气候变化领域集成服务门户(CCPortal): Observed changes in flood hazard in Africa

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DOI	10.1088/1748-9326/abb90b
	Observed changes in flood hazard in Africa
	Tramblay Y.; Villarini G.; Zhang W.
发表日期	2020
ISSN	17489318
卷号	15 期号:10
英文摘要	Floods represent a major natural hazard in Africa, causing over 27 000 fatalities during the period 1950-2019. Despite its relevance, little is known about changes in flood hazard across this continent due to the lack of long-term high-quality streamflow records. Here we use a newly assembled discharge dataset of African rivers, and provide a long-term comprehensive view of flood hazard across this continent. We show that the annual maximum peak discharge does not exhibit a monotonic pattern, but overall decreasing trends prior to 1980 and increasing trends afterwards, especially in western and southern Africa. Our results indicate that these differing trends can be ascribed to changes in extreme precipitation around 1980. Moreover, these changes in intense precipitation pre/post 1980 are due to increased thunderstorm activity associated with enhanced convective available potential energy and zonal vertical shear driven by cooling temperature trends over western Africa. The changes in flood hazard in southern Africa can be tied to changes in Namibia low-level jet. Therefore, the observed increase in flooding since 1980 suggests that it would be beneficial to improve the monitoring, modeling and communication of flood hazard to reduce the socio-economic impacts of these events. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	Africa; extreme precipitation; Floods; trends
语种	英语
scopus关键词	Hazards; Potential energy; Precipitation (meteorology); Convective available potential energies; Cooling temperature; Extreme precipitation; Intense precipitation; Peak discharge; Socio-economic impacts; Streamflow records; Thunderstorm activity; Floods; flood; flood basalt; flooding; hazard assessment; natural hazard; peak discharge; potential energy; socioeconomic conditions; streamflow; thunderstorm; Namibia
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153569
作者单位	HydroSciences Montpellier (Univ. Montpellier, CNRS, IRD), avenue du Professeur Emile Jeanbrau 300, Montpellier, 34090, France; Iihr - Hydroscience and Engineering, University of Iowa, Iowa City, IA, United States
推荐引用方式 GB/T 7714	Tramblay Y.,Villarini G.,Zhang W.. Observed changes in flood hazard in Africa[J],2020,15(10).
APA	Tramblay Y.,Villarini G.,&Zhang W..(2020).Observed changes in flood hazard in Africa.Environmental Research Letters,15(10).
MLA	Tramblay Y.,et al."Observed changes in flood hazard in Africa".Environmental Research Letters 15.10(2020).