You've searched: Department: "Geography" Collection: ir_etd
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AuthorTitleDescriptionSubjectDate
1 Conrad, Edward C.Using species distribution models to quantify climate change impacts on the rosy-finch superspecies: an alpine obligateAnthropogenic climate change is forcing plants and animals to respond by shifting their distributions poleward or upward in elevation. An organism's ability to track climate change is constrained if its habitat cannot shift and is projected to decrease in geographic extent. Geographic distributions ...boosted regression trees; calibrated AUC; climate change impacts; Leucosticte; niche modeling; random forest regression trees2015-08
2 Carter, Vachel AshleyThe role of climate variability and disturbances on forest ecology in the intermountain westDisturbances play an integral role in regeneration and succession of many forested ecosystems in the Intermountain West region of the western United States. However, changes in climate have been shown to alter the occurrence, duration, and frequency of disturbances. The research presented here uses ...climate change; disturbance; Intermountain West; Rocky Mountains; vegetation change2016
3 Chavez, Vanessa GraceClimatic influences on two cienega complexes from northern baja california: a ~45,000 year paleoecological recordCiénegas are a type of specialized systems that are found in desert landscapes and characterized by organic-rich and waterlogged soils. The existence of these systems corresponds with stability of the hydrologic cycle in arid landscapes so that when they are active they serve as a dependable source...Baja California; ENSO; Fire; Late-glacial; Monsoon2016
4 Miller, JulieCharacterizing the relationship between Ku-band radar backscatter and snow accumulation on the Greenland ice sheetRecent accelerated mass loss offset by increased Arctic precipitation highlights the importance of a comprehensive understanding of the mechanisms controlling mass balance on the Greenland ice sheet. Knowledge of the spatiotemporal variability of snow accumulation is critical to accurately quantify ...Greenland ice sheet; Scatterometry; Snow accumulation2012-12
5 Morris, Stacy RandolphAfter the Fremont: fire and vegetation history of prehistoric abandonment and historic occupation of Range Creek Canyon, UtahPaleoecological reconstructions were used to analyze a low elevation wetland core extracted from Range Creek Canyon, Cherry Meadows, a location known to have Fremont habitation. The data presented here show the vegetation and fire regime changes within Range Creek Canyon from ca. A.D. 1166-1949, fo...Fire, Fremont; Native American; Range Creek Canyon; Vegetation2010-08
6 Nishizawa, ShizuoBonneville lake basin shoreline records of large lake and abrupt climate change eventsThis study examines lacustrine shoreline sediment records of the Bonneville lake basin in North America. One of the most straightforward, robust, and useful characteristics of lacustrine shorelines is that shoreline features always form at water's edge to mark where the lake surface level is. Hence,...Abrupt climate change events; Lake Bonneville; Lake surface area; Monsoons; Shoreline records2010-07
7 Li, YingruA multilevel analysis of China's regional inequality in a geographic information system environmentChina's reform and transition have dramatically accelerated the socioeconomic development in the last three decades. At the same time, the unequal distributions of wealth and social resources have been intensified. China's regional inequality has attracted more attention from both policy makers and ...China regional development; China economic development; China socioeconomic2012-05
8 Macharia, Anthony NjugunaReconstructing paleoenvironments using a mass-energy flux frameworkSpatial patterns in 13C/12C ratios of soil and sedimentary organic carbon are related to the woody cover distribution in a landscape and can aid in reconstructing environments. Woody cover is, in turn, controlled by climate, hydrology, and disturbance regime within an ecosystem. Geomorphology, distu...Diatoms; Palynology; Sediments; Soils; Stable isotopes; Woody cover2012-12
9 Arnold, James D.Modeling climate-fire connections within the Great Basin and Upper Colorado River Basin, Western United StatesThe Great Basin and Upper Colorado River Basin of the Western United States possess complex topography and varied fire ecology. The specific precipitation and temperature patterns that may increase the likelihood of fire occurrence and severity in this region are poorly understood. This study used a...Climate; Maxent; Modeling; Spatial; Western U.S.; Wildfire2013-05
10 Groeneveld, Joshua AndrewAn agent-based model of bicyclists accessing light-rail stations in Salt Lake CityMany of the existing transportation analysis methods rely on aggregate data analysis. While these models have been well established in the transportation community, there are many components of transportation that these methods neglect. Among these marginalized components are multimodal trips. Using...Agent-based model; Bicycle; Mulitmodal; NetLogo; Salt Lake City, Utah2011-08
11 Naisbitt, AdamAvalanche frequency and magnitude: using power-law exponents to investigate snow avalanche size proportions through time and spacePower-laws provide a means for investigating snow avalanche frequency/magnitude relationships and their contributing factors. This research uses power-laws to explore variations in avalanche size proportions through space and time, as well as investigating factors which may contribute to these var...Avalanche forecasting; Avalanche models2008-05-31
12 Carter, Vachel AshleyA paleoecological fire and vegetation history in Southeastern WyomingThe Medicine Bow Range of southeastern Wyoming acts as a conduit for vegetation migration from Colorado into southeastern Wyoming. Macroscopic charcoal and pollen from Long Lake, Wyoming were used to reconstruct past fire and vegetation changes in conjunction with local, regional and broad-scale cli...Fire; Paleoecology; Vegetation; Wyoming2010-08
13 Burgess, Evan WindamIce flow dynamics of Alaska glaciersUnderstanding long-term ice dynamic response to climate change remains of the utmost importance with respect to constraining sea level rise (SLR) projections for 2100. SLR contributions from Alaska approximate those from Greenland and may be dominated by mass losses from changes in flow dynamics. Bu...Alaska; Glaciers; Glaciology; Ice dynamics; Offset tracking; Remote sensing2013-05
