Optimization of Blue-Green Pattern in Mountainous Cities Under Sponge City Concept——A Case Study of Yuan'an County
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:① The 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.
blue-green infrastructuresponge citymountainous citySCS modelYuan'an County
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