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Open AccessArticle

Are We Correctly Using Discharge Coefficients for Side Weirs? Insights from a Numerical Investigation

Department of Civil, Environmental and Architectural Engineering, University of L’Aquila, Via Gronchi, 18, 67100 L’Aquila, Italy
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Water 2019, 11(12), 2585; https://doi.org/10.3390/w11122585
Received: 17 November 2019 / Revised: 4 December 2019 / Accepted: 6 December 2019 / Published: 7 December 2019
(This article belongs to the Section Hydraulics and Hydrodynamics)
A key issue in the design of side weirs is the experimental assessment of the discharge coefficient. This can be determined by laboratory measurements of discharge and water depths at the up- and downstream ends of the weir by using De Marchi’s approach, consisting in the solution of the 1D dynamic equation of spatially varied steady flow with non-uniform discharge, under the assumption of energy conservation. This study originates from a recent alarming proliferation of works that evaluate the discharge coefficient for side weirs without clearly explaining the experimental methodology and/or even incorrectly applying modelling approaches, thus generating possible misinterpretations of the results. In this context, the present paper aims to highlight the effects of using oversimplified and/or heterogenous models (relying on different assumptions) for the experimental determination of the discharge coefficient for side weirs. Furthermore, a sensitivity analysis is performed to detect the most influencing hydraulic and geometric parameters on each considered model. The overall results clearly indicate the wrongness of using or building not homogeneous discharge coefficient datasets to obtain and/or compare predictive experimental discharge coefficient formulas. We finally show how neural networks could provide a possible solution to these heterogeneity issues. View Full-Text
Keywords: discharge coefficient; side weir; modelling; De Marchi; neural networks discharge coefficient; side weir; modelling; De Marchi; neural networks
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MDPI and ACS Style

Di Bacco, M.; Scorzini, A.R. Are We Correctly Using Discharge Coefficients for Side Weirs? Insights from a Numerical Investigation. Water 2019, 11, 2585.

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