THESIS
2017
xix, 132 pages : illustrations (some color) ; 30 cm
Abstract
Due to increase in population and rapid economic development, more and more
buildings are built in developing countries. Building density and alignment will
cause wind blockage problem, resulting air pollutants are trapped within the
cities, cause poor air quality and threatening our health. The study of urban
meteorology and air quality is important to human beings on their health issues.
Cities are classified as the urban categories in the 24-class USGS land-use classification with high roughness length as the characteristics and Monin Obukhov
Similarity Theory (MOST) is traditionally applied to simulate boundary layer
dynamics based on surface energy
fluxes resulted in over-prediction in wind speed
and under-prediction in temperature in night time in the weather forecast. M...[
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Due to increase in population and rapid economic development, more and more
buildings are built in developing countries. Building density and alignment will
cause wind blockage problem, resulting air pollutants are trapped within the
cities, cause poor air quality and threatening our health. The study of urban
meteorology and air quality is important to human beings on their health issues.
Cities are classified as the urban categories in the 24-class USGS land-use classification with high roughness length as the characteristics and Monin Obukhov
Similarity Theory (MOST) is traditionally applied to simulate boundary layer
dynamics based on surface energy
fluxes resulted in over-prediction in wind speed
and under-prediction in temperature in night time in the weather forecast. Momentum and thermal drag effects together with a building energy model are
crucial to represent the presence of buildings impact on momentums and thermals in the boundary layer. In this thesis, a realistic and efficient multi-layer
approach will be introduced to the ACM2 model in the WRF model. Sensitivity
tests to the urban morphological parameters in idealized simulations are analysed
and the results are consistent to the physics. Simulations based on real urban morphological data are also performed. We will show there are significant improvements on wind prediction. The new urban scheme is proven to be realistic
and efficient especially for operational purposes.
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