Remote sensing-based green space evolution in Tangshan and its influence on heat island effect
WANG Siyao1(), ZHAO Chunlei2,3, CHEN Xia4, LIU Dan5()
1. Tangshan Meteorological Bureau, Tangshan 063000, China 2. Hebei Institute of Meteorological Sciences, Shijiazhuang 050000, China 3. Key Laboratory of Meteorology and Ecological Environment of Hebei Province, Shijiazhuang 050000, China 4. Hebei Climate Center, Shijiazhuang 050000, China 5. Fengnan District Meteorological Bureau, Tangshan 063000, China
The urban environment is an important issue in the whole world, and the urban heat island (UHI) effect is one of the important research topics. Owing to the expansion of the urban area and the increase in population, the urban heat island effect has also significantly changed. With the Landsat imageries as the data source and the central urban area of Tangshan City, Hebei Province as the main study area, this study analyzed the impacts of green space evolution on urban temperature change using the methods such as the radiative transfer equation algorithm, supervised classification, gravity center shift, and random sampling. The results are as follows. ① During the study period, the development direction and area of UHIs were roughly consistent with the scale and direction of rapid urban development. Moreover, the migration directions of the gravity centers of the UCI/UHIs were similar to those of the green space and urban area, with the migration distance of the gravity centers of UCIs greater than that of the UHIs. ② The urban green space (UGS) has been continuously lost during the study period, with the largest loss area of approximately 55.79 km2 occurring in agricultural land. Moreover, the largest increased area occurred in urban land and was approximately 47.85 km2. ③ The evolutionary trends of UCIs/UHIs were inconsistent with those of the UGS in different periods. This result may be related to the stock of green space. ④ The cooling effect on the urban surface (-0.16 ℃) induced by green space expansion was much smaller than the warming effect on the urban surface (6.37 ℃) caused by green space loss. The research results will provide a reference for urban planning in order to rationally arrange green space, retain sufficient green space, and effectively reduce the development speed of UHIs.
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