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Microclimatic modelling in assessing the impact of urban geometry on urban thermal environment

Sharmin, Tania, Steemers, Koen and Matzarakis, Andreas 2017. Microclimatic modelling in assessing the impact of urban geometry on urban thermal environment. Sustainable Cities and Society 34 , pp. 293-308. 10.1016/j.scs.2017.07.006

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Diversity in urban geometry can create significant variation in microclimatic conditions. Especially, in tropical warm-humid context, deep urban canyons with variable building heights perform better than uniform canyons, because taller buildings rising above those around them reduce solar gain and enhance wind speed at the pedestrian level. Field measurements in Dhaka comparing the varying traditional urban forms with the more regular formal residential areas have revealed an average air temperature (Ta) difference of 3.3 0C and a maximum difference of 6.20C, and a mean radiant temperature (Tmrt) difference of 10.00C. The aim of this paper is to understand the responsiveness of the microclimate simulation tool ENVI-met V4 in identifying the variation in urban geometry as reported in the field measurements. The study aims to make specific comparisons between the measured and the simulated data by analysing a particular challenge in complex geometry. It attempts to demonstrate how ENVImet could benefit from using the correct input as the boundary condition. While the modelling tool aims to produce good results by using synoptic weather information as boundary conditions, this study suggests that it is important to use representative data from the actual site and that hourly input of climatic variables as boundary information can produce the best results. Results show that modelling is able to predict the relative variations in Tmrt conditions between sites, although highly overestimated. However, in terms of Ta, modelling was unable to produce any variations between different urban geometry characteristics. This indicates that, although ENVI-met can produce sufficiently good results in predicting Ta when hourly forcing is used, it is unable to distinguish between the precise details in urban geometry features that can cause significant variations in microclimatic conditions in real situations. Therefore, further assessment of microclimatic variables is needed for using such modelling techniques in order to evaluate the impact of diversity in urban geometry.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Architecture
Uncontrolled Keywords: ENVI-met V4; urban geometry; morphological diversity; microclimate monitoring; tropical climate
Publisher: Elsevier
ISSN: 2210-6707
Date of First Compliant Deposit: 10 October 2019
Date of Acceptance: 13 July 2017
Last Modified: 17 Oct 2019 15:06

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