Article (Scientific journals)
Bankfull discharge recurrence interval in gravel bed rivers
Petit, François; Pauquet, A.
1997In Earth Surface Processes and Landforms, p. 685-693
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Keywords :
Bankfull discharge; Gravel bed rivers; Recurrence interval
Abstract :
[en] Bankfull discharge was identified in some 30 gravel-bed rivers representing in total c. 40 gauging stations. The catchment sizes vary from 4km2 to nearly 2700km2. Bankfull discharge values increases with basin size. In the case of gravel-bed rivers developed on an impermeable substratum, the following equation emerges: Qb=0·087 A1·044. Bankfull discharge recurrence interval was determined by fitting maximum annual floods (Ta) into Gumbel’s distribution and then using the partial duration series (Tp) in this same distribution. Recurrence interval is below 0·7 years (Tp) for small pebble-bed rivers developed on an impermeable substratum; it reaches 1·1 to 1·5 years when the catchment size of these rivers exceeds 250km2. Rivers incised in the soft schists of the Famenne show larger channel capacity at bankfull stage, a small width/depth ratio and thus higher recurrence intervals (1·4–5·3 years with Ta and 1–4·4 years with Tp). Baseflow-dominated gravel-bed streams and sandy or silty rivers experience less frequent bankfull discharges, with a recurrence interval higher than 2 or even 3 years (Tp).
Disciplines :
Earth sciences & physical geography
Author, co-author :
Petit, François  ;  Université de Liège - ULiège > Département de géographie > Géomorphologie fluviatile, hydrographie
Pauquet, A.
Language :
English
Title :
Bankfull discharge recurrence interval in gravel bed rivers
Publication date :
1997
Journal title :
Earth Surface Processes and Landforms
ISSN :
0197-9337
eISSN :
1096-9837
Publisher :
John Wiley & Sons, Inc, Chichester, United Kingdom
Special issue title :
22
Pages :
685-693
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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