Title: A COMPARISON OF TWO FIELD STUDIES OF ACOUSTIC BED VELOCITY: GRAIN SIZE AND INSTRUMENT FREQUENCY EFFECTS
Abstract: Recent studies (Rennie et al., 2002; Rennie and Villard, 2004) suggest that it may be possible to measure bedload transport rates using measurements obtained with an acoustic Doppler current profiler (ADCP) or similar instrument. The method is based on the ADCP’s bottom-tracking capacity, by which relative motion between the ADCP and sediment particles on the stream bed is normally used to detect instrument motion when making water discharge measurements. Rennie et al. (2002) hypothesized that the difference between the apparent instrument trajectory according to bottom-tracking and the actual instrument trajectory is representative of the average velocity of sediment particles on the stream bed. They designated this corrected bottom-track measurement as the bed velocity (ν), and proposed that it can be used to estimate bedload transport rates via an empirical calibration.
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
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Cited By Count: 6
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