China’s growing human displacement risk caused by floods under 1.5 °C and 2.0 °C global warming and beyond

Qi，Wei1; Feng，Lian1; Liu，Junguo1; Zhu，Xueping2; Liu，Yanli3; Kuang，Xingxing1; Xie，Zhigao4

2023-12-01

10.1088/1748-9326/ad0a1d

Environmental Research Letters   影响因子和分区

1748-9326

Human displacement is one of the most pressing global issues, and China has the world’s largest population affected by floods. Yet, the spatial and temporal variations of China’s Human Displacement Risk (HDR) caused by floods remain unclear. Here, we investigated China’s HDR caused by extreme floods under different global warming levels, including 1.5 °C, 2.0 °C and beyond. We developed an approach to estimate human displacement caused by floods in China. Based on this method, our findings indicate that China’s HDR will increase by ∼10.7 (∼11.0) times under 1.5 °C (2.0 °C) warming, and each 0.5 °C warming will increase HDR by 3 million on average. These great increases are mainly driven by climate change rather than population variations. Our results also reveal that the relationship between human displacement and increasing percentage of flood protection levels follows an exponential function. Additionally, we found that increasing China’s current flood protection standard by ∼46% (1.5 °C and 2.0 °C) and ∼59% (4.5 °C) would reduce future HDR to the historical period level. This study provides valuable insights into China’s HDR, which can aid in adaptive flood risk management amid the trend of shifting to a warmer and more extreme climate.

climate change flood human displacement

SCI ; EI

英语

第一 ; 通讯

WOS:001103463500001

20234915151747

Exponential functions ; Flood control ; Global warming ; Risk management

Flood Control:442.1 ; Atmospheric Properties:443.1 ; Accidents and Accident Prevention:914.1 ; Mathematics:921

2-s2.0-85178135371

Scopus

1.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.College of Water Resource Science and Engineering,Taiyuan University of Technology,Taiyuan,030024,China
3.Nanjing Hydraulic Research Institute,State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing,210098,China
4.East Water Authority of Shenzhen Municipality,Shenzhen,518055,China

Qi，Wei,Feng，Lian,Liu，Junguo,等. China’s growing human displacement risk caused by floods under 1.5 °C and 2.0 °C global warming and beyond[J]. Environmental Research Letters,2023,18(12).

Qi，Wei.,Feng，Lian.,Liu，Junguo.,Zhu，Xueping.,Liu，Yanli.,...&Xie，Zhigao.(2023).China’s growing human displacement risk caused by floods under 1.5 °C and 2.0 °C global warming and beyond.Environmental Research Letters,18(12).

Qi，Wei,et al."China’s growing human displacement risk caused by floods under 1.5 °C and 2.0 °C global warming and beyond".Environmental Research Letters 18.12(2023).