Remote sensing monitoring based analysis of the spatio-temporal changing characteristics of regional urban expansion and urban land cover in China’s coastal zones
SHI Shushu1,2(), DOU Yinyin3, CHEN Yongqiang1(), KUANG Wenhui3
1. Space Microwave Remote Sensing System Department, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100089, China 2. University of Chinese Academy of Sciences, Beijing 100049, China 3. Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
Changes in urban expansion and urban land cover structures greatly affect the urban ecological environment and even ecological security. The highly concentrated urban population and economic activities and the resultant rapid urbanization have caused dramatic changes in urban expansion and urban land cover structures in China’s coastal zone. However, previous study data are insufficient for a clear understanding of the urban expansion and urban land cover structures in China’s coastal zone. In light of this, this study analyzed the spatio-temporal changing characteristics of the abovementioned aspects from multiple perspectives using the global urban land use/cover composites with 30 m spatial resolution (GULUC-30). The results are as follows. The urban land area in China’s coastal zone increased from 16 600 km2 in 2000 to 48 000 km2 in 2020, with an expansion intensity of 9.41%. The regional cities in high-density expansion accounted for 41.03% and were mainly located in the north-central portion of the coastal zone. Cities in China’s coastal zone were expanding rapidly at a rate of 1 260.04 km2/a from 2000 to 2010 and 1 871.74 km2/a from 2010 to 2020. The urban impervious surface area had continued to increase over the past two decades. However, the proportion of the urban impervious surface decreased while that of urban green space increased. In 2000, the areas of urban impervious surface and urban green space in China’s coastal zone accounted for 69.49% and 20.81% of the urban land area, respectively. By 2020, they accounted for 63.70% and 26.72%, respectively. The urban expansion of 83.33% of the cities in China’s coastal zone was ahead of the urban population growth. The small cities have large GDP per urban land and high land use efficiency. The study can provide an important scientific basis and decision support for regional urban planning and sustainable development of China’s coastal zone.
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2022, Vol. 34 
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