Spatio-temporal variation of urban heat island effects in Fangchenggang City, Guangxi Zhuang Autonomous Region
Ming SUN1(), Min XIE2(), Meihua DING1, Wenlong XU3, Siqi HUANG4, Fei GAO5
1. Guangxi Meteorological Disaster Mitigation Institute/Remote Sensing Application and Validation Base of National Satellite Meteorological Center, Nanning 530022,China 2. Guangxi Climate Center, Nanning 530022,China 3. Fangchenggang Meteorological Bureau, Fangchenggang 538001, China 4. School of Geography and Remote Sensing, Nanjing University of Information & Technology, Nanjing 210044, China; 5. Flood Control and Drought Relief Office of Jiangsu Province, Nanjing 210029, China
To study the spatio-temporal variation of urban heat island effects in Fangchenggang City from 2001 to 2015,the authors used the remote sensing methods to monitor the variation characteristics of urban heat island effects in Fangchenggang City for a period of 15 years. The land surface temperature(LST)was retrieved using remote sensing images(Landsat5 TM and Landsat8 OLI) acquired in three periods of 2001, 2008 and 2015. Then, both urban heat island intensity and urban-heat-island ratio index were constructed to analyze the evolution characteristics of heat island effect in the past 15 years from three aspects: the space-time distribution and area variation of heat island intensity, the development characteristics of urban-heat-island ratio index and the influence of underlying surface condition on heat island effect. Some conclusions have been reached: ① Urban area exhibits a trend of rapid expansion in the study area. ② The urban heat island intensity increases year by year, especially in Gangkou District, where annual growth rate reaches 26.72%. ③ The urban-heat-island ratio index is rising year by year in all districts, among which, Dongxing reaches the highest value of 0.62. ④ Cooling effects are obviously for both urban green space and water body, but the operating distance and cooling amplitude of water body are larger than those of green space. However, the proportion of urban vegetation and water of the study area is markedly low. The research results may provide scientific and reasonable proposals for Fangchenggang government's aim of reaching the goal of creating a national garden city.
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