- The Models of Urbanization and Their Impacts on Spatial Evolution of Built-up Areas——Case Studies of Cities in Shaanxi in Northwest China   502 kb by    Chen, Xiaojian & Li, X & Ding, N | 353059872@qq.com    Short Outline Large-scale demographic changes driven by migration have different effects on the spatial evolution of cities with different scales and different development conditions. This paper discusses the effectiveness and lessons derived from the implementation of city planning in these three units and takes Xi’an, Yulin and Ankang separately as examples. Abstract Large-scale demographic changes driven by migration are already a fundamental force in urbanization and have different affect on spatial evolution of cities with different scales and different development condition. In Shaanxi, the gap between the household registration population and permanent residents increase gradually. Furthermore, it results in different effectiveness of planning practices, especially, to spatial development and layout because of the uncertainty in population. The paper describes the drivers of regional development，spatial evolutional course of the built-up areas of the dominant cities, planning practice and their effectiveness etc.. The specific focus is on the relationship between population migration features and spatial evolution of built-up areas by the compared analysis of cities with different scales and different drivers. The results demonstrate that the central Shaanxi has been experiencing the increase of permanent residents. Especially, the mega city-Xi’an- has been experiencing a large number of permanent residents increase from every municipal regions throughout Shaanxi and other regions in Northeast China over the past several decades. For Northern and Southern Shaanxi, the population migration has complex characteristics. Different migration models make different urbanization models as well as different growth and spatial evolution characters of built-up areas of dominant cities. Furthermore, it results in different effectiveness of planning practices. Keywords urbanization spatial evolution Case Study presented on the ISOCARP Congress 2013: Frontiers of Planning - Evolving and declining models of city planning practice   Click to open the full paper as pdf document   Click to send an email to the author(s) of this paper