Development of a High-resolution Meteorological Model for Urban Heat Island Effect Assessment
Refereed conference paper presented and published in conference proceedings


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AbstractFacing rapid urbanization, sustainable urban developments become important in urban planning. To tackle urban climate issues in a planning context, a meteorological model with high resolution is useful for evaluating different planning scenarios. This study used the Weather Research and Forecast (WRF) with a single-layer urban canopy model to simulate summer meteorological conditions in Hong Kong, downscaling the spatial resolutions from 4.5 km to 500 m. Hong Kong (HK) was taken as an example due to its high building density in a sub-tropical climate region. The model results were compared against measurements at 25 weather stations. We quantified the urban heat island effect
(UHI) in the summer in 2009, and estimated the resultant health impacts based on a temperature response function. The model results and measurements show a good agreement with an index of agreement of 0.71 and a percentage difference of mean temperature of 1.33%. Our analysis estimated that the hourly temperature in urban areas (29.6 deg C) is higher comparing to that in rural areas (28.1 deg C). The Urban Heat Island Intensity (UHII) was estimated to be 1.6蚓 on average. The UHI results in different Primary Planning Units show a north-south gradient pattern over Hong Kong: the highest UHII (1.7 C deg) in northern part of HK, whereas the lowest UHII (0.8 C deg) in southern part of HK. We found UHII correlates well with urban area size instead of population, highlighting that policy makers of highdensity
cities should pay attention to urban area size when tackling UHI. In addition, UHI was estimated to cause 75 [95%C.I. 22-158] mortalities in summer. Of which, ~55% of the UHI-related health impact occurs in New Territories, while 39% and 6% of the impact happen in Kowloon and Hong Kong Island, respectively. The results provide critical implications for urban planners to mitigate UHI in cities, especially in less developed countries.
Acceptance Date04/10/2014
All Author(s) ListYIM Hung Lam Steve, LAI Kwok Lung, REN Chao
Name of ConferencePLEA 2014: 30th International Conference on Passive and Low Energy Architecture
Start Date of Conference16/12/2014
End Date of Conference18/12/2014
Place of ConferenceAhmedabad
Country/Region of ConferenceIndia
Year2014
Month12
Day16
Place of PublicationIndia, Ahmedabad
Pages8
LanguagesEnglish-United Kingdom
Keywordsurban heat island, urban meteorological model, high resolution

Last updated on 2018-27-06 at 16:28