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Article

Accurate Open Channel Flowrate Estimation Using 2D RANS Modelization and ADCP Measurements

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Hidralab Ingeniería y Desarrollos, S.L., Spin-Off UCLM, Hydraulics Laboratory, University of Castilla-La Mancha, Av. Pedriza-Camino Moledores s/n, 13071 Ciudad Real, Spain
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Department of Civil Engineering, University of Castilla-La Mancha, Av. Camilo José Cela s/n, 13071 Ciudad Real, Spain
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Author to whom correspondence should be addressed.
Academic Editors: Manousos Valyrakis, Massimo Guerrero, Rui M. L. Ferreira and Katinka Koll
Water 2021, 13(13), 1772; https://doi.org/10.3390/w13131772
Received: 3 June 2021 / Revised: 23 June 2021 / Accepted: 24 June 2021 / Published: 27 June 2021
(This article belongs to the Special Issue Measurements and Instrumentation in Hydraulic Engineering)
Boat-mounted Acoustic Doppler Current Profilers (ADCP) are commonly used to measure the streamwise velocity distribution and discharge in rivers and open channels. Generally, the method used to integrate the measurements is the velocity-area method, which consists of a discrete integration of flow velocity over the whole cross-section. The discrete integration is accomplished independently in the vertical and transversal direction without assessing the hydraulic coherence between both dimensions. To address these limitations, a new alternative method for estimating the discharge and its associated uncertainty is here proposed. The new approach uses a validated 2D RANS hydraulic model to numerically compute the streamwise velocity distribution. The hydraulic model is fitted using state estimation (SE) techniques to accurately reproduce the measurement field and hydraulic behaviour of the free-surface stream. The performance of the hydraulic model has been validated with measurements on two different trapezoidal cross-sections in a real channel, even with asymmetric velocity distribution. The proposed method allows extrapolation of measurement information to other points where there are no measurements with a solid and consistent hydraulic basis. The 2D-hydraulic velocity model (2D-HVM) approach discharge values have been proven more accurate than the ones obtained using velocity-area method, thank to the enhanced use of the measurements in addition to the hydraulic behaviour represented by the 2D RANS model. View Full-Text
Keywords: discharge measurement; ADCP; uncertainty analysis; velocity-area method; 2D-RANS streamwise velocity model; 2D-HVM flowrate estimation discharge measurement; ADCP; uncertainty analysis; velocity-area method; 2D-RANS streamwise velocity model; 2D-HVM flowrate estimation
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MDPI and ACS Style

Figuérez, J.A.; González, J.; Galán, Á. Accurate Open Channel Flowrate Estimation Using 2D RANS Modelization and ADCP Measurements. Water 2021, 13, 1772. https://doi.org/10.3390/w13131772

AMA Style

Figuérez JA, González J, Galán Á. Accurate Open Channel Flowrate Estimation Using 2D RANS Modelization and ADCP Measurements. Water. 2021; 13(13):1772. https://doi.org/10.3390/w13131772

Chicago/Turabian Style

Figuérez, Juan A., Javier González, and Álvaro Galán. 2021. "Accurate Open Channel Flowrate Estimation Using 2D RANS Modelization and ADCP Measurements" Water 13, no. 13: 1772. https://doi.org/10.3390/w13131772

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