Near-bed eddy scales and clear-water local scouring around vertical cylinders

Coscarella, Francesco; Gaudio, Roberto; Manes, Costantino

doi:10.1080/00221686.2019.1698668

Cited by 24 publications

(9 citation statements)

References 37 publications

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“…14). Overall, the analysis of hundreds of field and laboratory data revealed that the corrections proposed elsewhere [6,9] have a negligible impact on the present theory in terms of practical applications.…”

Section: Jet Energetics and Shear Stress At Interface Of The Granular Materialsmentioning

confidence: 77%

“…To obtain a scaling expression for τ c , we use c ∼ s − gd for small to coarse sand [15,25,39,45]. (Note that Coscarella et al [9] argued that τ c can be assumed to be independent from slope effects where maximum scour…”

Section: Enforcement Of the Equilibrium Conditionmentioning

confidence: 99%

“…Bonetti et al [6], on the other hand, presented an alternative approach for the derivation of Manning's formula via the use of the co-spectral budget, the assumption of equilibrium, and the adoption of an ad-hoc version of the spectrum. Following the seminal works of Bombardelli and Gioia, other authors have recently conducted studies to provide insights on scour phenomena in correspondence with a vertical cylinder (e.g., a single bridge pier) in granular beds [9,28]. In particular, by means of the PTT, Manes and Brocchini [28] clarified the effect of governing parameters on scour mechanisms.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, by means of the PTT, Manes and Brocchini [28] clarified the effect of governing parameters on scour mechanisms. Coscarella et al [9] revised the theory proposed by Manes and Brocchini [28] and further explored the scaling of equilibrium scour depth. Likewise, Musa et al [30] applied the PTT to scour processes caused by marine hydrokinetic turbines installed in erodible channels.…”

Section: Introductionmentioning

confidence: 99%

“…In doing so, they proposed a modification of some scaling assumptions made by Gioia and Bombardelli [16], introducing two ad hoc scaling functions (α 1 and α 2 ). According to Coscarella et al [9], α 1 "links local to global velocity gradients over the bed-normal direction", whereas α 2 relates the local mean to the bulk Turbulent Kinetic Energy (TKE) dissipation rate. Bonetti et al [6] concluded that the product α 1 α 2 should scale with (k s /R h ) −1/3 f d , where k s indicates the roughness height, R h the hydraulic radius, and f d is a friction factor.…”

Section: Introductionmentioning

confidence: 99%

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Time-dependent scour processes on granular beds at large scale

et al. 2021

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A theoretical framework, based on the phenomenological theory of turbulence applied to scour-related processes due to plunging jets on cohesionless beds, is considered in this paper. More specifically, its predictive capability is assessed herein for large-scale domains, after it was developed for small scales elsewhere. The analysis focuses on both the time-evolution process and the equilibrium configuration for a wide range of hydraulic structures. After revisiting the theory for the temporal evolution of the scour processes, the scour for large-scale tests is investigated using unpublished experiments performed at Colorado State University by the last author. These tests confirm the existence of two stages in the scour hole development, namely the developing and developed phases. Thus, the scour dynamics at large scales is shown to be consistent with that at smaller scales. Then, the theory recently introduced by the first three authors is used to predict the time evolution of scour, corroborating that the very same equations, together with the same coefficients, provide successful predictions, regardless of scale and granulometric distribution. Finally, the theory is again verified against laboratory data on PK weirs obtained at the University of Pisa. Overall, the work described in the paper offers a tool with general validity.

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Section: Jet Energetics and Shear Stress At Interface Of The Granular Materialsmentioning

confidence: 77%

Section: Enforcement Of the Equilibrium Conditionmentioning

confidence: 99%