| In the past century, China underwent the urbanization process that has taken western countries for two or three decades, which has caught the attention worldwide. The rapid urbanization process provides unique opportunity and motivation to consuming and investigation demands, meanwhile, it also offers unspeakable challenge to energy saving, environment improvement as well as development quality security. Therefore, during the transformation period of regional coordination and coordinating urban and rural development, the coordination between increasingly strong development demands and never ever more intense environment resource constrain has become the heat topic in the "twelfth five-year-plan outline"From international experience, a well-established UGB as a urban spatial growth management policy tool, is playing an active role in soothing the confliction between the resource constrain and economic development demand. At macro-policy level in China, the ever growing demand of land conservation, compact development, and low-carbon urban space management is guiding growth management into the direction of, more limitations and constraints on urban space urban spatial expansion strengthen. Meanwhile, the red line for cultivated land protection also proposed restrictions and constraints on both the quantity and layout of further urban sprawl. However, the present values and technical approach of urban planning pay more attention to the aspect of social and economic development needs while the scarcity of land resources which is a very important factor is neglected. The reality also suggests that the urban spatial growth management and planning is always controlled by the actual pace of project inputs and investment. Therefore, it has become a great challenge for sustainable urban development to establish a scientific urban growth boundary on the basis of coordinating resource protection and economic developmentThis paper is a logical system containing three parts:the first part is research basis containing establishing the research idea and framework of the paper. Through review and evaluate the current UGB research and GIA system building and application situation both in China and aboard, the approach of combining UGB establishment and GIA is proposed, so as to achieve the goal to maintain the urban sprawl within the most suitable development area and converse the traditional passive resource conservation into an active defensive method. The second sector is about research content. The "cross frame" is established on the basis UGB and GIA, the intersection point of which is the entry point of potential land supply area for urban construction. Integrated by GIS spatial analysis, land transfer matrix analysis of landscape pattern index, GI identification and evaluation of spatial elements, CA Space Simulation and other methods the UGB spatial model is built. The core idea is that the development of urban growth boundaries must comply with land supply constraints and resource protection under the coordination of land development framework, and reflect land coupling relationship between the use and land characteristics. The third part is a case study of Hangzhou in Yangtze River Delta region. The suitability of the urban growth boundary spatial model is studied through analyzing changing periodic characteristic of Hangzhou spatial expansion, land use/cover and landscape pattern. The potential quantity and spatial layout of urban land supply as well as GI net whose ecological value is the highest within the region can be identified through GI element identification and evaluation. Such potential land supply mentioned is set as the macro constrain condition, and combining it with other constraints like regional parameters and neighbor parameters, Hangzhou’s 2020 urban sprawl situation can be simulated utilizing GIA-CA model and based on the result the UGB can be developed. This scientifically established UGB can be used as a useful reference for urban planning approach of current urban spatial management under the smart growth model. |
