紧凑发展理念下山西省河曲县城市空间增长边界划定研究

Study on Boundary Delimitation of Urban Spatial Growth inHequ City under the Concept of Compact Development

城市空间增长边界的划定对于缓解城市的无序扩张和实现城市健康稳定发展必不可少。以紧凑发展理念为指导,以水土流失严重、生态本底脆弱的河曲为研究对象,从城市的生态约束与扩展需求之间的矛盾出发,探索了河曲的紧凑增长边界。首先,通过引入生态适宜性评价模型构建河曲的综合生态安全格局,确定城市的“刚性”边界;其次,利用最小累计阻力模型模拟较为适宜城市增长的“弹性”范围;最后,将两个边界进行叠加拟合,并用分形维数对各边界紧凑度进行比较,择优选出最为紧凑的城市空间增长边界,以控制城市空间蔓延,提高土地集约利用水平,维护生态本底安全,引导河曲未来健康稳定发展。

The delimitation of urban spatial growth boundary is essential to alleviate the disorder expansion of cities and realize the healthy and stable development of cities.Under the guidance of the concept of compact development,this paper takes Hequ County,which has serious soil erosion and fragile ecological background,as the research object.Starting from the contradiction between urban ecological constraints and expansion demand,the author explores the compact growth boundary of Hequ County.Firstly,the comprehensive ecological security pattern of Hequ County is constructed by introducing the ecological suitability evaluation model to determine the“rigid”boundary of the city;secondly,the least cumulative resistance model is used to simulate the more suitable“elastic”range of urban expansion;finally,the two boundaries are superimposed and fitted,and the compactness of each boundary is compared with fractal dimension,and the most compact one is selected in order to control the urban spatial spread,improve the level of intensive land use,maintain the ecological background security,and guide the healthy and stable development of Hequ in the future.