成都市建成区形态动态演变及驱动机制研究

城市形态反映城市功能结构特征,对研究城市演变具有重要作用。通过1978、1988、1997和2009年的四期遥感图像,解译成都市主城区和邻近郊县的边界,求取长轴、短轴、周长、面积、延伸率、形状比和紧凑度等指标。结果表明:1978～2009年,城区面积年均增长7.49%;长轴的主体方位为东北—西南方向,短轴的主体方向为近东西向;城区重心围绕天府广场运动,表现出向西南方向转移的趋势;城区延伸率先降后升,形状比先升后降,紧凑度持续升高,城市发展由量变转向质变。城市形态受到自然和政治经济文化等多种要素的综合驱动,由圆形扩张转变为点轴发展模式,主城区与周边区县实现了空间融合。

Study on Dynamic Evolution and Driving Mechanism of Built-up Area in Chengdu

Urban morphology reflects the structure of urban functions,and it is important to study on urban morphological evolution.Four remote sensing images of 1978,1988,1997 and 2009 were collected,and the boundary of central city and adjacent suburbs of Chengdu was interpreted,then long axis,short axis,perimeter,area,elongation,shape ratio and compactness were calculated from the boundary.The results showed that during 1978-2009,the average annual growth of urban areas was 7.49%;the main direction of long axis was the northeast-southwest,and the main direction of short axis was west-east;urban center moved around the Tianfu Square,and shift gradually towards the southwest;urban elongation changed first decreased and then increased,shape ratio changed first increased and then decreased,compactness Increased continuously,and the urban developed from quantitative to qualitative.Urban morphology was influenced by natural,political,economic and cultural factors,the morphology shifted from round expansion to point-axis expansion,and center city district and surrounding counties achieved a spatial integration.