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 “"Street canyons"”.
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Predicting velocities and turbulent exchange in isolated street canyons and at a neighborhood scale
… the expected wind speeds in isolated, idealized street canyons. We demonstrate that flow in street canyons is driven by momentum exchange with the air above. We discuss the importance of flow separation and turbulent exchange between the urban canopy layer and the urban boundary layer for …
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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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Passive enhancement of air flow at pedestrian level in built environments
… to flow obstruction induced by buildings. Urban street canyons, the outdoor spaces formed between buildings, often have much lower wind speed than the atmospheric wind above the roof level. In tropical regions, wind plays an important role to improve outdoor thermal comfort of urban inhabitants …
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Outdoor wind speed enhancement in residential precincts in tropical cities
… by more than twofold in two-dimensional urban street canyons. In three-dimensional urban street canyons, void decks not only increase the wind speeds in the street canyons, but also along the streets. The effectiveness of void decks to increase wind speed is significantly influenced by 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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Urban Design and Outdoor Thermal Comfort in Warm Climates. Studies in Fez and Colombo
… Microclimate conditions and thermal comfort at street level were found to vary considerably within both Fez and Colombo. Apart from its old city, Fez is a dispersed city dominated by street canyons with low height-to-width ratios. This study shows that new urban areas would need to be far more …
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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 …
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Vertical greening in urban built environments
… to have improved the thermal climate of street canyons to benefit pedestrians (summer daytime cool island occurrences increased by 39% for central urban and 3.4% for suburban canyons), as well as present annual net energy use savings to the canyon buildings (between 0.8 and 5.2%). These …