Urban sprawl and thermal response in the Guangdong-Hong Kong-Macao Greater Bay Area, 2000–2020

IF 2.5 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Hao Yuan, Yonglin Chen, Yunping Zhang, Lei Ming, Yuntao Xie
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Abstract

The urban heat island (UHI) environment is closely related to the daily life of residents, and the impact of UHI is further expanding in the era of rapid urbanization, which is particularly obvious in the Beijing-Tianjin-Hebei urban agglomeration and Guangdong-Hong Kong-Macao Greater Bay Area (GBA). To explore the connection between UHI and urban expansion, this study takes GBA as the study area, based on Google Earth Engine platform and Landsat satellite data. The urban-rural temperature difference method was used to analyze the heat island zoning in the GBA from 2000 to 2020, and the direction and type of urban expansion in the GBA were investigated by standard deviation ellipse and LEI, to explore the link between the type of urban expansion and the heat island region through geospatial analysis methods. The results of the study show that: (1) The proportion of the area of strong and extreme heat islands in the GBA was 37.64% in 2000; 38.61% in 2005; 47.07% in 2010; 55.76% in 2015; and finally 59.69% in 2020. The proportion of the area of heat island regions in the period from 2000 to 2020 showed an overall increasing trend, with the largest increase in heat island regions in the period from 2015 to 2020. (2) The intensity of urban expansion in the GBA is 32% in both 2000–2005 and 2005–2010, which is significantly higher than the 9% in 2010–2015, and then increases to 24 per cent in 2015–2020. The speed of movement of urban centroids decreases in 2000–2015 and increases in 2015–2020. The direction of urban expansion in the first 5 years is dominated by the northeast, and the direction of urban expansion in the latter 15 years is generally dominated by the southwest, and the type of urban expansion is dominated by the fringe type, with the enclave type of expansion accounting for a smaller proportion. (3) Pearson correlation analysis further confirms that there is a significant positive correlation between urban sprawl and the urban heat island effect, with a correlation coefficient of 0.78 and a p-value of 0.041. There is a high degree of spatial consistency between the distribution of built-up urban areas and the distribution of heat island areas in GBA, and the direction of the evolution of the urban heat island areas is the same as the direction of the evolution of the built-up urban areas in general, and the thermal response of the marginal expansion to the ground surface temperature is stronger than that of enclave expansion. The thermal response to the surface temperature is stronger than that of the enclave type of expansion.
2000-2020 年粤港澳大湾区的城市扩张与热响应
城市热岛(UHI)环境与居民的日常生活息息相关,在快速城市化的时代,UHI 的影响进一步扩大,这在京津冀城市群和粤港澳大湾区(GBA)尤为明显。为探讨 UHI 与城市扩张之间的联系,本研究以粤港澳大湾区为研究区域,基于谷歌地球引擎平台和 Landsat 卫星数据。采用城乡温差法分析大湾区 2000 年至 2020 年的热岛分区,利用标准偏差椭圆和 LEI 研究大湾区城市扩张的方向和类型,通过地理空间分析方法探讨城市扩张类型与热岛区域之间的联系。研究结果表明(1)强热岛和极端热岛面积占 GBA 面积的比例在 2000 年为 37.64%,2005 年为 38.61%,2010 年为 47.07%,2015 年为 55.76%,2020 年为 59.69%。从 2000 年到 2020 年,热岛地区面积比例总体呈上升趋势,其中 2015 年到 2020 年热岛地区面积比例上升幅度最大。(2)2000-2005年和2005-2010年,GBA城市扩张强度均为32%,明显高于2010-2015年的9%,2015-2020年又增加到24%。城市中心的移动速度在 2000-2015 年下降,在 2015-2020 年上升。前 5 年城市扩张方向以东北部为主,后 15 年城市扩张方向总体以西南部为主,城市扩张类型以边缘型为主,飞地型扩张占比较小。(3)皮尔逊相关分析进一步证实,城市扩张与城市热岛效应之间存在显著的正相关关系,相关系数为 0.78,P 值为 0.041。在 GBA 中,城市建成区的分布与热岛区的分布在空间上具有高度的一致性,城市热岛区的演变方向与城市建成区的演变方向总体上是一致的,边缘扩张对地表温度的热响应强于飞地扩张。地表温度的热响应强于飞地式扩张。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Environmental Research Communications
Environmental Research Communications ENVIRONMENTAL SCIENCES-
CiteScore
3.50
自引率
0.00%
发文量
136
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