Author(s): Chenyao Xiang, Jiahong Liu, Weiwei Shao, Jinjun Zhou, Chao Mei, Lin Xia
Linked Author(s): Jiahong Liu
Keywords: Green Infrastructures (GIs), sponge city, urbanization, flood mitigation, Xiamen City
Abstract: Rapid urbanization and climate change have resulted in increasing risks of urban flooding, and promoting green infrastructures (GI) in urban areas is one of the main methods to minimize negative urbanization effects on water systems. Chinese government have launched the project of Sponge City Construction in 2015 and since then China has rapidly implemented comprehensive networks of GIs on city scale in approximately 30 demonstration cities. More than simply installing GIs, sponge city design integrated different GIs vertically, to achieve a stairway absorption, further reducing urban flood risk. This paper conducted a scenario study based on a residential area (6. 2 ha) in Xiamen, which is currently equipped with green roofs of 1401 m2, bio-retention of 5325 m2, vegetative swales of 1880 m2, and rain barrels of 15 m3 in total. The result shows that the GI system has obvious sliced surface runoff and peak flow in small rains, but the effect tends to weaken in larger rains. However, the combination of several different GIs showed notable superiority in not only controlling runoff volume and peak flow, but also in the resilience to variation of precipitation
Year: 2017