酒泉市1990—2016年城市空间形态及驱动力分析

城市空间形态体现城市空间扩展过程,对城市可持续发展战略的制定具有重要的参考价值。利用遥感影像从城市空间扩展和城市外部形态的时空特征两方面,借助GIS和RS技术定量化分析酒泉城市空间形态演化规律,利用灰色关联方法对酒泉城市空间扩展驱动力进行探究。结果表明：城市空间扩展呈现整合式外延快速扩张过程,用地扩展和速度差异较大,用地扩展方向指向性明显；城市外部形态呈现不稳定的分散发展状态,重心转移向西南和西方向。城市建设用地空间扩展的主要驱动力为经济发展和建设投资。

Analysis of urban spatial morphology and driving force in Jiuquan from 1990 to 2016

Urban morphology reflects the process of urban spatial expansion, which has important reference value for the formulation of urban sustainable development strategy. From the two aspects of space-time characteristics of urban spatial expansion and external form, the paper uses remote sensing image and GIS and RS technology to quantitatively analyze the evolution law of urban spatial morphology in Jiuquan, and uses the gray correlation method to explore the driving force of urban spatial expansion in Jiuquan. The results show that: The urban spatial expansion shows the process of integrated extension and rapid expansion. There is a big difference between land expansion and speed, and the direction of land expansion is obvious. The external form of the city presents an unstable and decentralized state of development, and the center of gravity shifts to the southwest and west. The main driving force of urban construction land spatial expansion is economic development and construction investment.