14 Burgess, Ann BryantHydrologic impacts of dust on snow in the Upper Colorado River BasinWater availability is one of the most pressing scientific and societal issues facing the western United States. By 2060, population within the Colorado River Basin is expected to grow 19-48% relative to the 2010 population, significantly increasing the demand for water. Simultaneously, streamflow in...Dust; Energy balance; Snow2014-05
15 Butler, Jared ThomasThe role of early life socioeconomic status in female breast cancer incidenceThe effect of affluence upon increased breast cancer incidence is a widely studied phenomenon. However, utilizing affluence at time of diagnosis may prove noninformative due to residential mobility and variable socioeconomic status (SES) through an individual's life. Examining a cohort of women born...Breast cancer; Clustering; Incidence; Life course; Socioeconomic; Utah2013-12
16 Turrin, James BradleyFlow instabilities of Alaskan glaciersOver 300 of the largest glaciers in southern Alaska have been identified as either surge-type or pulse-type, making glaciers with flow instabilities the norm among large glaciers in that region. Consequently, the bulk of mass loss due to climate change will come from these unstable glaciers in the f...Glaciers; Climate change; Alaska2014-08
17 Higby Halseth, Deanna ReneeA paleolimnological investigation of historical environmental change in East Canyon ReservoirEast Canyon Reservoir is located 32 km east of Salt Lake City, Utah, and serves as a resource for irrigation, culinary water, and recreation. This research used paleolimnology and historical records to investigate the impacts of multiple stressors, including land clearance, dam construction and enl...East Canyon Reservoir; Paleolimnology; Remote sensing; Reservoir; Utah; Water resources2011-05
18 Housman, Ian WilsonRecent trends in the changing geographic extent of Cienegas of the United States/Mexico border regionWetlands, known as ciénegas, were once found throughout the basin and range physiographic province in southeastern Arizona, southwestern New Mexico, northern Sonora, and northwestern Chihuahua. These groundwater-dependent wetlands are now largely desiccated due to overgrazing, groundwater depletion...Ciénega; Desiccation; GIS; Landsat; Remote sensing; Wetlands2011-05
19 Huang, HaoGeographic information system spatial-temporal evolution of multiscalar patterns and determinants of foreign direct investment in ChinaThree decades of economic reforms and open door policies have made China the second largest recipient of Foreign Direct Investment (FDI). China's FDI attraction strategies merit a closer look. To fully understand the significance of FDI attraction strategies in China, distributional patterns and loc...China; Foreign direct investment; GIS; Patterns and determinants; Spatial-temporal evolution; Wuhan2014-08
20 Christiansen, Jennifer LauraSpatial and aspatial residential segregation measures: Salt Lake County 1999 to 2007Traditional aspatial segregation indexes have two weaknesses: the Modifiable Areal Unit Problem (MAUP) and the checkerboard problem. These challenges occur because of the reliance on abstract definitions of geographical boundaries. Presently, no aspatial measure exists that eliminates all challen...Diversity; Segregation in Utah2009-07-06
21 Hansen, Matthew KadeDecision tree classification of dambo wetlands using remotely sensed multispectral and topographic dataWetlands are the greatest single source of atmospheric methane (CH4), an important greenhouse gas. While the CH4 emissions from the expansive dambo wetlands of tropical Africa are likely substantial, they have not been reliably measured or estimated. Vegetation, topography, and soils vary among the ...Vegetation mapping,Uganda;Wetland ecology, Uganda; Methane,Environmental aspects, Uganda;Remote sensing,Uganda2008-08
22 Bares, RyanThe application of stable carbon isotopes as an enhanced method for statistical crossdating: a case study from Range Creek Canyon, UtahDendroarcheological samples pose a particular challenge when attempting to crossdate them against a master chronology. Previous attempts to accurately crossdate dendroarcheological samples from Range Creek Canyon have had limited success (Towner et al. 2009), due in part to the nonsignificance of th...13C; Crossdating; Denderochronology; Isotope; Range creek; Tree rings2014-12
23 Balzotti, Christopher StephenExploring the use of fine resolution nested ecological niche models to identify greater Sage-Grouse (Centrocercus Urophasianus) habitat and connectivity potential across a diverse landscapeSuitable habitat for greater sage-grouse (Centrocercus urophasianus) has been greatly reduced over a relatively short ecological scale (1800s - Present). This reduction of habitat has had a negative impact on the current distribution and connectivity of the species. There has been work to map sage-g...Climate change; Habitat model; Landscape ecology; Niche model; Sagebrush; Sage-grouse2014-12
24 Dudley, KennethMapping species across multiple dates of hyperspectral imagery using iterative endmember selection and multiple endmember spectral mixture analysisVegetation phenology results in seasonal changes in spectral reflectance. Phenology is often underutilized in hyperspectral vegetation mapping due to a lack of repeat imagery of the same region over time. Vegetation classification at the species level could benefit from introducing phenological info...Endmember selection; Hyperspectral time series; HyspIRI; MESMA; Species classification; Vegetation phenology2014-12
25 Freeman, Michael LawrenceFlow reversal events and statistical modeling of flow dynamics of hypersaline water across a constructed causeway, Great Salt Lake, Utah, USAThe hypersaline Great Salt Lake (GSL), located in the western United States, is divided into a north arm (Gunnison Bay) and a south arm (Gilbert Bay) by a 29-km earth-filled railroad causeway completed in 1959. Flow between the two bays is restricted to an 88-m wide breach at the western end of the ...flow reversals; generalized additive model; Great Salt Lake; hydrodynamics; statistical modeling2014-08
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