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Physical and Environmental Geography Commons™
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- Alberta (1)
- Alpine lake (1)
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- Frequency (1)
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- Model evaluation (1)
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- Nutrient variability (1)
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- Paleolimnology (1)
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Articles 1 - 4 of 4
Full-Text Articles in Physical and Environmental Geography
Land Use Interactions Drive Southwestern Ontario Stream Nutrient Concentrations, Renee L. Lazor
Land Use Interactions Drive Southwestern Ontario Stream Nutrient Concentrations, Renee L. Lazor
Electronic Thesis and Dissertation Repository
Human activities have transformed the landscape and altered natural habitats through intensive land uses including agriculture and urbanization. Identifying land use drivers of tributary nutrient concentrations and describing the magnitude and direction of their relationship are critical activities to improvement management of water quality in basins draining into the Great Lakes. The overarching goal of my thesis was to quantify the cumulative influence of spatial patterns in land use and land cover on variation of nutrient concentrations in tributaries of the Great Lakes. Biweekly water chemistry samples were collected in 29 streams located in southern Ontario between May and November, …
The Preferential Loss Of Small Geographically Isolated Wetlands On Prairie Landscapes, Jacqueline N. Serran
The Preferential Loss Of Small Geographically Isolated Wetlands On Prairie Landscapes, Jacqueline N. Serran
Electronic Thesis and Dissertation Repository
Reliable estimates of wetland loss require improved wetland inventories and effective monitoring programs. To improve upon current wetland inventories, a novel method for mapping wetlands using an automated object-based approach was developed for a regional watershed located in central Alberta. This approach used digital terrain objects derived from Light Detection and Ranging (LiDAR) data for which 130,157 wetlands were identified. Using this LiDAR derived wetland inventory, wetland loss estimates (% number and % area) were obtained by applying a wetland area vs. frequency function to the wetland inventory for the watershed. Using this power law, it was found that historically, …
A Sensor View Model To Investigate The Influence Of Tree Crowns On Effective Urban Thermal Anisotropy, Daniel R. Dyce
A Sensor View Model To Investigate The Influence Of Tree Crowns On Effective Urban Thermal Anisotropy, Daniel R. Dyce
Electronic Thesis and Dissertation Repository
A sensor view model is modified to include trees using a gap probability approach to estimate foliage view factors and an energy budget model for leaf surface temperatures (SUMVEG). The model is found to compare well with airborne thermal infrared (TIR) surface temperature measurements. SUMVEG is used to investigate the influence of trees on thermal anisotropy for narrow field-of-view TIR remote sensors over treed residential urban surfaces. Tests on regularly-spaced arrays of cubes on March 28 and June 21 at latitudes of 47.6°N and 25.8°N show that trees both decrease and increase anisotropy as a function of …
Nitrate Sources And Lake Response In High Elevation Lakes, Uinta Mountains, Utah, Beth J. Hundey
Nitrate Sources And Lake Response In High Elevation Lakes, Uinta Mountains, Utah, Beth J. Hundey
Electronic Thesis and Dissertation Repository
Direct human activities in the Uinta Mountains, Utah, U.S.A., are limited to free-range grazing and recreation, but the larger-scale perturbations of climate warming and atmospheric deposition could also affect these remote sites. As few limnological measurements are available, it is difficult to discern whether changes in the high alpine lake ecosystems are occurring in this area. This study uses a range of paleolimnological and limnological techniques to: (1) identify the timing, nature, and causes of changes in primary production in high elevation Uinta Mountain lakes; (2) pinpoint the relative contributions of different sources of nitrate to these aquatic ecosystems; and …