粤港澳大湾区建成区扩张时空特征分析

本文首先基于1992-2019年的夜间灯光数据(DMSP-OLS、NPP-VIIRS),参考粤港澳大湾区建成区面积数据,对比确定灯光阈值,提取出大湾区建成区边界;然后从扩张模式、扩张速度、扩张程度3个方面定量分析了大湾区建成区扩展时空特征;最后结合景观生态学方法分析了大湾区建成区扩展的时空格局特征。研究表明:①粤港澳大湾区城市群重心1992年位于东莞市内,2019年迁移至广州市,形成了以广州市为中心的珠三角地区发展核心区域;②整区扩展区域一体化,蔓延速度有所下降,蔓延程度增强,珠三角地区向周围城市的辐射能力不断增强;③城市扩展主要以珠三角地区为中心沿交通线呈倒"V"发展。

Study on the spatial and temporal characteristics of the expansion of the built-up area in Guangdong-Hong Kong-Macao Greater Bay Area

Based on the nighttime light data (DMSP/OLS,NPP/VIIRS) from 1992 to 2019,this paper refers to the built-up area data of the Guangdong-Hong Kong-Macao Greater Bay Area and compares the light threshold,and finally obtains the built-up area boundary of the Greater Bay Area.It makes a quantitative analysis of the spatiotemporal characteristics of the expansion of the built-up area of the Greater Bay Area from three aspects:expansion mode,expansion speed and expansion degree.At the same time,the spatial and temporal pattern characteristics of the expansion of the built-up area in the Greater Bay Area are also analyzed with the method of landscape ecology.The results show that:① The center of gravity of the Guangdong-Hong Kong-Macao Greater Bay Area urban agglomeration was located in Dongguan in 1992,and moved to Guangzhou in 2019,forming the development core area of the pearl river delta region with Guangzhou as the center.②The expansion of the whole region presents a trend of regional integration,with the speed of spread decreasing and the degree of spread increasing,and the radiation capacity of the Pearl River Delta region to the surrounding cities increasing.③The urban expansion mainly centers on the Pearl River Delta region and develops in an inverted "V" shape along the transportation lines.