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Article

Secondary Currents with Scour Hole at Grade Control Structures

Department of Civil, Environmental, Land, Building Engineering and Chemistry, Polytechnic University of Bari, Via E. Orabona 4, 70125 Bari, Italy
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Academic Editor: Roberto Gaudio
Water 2021, 13(3), 319; https://doi.org/10.3390/w13030319
Received: 25 December 2020 / Revised: 22 January 2021 / Accepted: 23 January 2021 / Published: 28 January 2021
Most studies on local scouring at grade control structures have principally focused on the analysis of the primary flow field, predicting the equilibrium scour depth. Despite the numerous studies on scouring processes, secondary currents were not often considered. Based on comprehensive measurements of flow velocities in clear water scours downstream of a grade control structure in a channel with non-cohesive sediments, in this study, we attempted to investigate the generation and turbulence properties of secondary currents across a scour hole at equilibrium condition. The flow velocity distributions through the cross-sectional planes at the downstream location of the maximum equilibrium scour depth clearly show the development of secondary current cells. The secondary currents form a sort of helical-like motion, occurring in both halves of the cross-section in an axisymmetric fashion. A detailed analysis of the turbulence intensities and Reynolds shear stresses was carried out and compared with previous studies. The results highlight considerable spatial heterogeneities of flow turbulence. The anisotropy term of normal stresses dominates the secondary shear stress, giving the impression of its crucial role in generating secondary flow motion across the scour hole. The anisotropy term shows maximum values near both the scour mouth and the scour bed, caused, respectively, by the grade control structure and the sediment ridge formation, which play fundamental roles in maintaining and enhancing the secondary flow motion. View Full-Text
Keywords: scour; equilibrium condition; velocity field; secondary currents; turbulence scour; equilibrium condition; velocity field; secondary currents; turbulence
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MDPI and ACS Style

Ben Meftah, M.; De Padova, D.; De Serio, F.; Mossa, M. Secondary Currents with Scour Hole at Grade Control Structures. Water 2021, 13, 319. https://doi.org/10.3390/w13030319

AMA Style

Ben Meftah M, De Padova D, De Serio F, Mossa M. Secondary Currents with Scour Hole at Grade Control Structures. Water. 2021; 13(3):319. https://doi.org/10.3390/w13030319

Chicago/Turabian Style

Ben Meftah, Mouldi; De Padova, Diana; De Serio, Francesca; Mossa, Michele. 2021. "Secondary Currents with Scour Hole at Grade Control Structures" Water 13, no. 3: 319. https://doi.org/10.3390/w13030319

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