IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Extreme events, natural variability and climate change : Use of climate indexes as covariates in modelling high discharges under nonstationary condition in o...
Use of climate indexes as covariates in modelling high discharges under nonstationary condition in oueme river
Author : Jean Hounkp¨¨ (1, 2), Abel A. Afouda(2), Bernd Diekkr¨¹ger(3)
ABSTRACT
Within the context of climate change, the hypothesis of the stationarity of observed datasets for performing classical flood frequency analysis is no longer valid. We explore the use of see surface temperature (SST) and see level pressure (SLP) as covariates for modelling the annual maximal discharges (AM) at 5 gauging station of the Ou¨¦m¨¦ basin. Significant correlations (at 5% level) were found between the AM and the SST/SLP of the Gulf of Guinea. Non-stationarity was introduced to the generalized extreme value (GEV) distribution using a linear function of the location and scale parameters. Different combinations of the model parameters were explored with the stationary model based on three criteria of goodness of fit. The non-stationary model superior to others and explains a substantial amount of variation in the data. The good correlations found provide a possibility of using these climate indexes as predictors for flood early warning system implementation
File Size : 430,494 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Extreme events, natural variability and climate change
Date Published : 27/08/2015
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