Article (Scientific journals)
Occurrence and characteristic frequencies of nappe oscillations at free-overfall structures
Kitsikoudis, Vasileios; Lodomez, Maurine; Dewals, Benjamin et al.
2021In Journal of Hydraulic Engineering, 147 (2)
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Keywords :
Experimental hydraulics; Hydraulic model; Nappe oscillations; Spillway; Weir
Abstract :
[en] The present study investigated the occurrence and characteristic frequency of nappe oscillations on weirs by re-analysing data from 52 experimental configurations. The considered configurations include various shapes of the weir crest and a range of weir geometric and hydraulic characteristics with two different scales. Nappes were either confined with lateral and back walls forming a non-vented air pocket between the nappe and the weir or unconfined with atmospheric pressure everywhere around the nappe. Oscillations occurred at nappes with uniformly distributed approaching flow of low velocity and unit discharge between 0.01 and 0.06 m2/s, regardless of the model scale. Weir crests that favoured nappe oscillations had an upstream profile without geometric discontinuities. A dimensionless frequency of nappe oscillations was expressed as a power function of the ratio of fall height to the water depth at the point of detachment at the crest, separately for quarter-round and truncated half-round weir crests. The exponents of the two obtained power functions were very close to each other, which allows the usage of their average so that different weir crests exhibit solely offsetting curves.
Research center :
UEE - Urban and Environmental Engineering - ULiège
Disciplines :
Civil engineering
Author, co-author :
Kitsikoudis, Vasileios ;  Université de Liège - ULiège > Département ArGEnCo > Hydraulics in Environmental and Civil Engineering
Lodomez, Maurine;  SBE-Wallonie
Dewals, Benjamin  ;  Université de Liège - ULiège > Département ArGEnCo > Hydraulics in Environmental and Civil Engineering
Archambeau, Pierre  ;  Université de Liège - ULiège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
Pirotton, Michel ;  Université de Liège - ULiège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
Erpicum, Sébastien  ;  Université de Liège - ULiège > Scientifiques attachés au Doyen (Sc.appliquées)
Language :
English
Title :
Occurrence and characteristic frequencies of nappe oscillations at free-overfall structures
Publication date :
February 2021
Journal title :
Journal of Hydraulic Engineering
ISSN :
0733-9429
Publisher :
American Society of Civil Engineers, United States - New York
Volume :
147
Issue :
2
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 29 November 2020

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