Sökning: "canyon model"
Visar resultat 1 - 5 av 6 avhandlingar innehållade orden canyon model.
1. Sound propagation to two-dimensional shielded urban areas: a numerical and scale model study of façade treatments
Sammanfattning : .... LÄS MER
2. Dispersion and Transformation of Traffic Exhaust Particles in the Urban Atmosphere
Sammanfattning : Ultrafine particles, their sources and fate in the atmosphere are currently key issues in atmospheric research owing to concern about their effects on human health and global climate. Traffic emissions are a dominating source of ultrafine particles, especially in urban areas. LÄS MER
3. Numerical modelling of sound propagation to closed urban courtyards
Sammanfattning : Because modern urban environments suffer from excessive levels of road traffic noise, access to closed courtyards is essential in order to offer urban sound environments of high quality with regard to health and perceived sound. To reach this quality, which is described by the quiet side definition, the 24-hour equivalent noise level should be below 45 dB(A). LÄS MER
4. Numerical study on flow and pollutant dispersion inside street canyons
Sammanfattning : This thesis analyzes the characteristics of flow pattern and vehicle-emitted pollutant dispersion in roughness surface layer. In an urban environment, wind flow and transported-pollutant source interfere strongly with buildings and other roughness elements on the surface ground, which results in complex characteristics of flow pattern and pollutant dispersion in 3D circumstances. LÄS MER
5. Prediction of Traffic Noise Shielding by City Street Canyons
Sammanfattning : Reducing the sound level on the exposed building facades due to traffic noise in cities is difficult and expensive. Creating access for the inhabitants to a quiet side can be an alternative method for reducing the annoyance. Therefore it is of interest to predict the level on shielded positions such as courtyards. LÄS MER