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 10 of 10 for “"canopy layer"”.
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An analysis of quadrotor flight in the urban canopy layer
This thesis presents two distinct bodies of work concerning quadrotor flight in urban wind fields. The first attempts to characterize a quadrotor's ability to exploit urban wind fields for improved flight performance. A computational fluid dynamics model is used to obtain a wind field estimate …
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Predicting velocities and turbulent exchange in isolated street canyons and at a neighborhood scale
… and turbulent exchange between the urban canopy layer and the urban boundary layer for removing heat and pollutants from street canyons. Next, we introduce a method to parameterize this exchange and extend this work to more realistic street canyons and idealized neighborhoods. We evaluate …
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Study of the atmospheric boundary layer processes over sloping terrain covered by sparse canopy
… roughness object of the research is a sparse canopy layer evolving in time along the vegetative season, and characterized by a multiplicity of temporal and spatial scales influencing the properties of the turbulent fluxes. Both experimental and modelling approaches characterize the study …
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Impact of pavements on the urban heat island
… can be studied at three elevations – surface, canopy layer and boundary layer – with Canopy Layer UHIs (CLUHIs) being the most significant as most human activity takes place in this layer. CLUHIs are pronounced during nighttime and smaller during daytime. In the study of sustainable pavements, …
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Reimagining Urban Leftover Spaces Under Overpasses: Mitigating Urban Heat Islands and Heatwaves Through Green Space Transformation
… impacts public health, especially in the Urban Canopy Layer (UCL). Recent research has investigated the contribution of microclimate parametric in specific urban typologies such as plazas and streets. However, the wasted under-bridge space, which is hard to utilize and usually deemed an obstacle …
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Quantifying exchange processes in the urban canopy layers of dense neighborhoods
… urban areas, weak exchange between the urban canopy layer (UCL) and the urban boundary layer (UBL) above it results in insufficient removal of heat and pollutants. The magnitude of the exchange processes between the UCL and the UBL is directly related to the built environment that is devised …
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Woody Species Diversity, Forest and Site Productivity, Stumpage Value, and Carbon Sequestration of Forests on Mined Lands Reclaimed Prior to the Passage of the Surface Mining Control and Reclamation Act of 1977
… each region with 14 to 15 tree species in the canopy. Canopy richness of eastern mined sites was less than that on midwestern mined sites (12 species compared to 17 species, respectively). Species richness of the understory and woody ground layer were similar between sites planted to pines …
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Taxonomic homogenization of plant communities in Illinois wetlands and the role of wetland compensation
… L. and the decline of several other species. The canopy layer of floodplain forests has also homogenized as Celtis occidentalis L. has increased in importance. While wetlands did display patterns of changing dissimilarity that would be consistent with internal, within-site homogenization, these …
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Development of mechanistic energy balance models for grassland
… production and impacts of climate change. Two-layer models were developed, solving simultaneously for the energy balances at a) the soil surface and b) an equivalent canopy layer. Two distinct version of this basic two-layer model were developed. The simpler non-interacting (NACT) model assumes …
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Predicting Multi-trophic Consequences of an Emerging Disease
… cases observed on Persea borbonia, a common sub-canopy tree found in many Coastal Plain habitats. This species is also known to be the primary larval host of the palamedes swallowtail (Papilio palamedes). While infection rates and crown dieback are catastrophically high (>90%), basal resprouting …