摘要
以1995年TM、2000年和2008年ETM+影像为数据源,提取了3个时期的西安市主城区建设用地及扩张信息,运用扩展强度指数、城市形态分形维数和扩张弹性系数模型对西安市1995～2008年建成区的扩张状况进行了分析并对其扩张的动力机制进行了研究。结果表明:1)研究区的建设用地面积从1995年的183.44km2增加到2008年的367.37km2,总体扩张了2倍多,年增长率为5.48%。2)城区的扩张围绕中心三城区(新城区、莲湖区、碑林区)向周围城郊扩张,扩张主要集中在北郊的未央区和南郊的雁塔区以及东部的灞桥区,西部区域扩张不显著。3)各指数表明城区总体扩张较快,城市边缘趋于复杂化,而且扩张不尽合理。在对其扩张动力机制分析表明,社会经济的发展是建成区扩张的内力,人口的增长和投资的加大及合理分配起着促进作用,交通网络的发展也起到了一定的推动作用。
In this paper, urban land area in Xi＇an were extracted and its expansion information were obtainedbased on the Landsat TM/ETM ＋ images which obtained in 1995,2000 and 2005 ;Then urban land area＇s expansion and its expansion＇s driving mechanism were analyzed using expansion intensity index, urban morphology fractal force and expansion elasticity coefficient model. The results indicated that： 1 ）Urban land area increasedfrom 183.44km^-2 to 367.37km^-2 during 1995 - 2008, and overall expanded for 2 times and annual expansion ratewas 5.48%. 2）The expansion trend was from center areas （Xincheng district, Lianhu district, Beilin district）to periphery suburb, the expansion mainly concentrated in northern suburbs - Weiyang district and southern sub- urbs - Yanta district and eastern suburbs - Baqiao district, the expansion in western was not significant. 3 ） Eachindex showed that urban overall expansion was faster and urban fringe tends became complicated and expansion was not rational. Furthermore, analyzing urban land~ expansion situation and its mechanism showed that the eco-nomic development was endogenic force, and population growth, investment enlargement, rational allocation and development of transport network promoted the expansion of urban land.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2012年第4期37-43,共7页
Journal of Arid Land Resources and Environment
基金
陕西师范大学中央高校基本科研业务费专项资金(GK200902021)
陕西师范大学优秀科技预研项目(200902005)
旅游与环境学院青年科研基金项目资助
关键词
RS技术
建成区扩张
动力机制
西安市
RS technology
urban land expansion
dynamic mechanism
Xi＇an RS technology
urban land expansion
dynamic mechanism
Xihn
