Journal
JOURNAL OF WATER AND CLIMATE CHANGE
Volume 13, Issue 10, Pages 3692-3715Publisher
IWA PUBLISHING
DOI: 10.2166/wcc.2022.224
Keywords
climate change; CMIP6; drainage system; statistical downscaling; urban flooding
Categories
Funding
- National Natural Science Foundation of China [52179027]
Ask authors/readers for more resources
Global climate change and rapid urbanization increase the risk of urban flooding, especially in China. This study used CMIP6 and SWMM models to quantify the impact of climate change on waterlogging in Beijing for the future 40 years. The results showed that climate change has a significant impact on waterlogging, and low impact development can effectively reduce overflow of the drainage system.
Global climate change and rapid urbanization increase the risk of urban flooding, especially in China. Climate change and the 'heat island effect' have increased the frequency of extreme precipitation. Affected by the backwardness of drainage facilities and the lack of drainage capacity, many cities have experienced large-scale waterlogging in low-lying areas, and ocean-like phenomena appear in cities. The public infrastructure was damaged and caused a lot of economic losses. Therefore, it is important to investigate the adaptability of drainage systems to the future in a changing environment. The Sixth International Coupled Model Intercomparison Project (CMIP6) and Storm Water Management Model (SWMM) were used to quantify the impact of climate change on Beijing's waterlogging under different rainstorm scenarios for the future 40 years. The quantile delta mapping method of daily precipitation based on frequency (DFQDM) is proposed to correct the daily precipitation of the climate model and which is proved to be feasible. After the annual precipitation and extreme precipitation index are corrected, percent bias (PBIAS) is significantly reduced. The PBIAS of the extreme precipitation index of the corrected model is all controlled within 6%. The corrected accuracy of CanESM5 is the best. The total flood volume (TFV) of the node increases with the aggravation of climate change. The TFV of SSP5-8.5 and SSP2-4.5 increased by 45.43 and 20.8% in the 100-year return period, respectively, and more than 94% of the conduits reached the maximum drainage capacity in different return periods. After the low impact development (LID) was installed, the improvement effect on the outflow with a smaller return period was significant, decreasing by about 50%. The LID can effectively reduce the overflow of the drainage system. The results of this study can provide suggestions for the reconstruction of the drainage system and the management of flood risk for Beijing in the future.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available