Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 235 for “"spatial scale"”.
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Sensitivity of Stormwater Management Solutions to Spatial Scale
… stormwater management practices at a watershed scale is challenging; LIDs are commonly designed at site scales, considering local hydrologic conditions (i.e., one LID at a time). A number of empirical studies have documented hydrologic and water quality improvements achieved by LIDs. However, …
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Effect of Spatial Scale on Hydrologic Modeling in a Headwater Catchment
… models were used to investigate (a) the issue of spatial scale in hydrologic modeling, and (b) two approaches to modeling, continuous versus event based. Two HEC-1 models were developed with a different number of subareas in each. The hydrographs generated by each HEC-1 model for a number of large …
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The spatial scale of immune gene variation within and among bottlenecked populations
… aim of this thesis is to explore different spatial scales at which pathogen-mediated selection drives the evolution of immune genes across and within populations of Berthelot’s pipit (Anthus berthelotii), a historically bottlenecked passerine endemic to the oceanic islands of the Canary, …
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Relationships Between Landscape, Spatial Scale, and Stream Water Chemistry in a Subtropical Karst System
… and anthropogenic) were quantified at three spatial scales (sub-catchment, riparian, stream reach) and related to water chemistry variables collected over a 13-month sampling period. An additional dataset was incorporated into analysis to evaluate seasonal and long-term (1984-2008) temporal …
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Spatial scale data requirements using NEXRAD (WSR-88D) for accurate hydrologic prediction in urban watersheds
… flood warning systems. Due to the improved spatial resolution of the radar, a better hydrologic prediction is possible on a real-time basis. Rainfall rates can currently be derived from radar data real-time at a resolution of 16 km2, whereas post-processing of the radar data can yield …
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The spatial scale of adaptive population differentiation in Atlantic Salmon: local adaptation in smolt migration timing
… this work is focussed toward identifying the spatial scale and extent of population genetic structuring in the species and linking this to variation in migratory behaviour.<br/>From a purely academic perspective, investigation of local adaptation in run timing is important because it reflects …
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The seasonal cycle of CO₂ fluxes in the Southern Ocean: a model spatial scale sensitivity analysis
… found to show a general CO₂ in-gassing bias and spatially uniform in most parts of the SO and hence integration over a larger surface area gave larger annual fluxes. On the contrary PERIANT05 air-sea CO₂ fluxes spatial variability was not uniform in most parts of the SO however influenced by …
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Sandbars managed for least terns within the Missouri River: evaluating the influence of fish, spatial scale and environment on habitat use
… known to attract Least Terns, yet specific small scale habitat features are thought to trigger nest habitat selection. Yet as a plunge-diving piscivore, Least Terns also rely on ready access to appropriately sized slender-bodied fish: <52 mm total length for adults and <34 mm total length for …
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Modelling the current and potential distribution of woody plants, with special emphasis on the importance of spatial scale and environmental factors
… modelling, this thesis assesses the role of spatial scale in understanding the determinants of species distribution, modelling invasion spread, and taking conservation decisions. The species distribution databases were collated in a Geographic Information System from various sources (from …
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The development and application of a simultaneous two-way coupled, discrete element method and smoothed particle hydrodynamic model for spatial scale-up dynamics of laboratory vertical stirred media detritors
… particle size reduction. The use of laboratory scale systems in the preliminary assessment of the grinding capabilities of larger industrial scale mills is common practice within the industry. For other mill types such as ball mills, methods such as the Bond test are used on laboratory scale …
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The Effects of Spatial Aggregation on Spatial Time Series Modeling and Forecasting
… of space-time modeling is determining the spatial scale of the data. This dissertation addresses the following three questions: 1) How does spatial aggregation impact the properties of the variable and its model? 2) What spatial scale of the data produces more accurate forecasts of the …
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Nesting in the Clouds: Evaluating and Predicting Sea Turtle Nesting Beach Parameters from Lidar Data
… largely remains dependent on coarse-scale image spatial resolution, particularly for habitat modeling. For habitat-specialized species, such data may not be sufficient to successfully capture the nuances of their preferred areas. Of particular concern are those species for which …
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Observations of surfzone vorticity using optical remote sensing
… vorticity at small [O(10m)] and large [O(100m)] spatial scales are presented and related to incident wave conditions and the measured underlying bathymetry. Field experiments were conducted at a sandy beach on the Atlantic Ocean, and nearshore flows were observed using optical remote sensing …
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Observations of Surfzone Vorticity Using Optical Remote Sensing
… vorticity at small [O(10m)] and large [O(100m)] spatial scales are presented and related to incident wave conditions and the measured underlying bathymetry. Field experiments were conducted at a sandy beach on the Atlantic Ocean, and nearshore flows were observed using optical remote sensing …
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Small mammal faunal stasis in Natural Trap Cave (Pleistocene-Holocene), Bighorn Mountains, Wyoming
… but evidence exists that suggests geography and spatial scale plays a role. Natural Trap Cave is a prime testing ground for observing how paleocommunities react to large-scale climate change. Natural Trap Cave has a continuous faunal record (100 ka-recent) that spans the last glacial cycle, large …
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Integrating Above and Belowground Components of Biodiversity across Spatial Scales: The Role of Host Plants in the Distribution of Arbuscular Mycorrhizal Fungi
… properties of their habitat at different spatial scales in different plant species. Network analysis revealed patterns indicative of niche-based processes structuring AM fungal communities more than neutral processes, phenotypic trade-offs between AM fungi, and of priority effects …
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Landscape composition and configuration affect nest founding but not success of bumble bee colonies in agroecosystems in the Lower Mainland of British Columbia, Canada.
… composition and configuration), and examined the spatial scale that best explained responses to the landscape. I used mixed model regression analysis to model the influence of semi-natural habitat, beneficial agriculture, suburban cover, and habitat edge density, all measured in six radii (250 m - …
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The role of eddy fluxes in the response of the atmosphere to tropical thermal forcing
… It is shown that the lack of proper phase and spatial scale of previous linear simulations can be explained to a large degree by the effects of transient eddy fluxes.
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