Exploring the Variation Trend of Urban Expansion, Land Surface Temperature, and Ecological Quality and Their Interrelationships in Guangzhou, China, from 1987 to 2019
Exploring the Variation Trend of Urban Expansion, Land Surface Temperature, and Ecological Quality and Their Interrelationships in Guangzhou, China, from 1987 to 2019
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探索1987-2019年广州城市扩张、地表温度、生态质量变化趋势及其相互关系
DOI：
10.3390/rs13051019
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发表时间：
2021-03-01
期刊：
影响因子：
5
通讯作者：
Liu, Xulong
中科院分区：
文献类型：
--
作者：
Xu, Jianhui;Zhao, Yi;Liu, Xulong
探讨了城市不透水面密度、地表温度和综合生态评价指数的模型。利用1987 - 2019年广州市Landsat-5 TM（专题制图仪）、Landsat-8 OLI（业务陆地成像仪）和TIRS（热红外传感器）图像，分析了这些参数之间的相互关系。利用时间序列IS分数计算同心圆环内的城市IS密度，构建反S型城市IS密度函数，刻画城市形态变化和城市从中心向郊区扩展的时空动态。结果表明，过去32年广州经历了扩张性城市增长，城市空间结构模式从单中心结构转变为多中心结构。其次，计算了各同心环的归一化地表温度和地表环境指数，并分别用线性和非线性函数模拟了它们从市中心到郊区的变化趋势。结果表明，从市中心到郊区，归一化地表温度呈逐渐减小的趋势，而环境指数呈显著增加的趋势。在32年的城市快速发展过程中，城市中心区与郊区的标准化地表温度差随时间逐渐增大，CEEI显著减小。这表明快速城市化使广州市不透水面面积显著扩大，导致城市中心区与郊区地表温度差异增大，生态质量恶化。最后，城市IS密度，归一化LST，和CEEI之间的潜在相互关系也探讨了使用不同的模型。这项研究表明，快速城市化已经在几个国际空间站之间产生了地理趋同，这可能会增加城市热岛效应和生态质量退化的风险。
This study explored the model of urban impervious surface (IS) density, land surface temperature (LST), and comprehensive ecological evaluation index (CEEI) from urban centers to suburbs. The interrelationships between these parameters in Guangzhou from 1987 to 2019 were analyzed using time-series Landsat-5 TM (Thematic Mapper), Landsat-8 OLI (Operational Land Imager), and TIRS (Thermal Infrared Sensor) images. The urban IS densities were calculated in concentric rings using time-series IS fractions, which were used to construct an inverse S-shaped urban IS density function to depict changes in urban form and the spatio-temporal dynamics of urban expansion from the urban center to the suburbs. The results indicated that Guangzhou experienced expansive urban growth, with the patterns of urban spatial structure changing from a single-center to a multi-center structure over the past 32 years. Next, the normalized LST and CEEI in each concentric ring were calculated, and their variation trends from the urban center to the suburbs were modeled using linear and nonlinear functions, respectively. The results showed that the normalized LST had a gradual decreasing trend from the urban center to the suburbs, while the CEEI showed a significant increasing trend. During the 32-year rapid urban development, the normalized LST difference between the urban center and suburbs increased gradually with time, and the CEEI significantly decreased. This indicated that rapid urbanization significantly expanded the impervious surface areas in Guangzhou, leading to an increase in the LST difference between urban centers and suburbs and a deterioration in ecological quality. Finally, the potential interrelationships among urban IS density, normalized LST, and CEEI were also explored using different models. This study revealed that rapid urbanization has produced geographical convergence between several ISs, which may increase the risk of the urban heat island effect and degradation of ecological quality.