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  Time series analysis of floods across the Niger River basin

Aich, V., Koné, B., Hattermann, F. F., Paton, E. N. (2016): Time series analysis of floods across the Niger River basin. - Water, 8, 4, 165.
https://doi.org/10.3390/w8040165

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Aich, Valentin1, Author              
Koné, B.2, Author
Hattermann, Fred Fokko1, Author              
Paton, E. N.2, Author
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1Potsdam Institute for Climate Impact Research, ou_persistent13              
2External Organizations, ou_persistent22              

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 Abstract: This study analyses the increasing number of catastrophic floods in the Niger River Basin, focusing on the relation between long term hydro-climatic variability and flood risk over the last 40 to 100 years. Time series for three subregions (Guinean, Sahelian, Benue) show a general consistency between the annual maximum discharge (AMAX) and climatic decadal patterns in West Africa regarding both trends and major changepoints. Variance analysis reveals rather stable AMAX distributions except for the Sahelian region, implying that the changes in flood behavior differ within the basin and affect mostly the dry Sahelian region. The timing of the floods within the year has changed only downstream of the Inner Niger Delta due to retention processes. The results of the hydro-climatic analysis generally correspond to the presented damage statistics on people affected by catastrophic floods. The damage statistics shows positive trends for the entire basin since the beginning in the 1980s, with the most extreme increase in the Middle Niger.

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 Dates: 2016
 Publication Status: Finally published
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 Identifiers: DOI: 10.3390/w8040165
PIKDOMAIN: Climate Impacts & Vulnerabilities - Research Domain II
eDoc: 7185
Working Group: Hydroclimatic Risks
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Title: Water
Source Genre: Journal, SCI, Scopus, p3, oa
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Pages: - Volume / Issue: 8 (4) Sequence Number: 165 Start / End Page: - Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/140903