Applicability of acoustic Doppler devices for flow velocity measurements and discharge estimation in flows with sediment transport

Guillaume Nord, Francesc Gallart, Nicolas Gratiot, Montserrat Soler, Ian Reid, Dina Vachtman, Jér Ôme Latron, Juan Pedro Martín-Vide, Jonathan B. Laronne

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

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 (≥ 150μm) 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 (≤150μm) were transported in suspension; this underestimation was shown to reach 20-30% when suspended sediment concentrations were very high (c. 50-100gL-1).

Original languageEnglish
Pages (from-to)504-518
Number of pages15
JournalJournal of Hydrology
Volume509
DOIs
StatePublished - 13 Feb 2014

Keywords

  • Acoustic Doppler
  • Bedload
  • Discharge
  • Sediment transport
  • Suspended sediment concentration
  • Velocity

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