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Article

Determination of Force Coefficients for a Submerged Rigid Breakwater under the Action of Solitary Waves

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Dipartimento di Ingegneria Civile, Università della Calabria, via Bucci, cubo 42B, 87036 Arcavacata di Rende (CS), Italy
2
Dipartimento D.I.C.E.A.M., Università degli Studi Mediterranea di Reggio Calabria, via Salita Melissari, 89124 Reggio Calabria, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Dominic E. Reev
Water 2021, 13(3), 315; https://doi.org/10.3390/w13030315
Received: 15 December 2020 / Revised: 20 January 2021 / Accepted: 22 January 2021 / Published: 27 January 2021
(This article belongs to the Special Issue Wave-structure Interaction Processes in Coastal Engineering)
We present an analysis related to the evaluation of Morison and transverse force coefficients in the case of a submerged square barrier subject to the action of solitary waves. To this purpose, two-dimensional experimental research was undertaken in the wave flume of the University of Calabria, in which a rigid square barrier was provided by a discrete battery of pressure sensors to determine the horizontal and vertical hydrodynamic forces. A total set of 18 laboratory tests was carried out by varying the motion law of a piston-type paddle. Owing to the low Keulegan–Carpenter numbers of the tests, the force regime of the physical tests was defined by the dominance of the inertia loads in the horizontal direction and of the lift loads in the vertical one. Through the use of the time series of wave forces and the undisturbed kinematics, drag, horizontal inertia, lift, and vertical inertia coefficients in the Morison and transverse semi-empirical schemes were calculated using time-domain approaches, adopting the WLS1 method for the minimization of the difference between the maximum forces and the linked phase shifts by comparing laboratory and calculated wave loads. Practical equations to calculate these coefficients as a function of the wave non-linearity were introduced. The obtained results highlighted the prevalence of the horizontal forces in comparison with the vertical ones which, however, prove to be fundamental for stability purposes of the barrier. An overall good agreement between the experimental forces and those calculated by the calibrated semi-empirical schemes was found, particularly for the positive horizontal and vertical loads. The analysis of the hydrodynamic coefficients showed a decreasing trend for the drag, horizontal inertia, and lift coefficients as a function of the wave non-linearity, while the vertical inertia coefficient underlined an initial increasing trend and a successive slight decreasing trend. View Full-Text
Keywords: submerged rigid breakwater; solitary waves; physical tests; hydrodynamic forces; Morison and transverse formulas; force coefficients submerged rigid breakwater; solitary waves; physical tests; hydrodynamic forces; Morison and transverse formulas; force coefficients
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MDPI and ACS Style

Aristodemo, F.; Tripepi, G.; Gurnari, L.; Filianoti, P. Determination of Force Coefficients for a Submerged Rigid Breakwater under the Action of Solitary Waves. Water 2021, 13, 315. https://doi.org/10.3390/w13030315

AMA Style

Aristodemo F, Tripepi G, Gurnari L, Filianoti P. Determination of Force Coefficients for a Submerged Rigid Breakwater under the Action of Solitary Waves. Water. 2021; 13(3):315. https://doi.org/10.3390/w13030315

Chicago/Turabian Style

Aristodemo, Francesco, Giuseppe Tripepi, Luana Gurnari, and Pasquale Filianoti. 2021. "Determination of Force Coefficients for a Submerged Rigid Breakwater under the Action of Solitary Waves" Water 13, no. 3: 315. https://doi.org/10.3390/w13030315

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