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Synchronous measurements of the velocity and concentration in low density turbidity currents using an Acoustic Doppler Velocimeter

Hosseini, S. A ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. DOI: 10.1016/j.flowmeasinst.2005.05.002
  3. Publisher: 2006
  4. Abstract:
  5. Low density turbidity currents have been investigated in a laboratory flume. An Acoustic Doppler Velocimeter (ADV) was used to measure the velocity. The dimensionless velocity profiles were compared with previous studies to check the accuracy of acoustic measuring techniques for turbidity currents. Successful use of the ADV to measure the current velocity has led to interest in the technique of using acoustic sensors to estimate concentrations. Acoustic backscattering analyses are used for estimating the sediment concentration in turbidity currents. With this approach, concentration measurements can be reasonably well represented by a similarity profile. Using this technique, an accurate estimation of the concentration close to the bed, where obtaining reliable concentration data by sampling techniques is difficult, is possible. The results show that a power relation is a good estimate for the concentration distribution in this region, for which no reliable expressions have been provided previously. Successful estimation of the velocity and concentration, in the present experiments, indicates that this technique could be appropriate and useful for determining the flow structure in turbidity currents. © 2005 Elsevier Ltd. All rights reserved
  6. Keywords:
  7. Acoustic wave backscattering ; Acoustic wave velocity ; Density measurement (optical) ; Flow of water ; Sediment transport ; Turbidity ; Ultrasonic Doppler velocimeters ; Velocity measurement ; Acoustic Doppler Velocimeter (ADV) ; Backscattering analyses ; Low density turbidity current ; Sediment concentration ; Turbid water ; Flow measurement ; Acoustic velocimeter ; Turbidity current ; Velocity measurement
  8. Source: Flow Measurement and Instrumentation ; Volume 17, Issue 1 , 2006 , Pages 59-68 ; 09555986 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0955598605000580