, Jeremy G. Menzer
Electronic Theses and Dissertations
The Pile Mound survey includes magnetometry paired with targeted ground-penetrating radar (GPR) and electromagnetic induction (EMI) surveys of the mound and testing of associated features over the ca. 6.5 ha site. The GPR survey discovered six rock features (five large rock features within the mound and one marking the outside of the mound). Knowledge of mounds in the Upper Cumberland Plateau (UCP) is lacking—the closest other studied sites are at the Corbin Site, Croley-Evans, Bell Site, and Beasley Mounds, approximately 75 – 100 km away. However, the most similar mound construction is found at Corbin and Cherokee sites, some 175 …
Pedestrian Mobility In Denver: A Mixed Methods Approach, Meghan Elizabeth Mooney
Pedestrian Mobility In Denver: A Mixed Methods Approach, Meghan Elizabeth Mooney
Electronic Theses and Dissertations
This research is rooted in the bigger issues of climate change, urban sustainability, and the drive to make Denver more pedestrian centered despite sprawled conditions. More specifically, this research is driven by (1) the need for a holistic, multi-dimensional, and mixed geographic perspective of pedestrian mobility, (2) the lack of qualitative data regarding pedestrian mobility and (3) a need for a better understanding of the feedback between physical and perceived space and how this influences walking behavior. Given these motivations, I deploy a multidimensional framework for assessing pedestrian mobility in Denver’s Transit Oriented Development (TOD) sites, whereby there are two …
When Wells Run Dry: Water And Tourism Along The Western Coast Of Nicaragua, Gary Thomas Lavanchy
When Wells Run Dry: Water And Tourism Along The Western Coast Of Nicaragua, Gary Thomas Lavanchy
Electronic Theses and Dissertations
This dissertation uses a political ecology approach to examine the relationship between tourism development and groundwater in southwest Nicaragua. Tourism in Nicaragua is a booming industry bolstered by ‘unspoiled’ natural beauty, low crime rates, and government incentives. This growth has led to increased infrastructure, revenue, and employment opportunities for many local communities along the Pacific coast. Not surprisingly, it has also brought concomitant issues of deeper poverty, widening gaps between rich and poor, and competition over natural resources. Adequate provisions of freshwater are necessary to sustain the production and reproduction of tourism; however, it remains uncertain if groundwater supplies can …
The Effects Of Surf-Driven Development On The Local Population Of Playa Gigante, Nicaragua, Nicholas Harrison William Earhart
The Effects Of Surf-Driven Development On The Local Population Of Playa Gigante, Nicaragua, Nicholas Harrison William Earhart
Electronic Theses and Dissertations
In many of the world's developing countries, tourism is starting to play a more important role in the improvements of the local and national economies. One of these countries that have started to view tourism as a way to alleviate poverty throughout the country is Nicaragua. With miles of beaches, large swaths of pristine rainforests and beautiful volcanoes, Nicaragua has plenty to offer to travelers from all over the world. One of the sectors of tourism that has rapidly expanded in recent years is that which caters specifically to North American and European surfing tourists, who travel to Nicaragua for …
Impacts Of Urban Areas On Vegetation Development Along Rural-Urban Gradients In The Upper Midwest: 2003-2012, Cole Krehbiel
Impacts Of Urban Areas On Vegetation Development Along Rural-Urban Gradients In The Upper Midwest: 2003-2012, Cole Krehbiel
Electronic Theses and Dissertations
Between one-third and one-half of Earth’s land surface has been directly altered by humans, with the remainder comprised of “human-dominated ecosystems” (Vitousek et al. 2008). Earth’s population has surpassed seven billion, projected to increase by 2.5 billion by 2050 in urban areas alone (United Nations 2014). The rapid urbanization of our planet drives global environmental changes in hydrosystems, biodiversity, biogeochemical cycles, land use and land cover, and climate (Grimm et al. 2008). Urban areas alter local atmospheric conditions by modifying surface albedo and consequently evapotranspiration, releasing energy through anthropogenic heat sources, and increasing atmospheric aerosols, leading to increased temperatures in …
The Biogeography And Diversity Of Termites In Southern Africa, Brianna Lind
The Biogeography And Diversity Of Termites In Southern Africa, Brianna Lind
Electronic Theses and Dissertations
Termites (Blattodea: Termitoidae) are socially complex insects that are morphologically diverse and live in colonies. They represent a highly specialized form of cockroach that organizes into castes (distinct social groups including workers, soldiers, queen, etc.) that have specific roles within the colony (Eggleton 2010). Globally more than 2,600 species of termites have been described in over 280 genera and, while termites can occur in most climatic zones warmer than tundra, their greatest abundance and ecological significance is in the tropics (Kambhampti and Eggleton 2000). Termites impact many processes, including nutrient cycling, water dynamics, and soil porosity; in African savannas it …
Examining The Spatial Aspects Of Residential Energy Efficiency: Gis And Survey Analysis In Boulder County, Colorado, Walter Stanley Scheib
Examining The Spatial Aspects Of Residential Energy Efficiency: Gis And Survey Analysis In Boulder County, Colorado, Walter Stanley Scheib
