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Study on Effects of building morphology on Urban Boundary Layer Using an Urban Canopy Model

Acta meteorologica Sinica 2009年第3期23卷 338-349页

作者：周荣卫蒋维楣何晓凤刘罡 Department of Atmospheric Sciences Nanjing University National Climate Center China Meteorological Administration

An urban canopy model is incorporated into the Nanjing University Regional Boundary Layer Model. Temperature simulated by the urban canopy model is in better agreement with the observation, especially in the night time, than that simulated by the traditional slab model. The coupled model is used to study the effects of building morphology on urban boundary layer and meteorological environment by changing urban area, building height, and building density. It is found that when the urban area is expanded, the urban boundary layer heat flux, thermal turbu- lence, and the turbulent momentum flux and kinetic energy all increase or enhance, causing the surface air temperature to rise up. The stability of urban atmospheric stratification is affected to different extent at different times of the day. When the building height goes up, the aerodynamic roughness height, zero plane displacement height of urban area, and ratio of building height to street width all increase. Therefore, the increase in building height results in the decrease of the surface heat flux, urban surface temperature, mean wind speed, and turbulent kinetic energy in daytime. While at night, as more heat storage is released by higher buildings, thermal turbulence is more active and surface heat flux increases, leading to a higher urban temperature. As the building density increases, the aerodynamic roughness height of urban area decreases, and the effect of urban canopy on radiation strengthens. The increase of building density results in the decrease in urban surface heat flux, momentum flux, and air temperature, the increase in mean wind speed, and the weakening of turbulence in the daytime. While at night, the urban temperature increases due to the release of more heat storage.

关键词： urban canopy model urban boundary layer building morphology numerical simulation

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Improving outdoor air quality based on building morphology:Numerical investigation

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Frontiers of Architectural Research 2020年第2期9卷 319-334页

作者： Asmaa Mohammed Hassan Ashraf Abdel Fatah El Mokadem Naglaa Ali Megahed Osama Mahmoud Abo Eleinen Architecture and Urban Planning DepartmentFaculty of EngineeringPort Said UniversityPort SaidEgypt

Due to rapid urbanization around the world,high concentrations of vehicular pollutants have deteriorated the outdoor air quality,which can affect the physical and psychological well-being of *** strategies have been proposed to overcome these harmful impacts by improving the dispersion of air ***,a question arises regarding the potential effects of building morphology on the dispersion of ***,transient three-dimensional Computational Fluid Dynamics(CFD)simulations are performed to examine the effect of building morphology on PM10 *** cases with various prototypes and morphological methods are compared with a simple building form to identify the patterns of PM10 dispersion within a given time sequence under a prevailing inflow *** results indicate that the different designs of building morphology with varying Relative compactness(RC)indicator highlight the importance of considering morphological factors to improve outdoor air *** addition,the proposed prototypes can reduce PM10 concentrations by approximately 30%e90%at specific points in the studied time *** particular,the vertical,horizontal,and grid folded prototypes can be considered more effective as an approximate decrease between 70%and 90%in PM10 concentrations is observed,which reflects the influence of building morphology on improving outdoor air quality.

关键词： building morphology Morphological methods Outdoor air quality PM10 dispersion CFD simulation

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