本研究以石羊河流域为研究区,选取2000、2006、2010年三期遥感影像为数据源,采用成本加权距离和城乡聚落体系潜能指数对传统的场强模型进行改进,综合利用扩张强度指数、扩张速度指数等分析研究石羊河流域内部城乡聚落体系空间结构分异。在此基础上,基于GIS技术并结合道路等级和长度计算流域内城乡聚落体系间最短时间距离来分析城乡聚落体系空间联系与空间相互作用,据此分析石羊河流域城乡聚落体系空间结构变化及影响模式。

Selecting three different remote sensing images(2000,2006 and 2010) as the data source, and cost weighted distance as well as urban-rural potential index are used to adjust and improve the field strength model. Besides, urban-rural expansion intensity index and urban-rural expansion speed index are also used to analyze urban and rural settlements spatial structure of Shiyang River Basin. The results show that: ① in the process of the urban-rural settlements spatial expand which dominated by central town, the small town is gathering and the large town is dispersing; ② the spatial structure of urban-rural settlements system show Jinchang, Wuwei as axis point, and Yongchang, GuLang, Minqin and Tianzhu as axis line; ③ the key contact among urban and rural settlements are transportation network, but inside of urban and rural settlements the administrative contact are much dominated; ④ as the core of urban settlement, the advantages of Liangzhou District and Jinchuan District are obvious in comparison with other settlement systems. Spatial reciprocity intensity between systems of Wuwei is slightly higher than that of Jinchang and Sunan and significantly higher than other settlements. Liangzhou and Jinchuan play a more important role in the urban agglomeration.The spatial connection direction appears in a circle shape around Liangzhou and Jinchuan along the traffic corridor in an axis including Lan-Xin railway and Lian-Huo highway from south to north.