Electronic Theses and Dissertations
The completion of residential energy efficiency upgrades leads to multifaceted benefits including cost and energy savings, increased household comfort, health benefits, and reduced CO2 emissions. As a result of these benefits, state and local energy efficiency programs across the United States are striving to increase the widespread adoption of energy efficiency upgrades by homeowners. Many program strategies for widespread adoption are informed by case studies of other successful energy efficiency programs. These program strategies would benefit from the additional insight provided by spatial analysis, but a spatial perspective is currently underutilized by energy efficiency programs across the United States. This …
An Analysis Of The Potential Effects Of Urbanization On The Water Quality Of The Middle Fork Of Beargrass Creek, Louisville, Kentucky., Olivia Brooks
An Analysis Of The Potential Effects Of Urbanization On The Water Quality Of The Middle Fork Of Beargrass Creek, Louisville, Kentucky., Olivia Brooks
Electronic Theses and Dissertations
This thesis examined whether water quality diminished as a result of increasing pollution downstream along the Middle Fork of Beargrass Creek, Louisville, Kentucky in response to urbanization. Samples of key water quality indicators/pollutants were collected for 12 weeks (November - January) along the Middle Fork of Beargrass Creek at three different stream gauges. A spatial and statistical analysis was performed to verify any significant correlations between the water quality indicators and pollutants, and whether basin wide landcover/sewer outlet numbers led to an increase in these indicators downstream. Following ANOVA and Kruskal-Wallis statistical testing it was established that turbidity significantly increased …
The Impact Of Internet Gis On Access To Water Quality Information, Joseph H. Hoover
The Impact Of Internet Gis On Access To Water Quality Information, Joseph H. Hoover
Electronic Theses and Dissertations
Empowering citizens to comprehend complex environmental issues affecting their daily lives is essential to sustaining a healthy and informed public. The work of many environmental nongovernmental organizations (ENGOs) and institutions of higher education (IHEs) center around helping their stakeholders become informed of, and in turn, better understand complex environmental problems. However, providing individual stakeholders with knowledge about environmental issues that is easily accessible and understandable represents a recurring challenge in today's society. As a result, a gap continues to exist between that which is known about environmental problems and the public's awareness and understanding of those issues. Arsenic contamination of …
Changing Geographic Patterns Of High- And Low-Income Groups In Eight United States Metropolitan Areas, Taylor J. Hafley
Changing Geographic Patterns Of High- And Low-Income Groups In Eight United States Metropolitan Areas, Taylor J. Hafley
Electronic Theses and Dissertations
Income segregation produces unequal social outcomes and has steadily increased since the 1970s. High-poverty neighborhoods suffer from low performing schools, fewer jobs, an evaporation of local role models (Wilson 1987; Reardon and Bischoff 2011a). Recent evidence suggests growing income inequality influences the segregation of affluence more than the segregation of poverty (Reardon and Bischoff 2011b). Metropolitan areas that display strong population and economic growth are susceptible to higher levels of income inequality. I use three unique quantitative approaches to measure the segregation of affluence and poverty in a comparison of four metropolitan areas exhibiting strong growth to four metros with …
Evacuation And Shelter In Place Modeling For A Release Of Uranium Hexafluoride, Joseph B. Harris
Evacuation And Shelter In Place Modeling For A Release Of Uranium Hexafluoride, Joseph B. Harris
Electronic Theses and Dissertations
Evacuation and sheltering behaviors were modeled for a hypothetical release of uranium hexafluoride (UF6) from Nuclear Fuel Services (NFS) in Erwin, Tennessee. NFS down-blends weapons grade Cold War-era nuclear fuel material and processes highly-enriched uranium occasionally using UF6 onsite. Risk associated with a chemical release to the surrounding residential population was assessed by running 2 scenarios involving an airborne release of UF6 to compare evacuation and sheltering in place actions as effective survival strategies. Risk is minimal and evacuation is recommended for people within a 2-mile radius of the release point. Shelter in place actions are recommended for all critical …
Greening Louisville's East Market District : A Comparative Assessment Of Sustainability., Ashley O. Dale
Greening Louisville's East Market District : A Comparative Assessment Of Sustainability., Ashley O. Dale
Electronic Theses and Dissertations
The East Market District located in Louisville, KY is currently undergoing a multi-million dollar urban regeneration. This transformation is being marketed as a primer sustainable neighborhood with the goal of serving as a model for other cities in the United States. As result of these changes, it is imperative to analyze the concept of sustainability from a variety of stakeholder perspectives utilizing content analysis on interviews and LEED Neighborhood Scorecard. Utilizing these methods, the central goal of this study is to understand the various interpretation of sustainability within this neighborhood. The findings observed via the critical assessment of the LEED …