Authors:
Qian Yu
1
;
2
;
Xiaohe Du
1
;
2
;
Na Li
1
;
2
;
Yuting Meng
3
and
Jing Wang
1
;
2
Affiliations:
1
Research Center on Flood & Drought Disaster Reduction of the Ministry of Water Resources, Beijing, 100038, China
;
2
China Institute of Water Resources and Hydropower Research, Beijing, 100038, China
;
3
PowerChina Zhongnan Engineering Corporation Limited, Changsha, 410014, China
Keyword(s):
Green Infrastructures, Water Quantity Control, Rainfall Characteristics, Pluvial Flooding.
Abstract:
Under the dual impacts of climate change and rapid urbanization, urban pluvial flooding disasters in China are increasingly serious, which cause huge economic losses and even serious casualties. Green infrastructure (GI), a kind of resilient measure, can control rainfall runoffs and improve water quality. Modelling the effects of GIs on controlling stormwater runoff under different rainfall characteristics plays an important role in planning and designing GIs that are adapted to both local conditions and future climate change. In this paper, we set nine rainfall scenarios with varying rainfall characteristics (intensity-duration-frequency, IDF) and then study the effects of the combined GIs on water quantity in the Jinan pilot area. The results show that GIs have good control effects on the inundation areas and runoff coefficients under rainfalls with small return periods. With the increases in return periods and rainfall intensities, the control effects of GIs on inundation areas de
crease significantly. However, with the increases in rainfall intensities, the control effects on runoff coefficients are not that obvious. In addition, rainfall duration variations have little impact on reducing rates of controlling inundation areas and runoff coefficients.
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