Nappe oscillations on free-overfall structures: Experimental analysis

Flow visualization; Hydraulic models; Nappe vibration; Oscillatory flows; Sound measurements; Spillway; Acoustic variables measurement; Architectural acoustics; Audio equipment; High speed cameras; Hydraulic machinery; Hydraulic structures; Spillways; Weirs; Experimental analysis; Limited information; Noise production; Physical process; Quantitative characteristics; Societal impacts; Oscillating flow

Abstract :

[en] Under relatively low heads, the occurrence of nappe oscillation, also known as nappe vibration, may be observed on hydraulic structures with a free overfall, such as weirs, crest gates, and fountains. This phenomenon is characterized by oscillations of the thin flow nappe cascading downstream of the crest and results in a disturbing noise production that increases the environmental and societal impacts of the hydraulic structure. Given limited information available regarding the physical processes involved in this phenomenon, a detailed investigation has been undertaken to characterize the flow for free-overfall structures where nappe oscillation may be of concern. The research is conducted on a prototype-scale linear weir model (weir length of 3.5 m and a fall height of 3 m) using high-speed cameras and audio equipment to characterize the nappe oscillation. The paper presents the quantitative characteristics of the nappe oscillation gained from images and sound analysis, especially in terms of frequency, for aerated and confined nappe configurations. © 2018 American Society of Civil Engineers.

Disciplines :

Civil engineering

Author, co-author :

Lodomez, Maurine ; 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)

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)

Erpicum, Sébastien ; Université de Liège - ULiège > Scientifiques attachés au Doyen (Sc.appliquées)

Language :

English

Title :

Nappe oscillations on free-overfall structures: Experimental analysis

Publication date :

2018

Journal title :

Journal of Hydraulic Engineering

ISSN :

0733-9429

Publisher :

American Society of Civil Engineers (ASCE)

Volume :

144

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Funders :

USU - Utah State University [US-UT] [US-UT]

Available on ORBi :

since 23 August 2019

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Bibliography

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