海绵城市理念下山地城市蓝绿格局优化研究——以远安县中心城区为例

Optimization of Blue-Green Pattern in Mountainous Cities Under Sponge City Concept—A Case Study of Yuan'an County

蓝绿设施建设是“海绵城市”建设的重要部分,以远安县中心城区为研究对象,“以水定绿”为规划方法,因地制宜地提升新老城区蓝绿服务功能,对未来海绵城市建设具有重要意义。根据城市降雨、地形、土地类型现状等构建远安县SCS雨洪淹没模型,结合城市绿地斑块、绿地点、路网等,分析了城区景观格局和绿地可达性,结果表明:(1)远安县被淹没区域多集中在水系附近及地形坡度平缓的区域;(2)老城区蓝绿建设较新城区更为合理,新城区蓝绿设施连接度还需加强;(3)老城区出行优势明显,游憩绿地空间上分布不均。并提出了研究对象蓝绿空间优化策略:完善滨河绿带,构建三重防洪体系;加强城市边缘地带的生态网络建设;提高老城区绿量。以科学、生态的蓝绿格局优化方法,实现可持续发展,并为其他山地县提供借鉴和指导。

The construction of blue-green infrastructure is an important part of"sponge city"construction.Taking the central urban area of Yuan'an County as the research object and"water-oriented green"as the planning method,it is of great significance to improve the blue-green service function of the new and old urban areas in a targeted manner for the future sponge city construction.Based on the current situation of urban rainfall,topography,and land types,a SCS flood submergence model for Yuan'an County was constructed.Combined with urban green space patches,green space points,road networks,etc.,the landscape pattern and green space accessibility of the urban area were analyzed.The results show that:①The submerged areas of Yuan'an County are mostly concentrated near the water system and in areas with gentle slopes;②The blue-green construction in the old urban area is more reasonable than that in the new urban area,and the connectivity of blue-green facilities in the new urban area needs to be strengthened;③The old urban area has obvious advantages in travel,and the distribution of recreation green space is uneven.Based on this,this paper puts forward optimization strategies for blue-green space in the research area:improving the riverfront green belt and constructing a triple flood control system;strengthening the construction of ecological networks in the urban edge zone;increasing the green space in the old urban area.With scientific and ecological optimization methods for blue-green pattern,it can achieve sustainable development and provide a reference and guidance for other mountainous counties.