2017/02/06 by Ana L. Quaresma, Rui M.L. Ferreira, Rui M. L. Ferreira +1 · 1 citation
Earth and Planetary Sciences · Environmental Science · #Hydrology and Sediment Transport Processes #Oceanographic and Atmospheric Processes #Underwater Acoustics Research
paper · doi:10.1080/00221686.2016.1275051
crossref issued 2017/02/06 · crossref published 2017/02/06 · crossref published-online 2017/02/06 · openalex publication_date 2017/02/06 · crossref created 2017/02/06 · crossref published-print 2017/07/04 · crossref deposited 2020/08/29 · openalex created_date 2025/10/10 · crossref indexed 2026/07/30 · openalex updated_date 2026/07/30
Particle image velocimetry (PIV) and acoustic Doppler velocimetry (ADV) were used in a pool-type fishway with bottom orifices to measure velocity at several locations in planes parallel to the bottom and to the sidewalls. Estimates of parameters that influence fishways efficiency, such as water velocity and turbulent kinetic energy (TKE), were compared. Differences in temporal and spatial resolutions of both techniques were assessed. In-plane mean velocity magnitude showed very good agreement between both instruments, with raw measurements presenting similar values of the square of the sample correlation coefficient (R2) and the refined index of agreement (dr) as post-processed ones. The in-plane TKE agreement between both instruments greatly improved with post-processing, with R2 and dr ranging from 0.92 to 0.99, whereas raw values were lower (0.49–0.85). Nonetheless, further investigation is needed on the efficiency of the denoising method at points with sharp velocity gradients in the horizontal velocity components (perpendicular to ADV axis components).