Publications des scientifiques de l'IRD

Nord G., Gallart F., Gratiot Nicolas, Soler M., Reid I., Vachtman D., Latron J., Martin-Vide J. P., Laronne J. B. (2014). Applicability of acoustic Doppler devices for flow velocity measurements and discharge estimation in flows with sediment transport. Journal of Hydrology, 509, p. 504-518. ISSN 0022-1694.

Titre du document
Applicability of acoustic Doppler devices for flow velocity measurements and discharge estimation in flows with sediment transport
Année de publication
2014
Type de document
Article référencé dans le Web of Science WOS:000331662800040
Auteurs
Nord G., Gallart F., Gratiot Nicolas, Soler M., Reid I., Vachtman D., Latron J., Martin-Vide J. P., Laronne J. B.
Source
Journal of Hydrology, 2014, 509, p. 504-518 ISSN 0022-1694
Acoustic Doppler devices (Unidata Starflow) have been deployed for velocity measurements and discharge estimates in five contrasted open-channel flow environments, with particular attention given to the influence of sediment transport on instrument performance. The analysis is based on both field observations and flume experiments. These confirm the ability of the Starflow to provide reliable discharge time-series, but point out its limitations when sediment is being transported. (i) After calibration of the instrument by the Index Velocity Method, the deviation from reference discharge measurements was <20% at the 95% confidence level. (ii) In ungauged conditions at high flows, the Starflow was particularly useful in providing velocity data for approximating measurements of discharge. (iii) However, channel and flume experiments revealed the effects of mobilised sediment on velocity estimates: coarse particles (>= 150 mu m) transported by way of saltation or as bedload caused a significant underestimation of velocity by as much as 50%; a slight underestimation (10-15%) was also observed when significant quantities of fine particles (<= 150 mu m) were transported in suspension; this underestimation was shown to reach 20-30% when suspended sediment concentrations were very high (c. 50-100 g L-1).
Plan de classement
Hydrologie [062] ; Géologie et formations superficielles [064]
Description Géographique
ISRAEL ; ESPAGNE
Localisation
Fonds IRD [F B010061808]
Identifiant IRD
fdi:010061808
Contact