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 14 of 14 for “"street canyon"”.
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Wind-tunnel study on the influence of trees on street canyon ventilation. Focus on tree density, street canyon geometry, and wind direction
L'abstract è presente nell'allegato / the abstract is in the attachment
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A CFD Study of Pollution Dispersion in Street Canyon and Effects of Leaf Hair on PM2.5 Deposition
… grid for modeling pollution dispersion in a street canyon and (ii) investigation of the effects of leaf surface micro-characteristics, wind speed, and particle sizes on the dry deposition of fine particulate matter (PM2.5). The first of these studies focuses on reproducing the pollution …
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The significance of indoor:outdoor relationships, and physical and chemical composition in personal exposure to urban particulate matter
… sources and sinks of particulate matter, such as street dust and dust present on indoor surfaces. Simultaneous indoor and outdoor measurements of respirable particulate matter were undertaken in three buildings located in Wolverhampton City Centre. Two of the buildings are situated in a road used …
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HOW URBAN DEVELOPMENT CONTRIBUTES TO THERMAL ENVIRONMENT VARIATION ---- A CASE STUDY IN NEW YORK CITY
… standard deviation of building height and street canyon aspect ratio. On both community district and census tract level, four of the five variables (road density, impervious surface area percent, standard deviation of building height and street canyon aspect ratio) demonstrate steady …
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Impact of urban form on concentration of air pollutants within street canyons at pedestrian level
… in urban spaces, particularly within urban street canyons. Considering the above, this study postulates that there is a correlation between urban form and air quality. Therefore, the core focus of this thesis is to investigate this relationship in greater depth and to propose a set of …
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The influence of meteorology, urban topography and traffic on the variability in concentrations of a traffic-related pollutant in urban street canyons
… pollutant was undertaken in two urban street canyons located in York, U. K. During the field experiment, investigations were carried out in order to determine the influence of meteorology, urban topography and traffic on the measured concentrations of a traffic-related pollutant. The …
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Quantifying exchange processes in the urban canopy layers of dense neighborhoods
… to policy makers and urban planners, and at a street canyon scale, of interest to urban designers and architects. In addition to the repetitive neighborhood, common urban planning elements are evaluated to determine how changes in these forms affect mixing within the UCL and between the UCL and …
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Tomographic Reconstruction of 2-D Atmospheric Trace Gas Distributions from Active DOAS Measurements
… puffs and 2-D model distributions above a street canyon, respectively. For the latter case it is demonstrated how model evaluation can be possible even with a relatively small number of light paths. Contrary to the reconstruction of peak distributions regularisation becomes crucial.
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A Multi-level Analysis of Extreme Heat in Cities
… first paper of this dissertation focuses on the street canyon scale, aiming to identify the physical and vegetation parameters that have the greatest impact on changing thermal conditions in urban environments and to understand how these parameters interact with each other. Moving towards …
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MEASUREMENTS OF ATMOSPHERIC RADICALS IN AMBIENT AND INDOOR ENVIRONMENTS: OUTDOOR-INDOOR RELATIONSHIPS, INDOOR FORMATION MECHANISMS, AND INSTRUMENTAL ANALYSIS
… of traffic-associated aerosol in an urban street canyon. Meanwhile, in HOMEChem, indoor sunlight was found to induce bleach-initiated radical chemistry and enhance radical production indoors, similar to levels expected outdoors. These developments in our understanding of secondary …
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Wind- and thermal-driven air flows and the buoyancy and advection effects on air exchange within urban environments
… field experiment on the air flow within an urban street canyon was performed to examine the relationship between the dimensionless in-canyon velocity, u/U₀, where U₀ is the free stream velocity, and the thermal conditions inside the canyon. A buoyancy parameter, B, which estimates the ratio …
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Studies of urban air quality using electrochemical based sensor instruments
… data, pollution sources, and phenomena like the street canyon effect can be studied. Results from the long-term study also revealed that siting of the current fixed monitoring stations can fail to represent the actual air quality distribution and may therefore be unrepresentative. This work has …
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An operational method for assessing traffic-related air pollution in urban streets
… focused on the assessment of air quality within street canyons and other microenvironments (intersections, motorways, parking spaces, etc.), where population exposure to traffic-related pollutants is relatively high. The aim of this study was to develop a practical methodology for assessing …