Application and evaluation of LS-PIV technique for the monitoring of river surface velocities in high flow conditions - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Accéder directement au contenu
Article Dans Une Revue Flow Measurement and Instrumentation Année : 2008

Application and evaluation of LS-PIV technique for the monitoring of river surface velocities in high flow conditions

M. Jodeau
André Paquier
J. Le Coz
  • Fonction : Auteur
Guillaume Dramais

Résumé

Large Scale Particle Image Velocimetry (LS-PIV) is used to measure the surface flow velocities in a mountain stream during high flow conditions due to a reservoir release. A complete installation including video acquisition from a mobile elevated viewpoint and artificial flow seeding has been developed and implemented. The LS-PIV method was adapted in order to take into account the specific constraints of these high flow conditions. Using a usual LS-PIV data processing, significant variations of the water surface elevation were taken into consideration in the image rectification. An intensity threshold was applied to focus on artificial tracers without considering stationary waves and sun reflections on the flow surface. A site-specific float coefficient of 0.79 based on measured vertical velocity profiles was used to convert surface velocities into depth-averaged velocities. Comparison between LS-PIV assessments and 2Dh numerical calculations with the code Rubar20 allows verification and extrapolation of LS-PIV data. LS-PIV velocity measurements permit to assess discharges over the whole high flow event in agreement with leaded current-meter measurements performed at a downstream bridge.
Fichier principal
Vignette du fichier
ly2008-pub00023161.pdf (3.63 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01016952 , version 1 (01-07-2014)

Identifiants

Citer

M. Jodeau, A. Hauet, André Paquier, J. Le Coz, Guillaume Dramais. Application and evaluation of LS-PIV technique for the monitoring of river surface velocities in high flow conditions. Flow Measurement and Instrumentation, 2008, 19 (2), p. 117 - p. 127. ⟨10.1016/j.flowmeasinst.2007.11.004⟩. ⟨hal-01016952⟩
232 Consultations
705 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More