Reference : Return Period of Characteristic Discharges From the Comparison Between Partial Durati...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/246033
Return Period of Characteristic Discharges From the Comparison Between Partial Duration and Annual Series, Application to the Walloon Rivers (Belgium)
English
Van Campenhout, Jean mailto [Université de Liège - ULiège > Département de géographie > Hydrographie et géomorphologie fluviatile >]
Houbrechts, Geoffrey mailto [Université de Liège - ULiège > Département de géographie > Département de géographie >]
Peeters, Alexandre mailto [Université de Liège - ULiège > Département de géographie > Géomorphologie et Géologie du Quaternaire >]
Petit, François mailto [Université de Liège - ULiège > Département de géographie > Département de géographie >]
12-Mar-2020
Water (Switzerland)
MDPI AG
12
3
792
Yes (verified by ORBi)
International
2073-4441
Basel
Switzerland
[en] return period ; bankfull recurrence interval ; Gumbel methods of moment ; graphical method ; peaks-over-threshold algorithm ; extreme floods analysis
[en] The determination of the return period of frequent discharges requires the definition of flood peak thresholds. Unlike daily data, the volume of data to be processed with the generalization of hourly data loggers or even with an even finer temporal resolution quickly becomes too large to be managed by hand. We therefore propose an algorithm that automatically extracts flood characteristics to compute partial series return periods based on hourly series of flow rates. Thresholds are defined through robust analysis of field observation-independent data to obtain five independent flood peaks per year in order to bypass the 1-year limit of annual series. Peak over thresholds were analyzed using both Gumbel’s graphical method and his ordinary moments method. Hydrological analyses exhibit the value in the convergence point revealed by this dual method for floods with a recurrence interval around 5 years. Pebble-bedded rivers on impervious substratum (Ardenne rivers) presented an average bankfull discharge return period of around 0.6 years. In the absence of field observation, the authors have defined the bankfull discharge as the Q0.625 computed with partial series. Annual series computations allow Q100 discharge determination and extreme floods recurrence interval estimation. A comparison of data from the literature allowed for the confirmation of the value of Myer’s rating at 18, and this value was used to predict extreme floods based on the area of the watershed.
Laboratoire d'Hydrographie et de Géomorphologie Fluviatile
UR Sphères
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/246033
10.3390/w12030792
https://www.mdpi.com/2073-4441/12/3/792
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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