居民活动空间与生态约束协调的城市开发边界划定方法——以长沙市为例

Study on the Delineation Method of Urban Growth Boundary under the Coordination of Residential Activity Space and Ecological Constraint:A Case Study of Changsha,China

为了遏制长沙市城市的无序扩张,促进土地节约集约、高效利用,保障生态空间质量,划定长沙市城市开发边界成为重要举措。基于居民活动空间扩展,选取人口密度、居民活动分布、基础设施布局等多源时空数据,通过量化居民活动空间扩展概率,并利用植被覆盖度构建生态约束强度,确定二者协调规则,作为CA模型的约束条件,进行城市建设用地模拟,划定城市开发边界。结果表明:划定的长沙市城市开发边界,结果与长沙市"十三五"规划的城市空间发展框架基本一致,对未来建设用地扩展方向预测合理,而且避免了侵占重要生态资源,达到了兼顾城市空间发展和生态资源保护的多重目的。

Urban Growth Boundary (UGB)is an effective tool to control urban sprawl,and protect ecological space.The study selected 11factors such as population density,residents'activity distribution and infrastructure layout,to quantify the expansion potential of residential activity space.Constructing ecological constraint based on vegetation coverage,and develop coordination rules.Combine both as CA model constraints to simulate urban construction,then delineate urban growth boundary.The resuhs show that the delineation of urban growth boundary is consistent with the framework of urban spatial development in Changsha's "13th Five- Year Plan".Moreover,the delineated boundary avoids occupying important ecological resource and guides the city to expand in suitable area.Generally,the goal to balance the urban development and ecological protection is achieved.