Luận Văn Nghiên cứu - Thiết kế đô thị bền vững với khí hậu - HCMC

Abstract— Ho Chi Minh City (HCMC), in the south of
Vietnam, is undergoing rapid urbanization and is one of the
world’s cities most affected by climate change. A comparative
analysis among different scenarios for a case study located in a
re-development area in HCMC revealed how urban design can
contribute to reduce heat and improve thermal comfort in
urban areas. Isoline mappings made with the climate modelling
software ENVI-met have provided evidence that enhanced
street greenery has the most remarkable impact on urban
thermal comfort.
Index Terms — Climate Change, Ho Chi Minh City, Urban
Heat Island Effects, Urban Design.
I. INTRODUCTION
The impacts of Urban Heat Islands (UHI) are significant
in big cities. Reducing UHI effects will decrease energy
consumption, improve urban thermal comfort and mitigate
the impacts of climate change related to heat. There are five
main factors that cause UHI: absorption of solar radiation,
anthropogenic heat generation, thermal storage, decreased
evaporation and reduced ventilation [1]. Among these
factors, climate responsive urban design can reduce solar
radiation absorption and thermal storage through the use of
appropriate materials. Moreover, it can enhance evaporation
and ventilation through strategies such as increasing
vegetation and adjusting the building orientation. Therefore,
urban design plays an important role in mitigating UHI
effects. Through comparing different modelled urban design
scenarios, this paper demonstrates how urban design can
mitigate the impacts of UHI.
The case study is chosen in HCMC. This city is severely
affected by climate change and UHI effects [2], [3]. The
city’s annual mean temperature has been increased by 0.5
°C in 2007 compared to the period of 1991-2000 [4]. There
is a need to analyse appropriate urban design measures in
order to mitigate UHI effects in the city’s developments.
The case study is a quarter of a large-scale re-development
project, located near to the central business district of
HCMC (Fig. 1).