ASSESSING THE RELATIONSHIP BETWEEN URBAN GREEN SPACE AND URBAN HEAT ISLAND IN HANOI CITY

Abstract

Uncontrolled urbanization with the encroachment of constructions has caused negative impacts on the environment, promoting a significant increase in temperature in the cities. The urban heat island (UHI) effect is making the climate in cities more extreme, increasing energy consumption and seriously affecting people's health. Green space development is considered a strategic solution to limit the negative impacts of the urban heat island effect. The main purpose of this study is to assess the relationship between urban green space and urban heat island effect in Hanoi city. The normalized vegetation difference index (NDVI) and land surface temperature (LST) extracted from the 2015 and 2020 Landsat satellite data of Hanoi city were used for analysis, comparison, and analysis to determine the role of green space in keeping the temperature down in summer temperature. Research results showed that green space plays an important role in cooling in the summer period. At the same time, the surface temperature in the non-vegetated areas is always higher than that in the vegetated areas at high levels of 2 to 3°C. The research results provide a significant source of reference material that makes an important contribution to an effective and sustainable urban planning strategy.