高质量发展背景下城市空间增长模式转变的时空监测——以太原市为例

Spatiotemporal monitoring of urban spatial growth pattern transitions in context of high-quality development:A case study of Taiyuan City

增量扩张与存量更新是城市空间增长的两种方式,在高质量发展背景下监测增量扩张与存量更新的相互变化,分析其演变特征,可为城市制定合理的空间增长策略提供依据,对提高城市土地利用效率、促进城市高质量发展有重要意义。文中基于GEE云平台,提出一种城市增量扩张向存量更新转变的精确监测方法,以太原市为例开展实证研究,考察城市增量扩张与存量更新的变化特征与相互关系,主要研究结果:1)文中提出基于光谱指数与夜间灯光亮度识别建成区,以防尘网、裸地和建筑垃圾为典型标志地物提取存量更新地块的监测方法,能相对准确地识别城市增量扩张与存量更新的空间大小。2)2015-2021年太原市增量扩张的面积为73.78km^(2),存量更新面积为12.97km^(2),分别占研究区总面积的5.21%和0.92%,从时间变化趋势来看,存量更新占比逐渐增高。3)太原市存量更新地块的数量逐年增长,而平均面积不断减小,太原市存量更新正由成片拆建转向精细化调整。文中拓展了基于增量扩张与存量更新联动考察城市空间增长的新视角和监测方法,具有重要的学术与现实意义。

Incremental expansion and stock renewal are the two ways of urban spatial growth.In the context of high-quality development,monitoring the mutual changes between these two processes and analyzing their evolutionary characteristics can provide a basis for cities to formulate reasonable spatial growth strategies.It is of great significance to improve the urban land use efficiency and promote high-quality urban development.In this paper,an accurate monitoring method is proposed for the transition from urban incremental expansion to stock renewal based on the GEE cloud platform,and the Taiyuan City is employed as a case to empirically examine the changing characteristics and interrelationships between urban incremental expansion and stock renewal.The main research findings are as follows:1) The study introduces a method for detecting built-up areas through spectral indices and nighttime light brightness recognition,employing prominent markers like dust nets,bare land,and construction waste to extract stock renewal plots.This approach enables a relatively precise determination of the spatial dimensions of urban incremental expansion and stock renewal.2) The incremental expansion area in Taiyuan City from 2015 to 2021 was 73.78km~2,and the stock renewal area was 12.97km~2,accounting for 5.21% and 0.92% of the total area of the study area,respectively.In terms of the trend of time changes,the proportion of stock renewal was gradually increasing.3) The number of stock renewal plots in Taiyuan City had been increasing year by year,while the average area was continuously decreasing.This indicates that the stock renewal in Taiyuan City is shifting from extensive demolition and construction to refined adjustment.The paper expands a new perspective and monitoring method for examining urban spatial growth based on the linkage between incremental expansion and stock renewal,which has important academic and practical significance.