老城区海绵城市改造措施对比研究——以赣州市河套区为例

A contrastive study of sponge city renovation measures in old city——taking the Hetao area of Ganzhou city as an example

利用ENV I和GIS技术提取赣州市河套老城区土地利用数据,通过分析赣州市河套老城区水文格局进行集水区分析,以代表性集水区为例进行SWMM模拟,在相同降雨事件不同比例LID设施情况下,发现河套老城区LID设施改造比例为60%时设施改造量和雨水消纳量之间的效益比最佳。在不同降雨事件相同比例LID设施情况下,生态滞留池设施雨水消纳能力为绿屋顶的3~4倍。老旧城区在海绵城市改造上,应以生态滞留池为主、绿屋顶为辅。

The technologies of ENVI and GIS were used to extract the land use information of the Hetao old city in Ganzhou. Through analyzing the hydrological pattern in old city, the water consumption of bio-retention pond and green roof was discussed by SWMM model. We found that reforming 60% of LID facilities got the best benefit ratio to gain the water consumption at the same rainfall events with different proportions of LID facilities. Bio-retention ponds＇ water consumption capacity was 3 to 4 times as large as the green roof in different rainfall events in the same proportion of LID facilities. The bio-retention pond was the priority selection than green roof in sponge cities renovation in old cities.