Attenuation Capacity of a Multi-Cylindrical Floating Breakwater
Abstract
:1. Introduction
2. Cylindrical FBs
3. Physical Modeling
3.1. Test Description
- The incident, reflected, and transmitted waves through two arrays of four resistive wave gauges (WGs) placed in front of (offshore) and behind (shoreward) the FB, logged at 100 Hz;
- The load along the four mooring lines, through four full bridge load cells with maximum load 250 N, analog lowpass-filtered at 500 Hz and subsequently logged at 1200 Hz;
- The movements in sway, heave, and roll, captured by a two-megapixel webcam placed in front of the glass, recorded at 60 fps.
3.2. Results in Terms of Wave Transmission
4. Numerical Model
Data Used in the Numerical Model
5. Numerical Interpretation
5.1. Measured Oscillations
5.2. Measured Wave Transmission
5.3. Sensitivity Analyses
6. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
Abbreviations
CG | Center of Gravity |
DoF | Degree of Freedom |
FB | Floating Breakwater |
HDPE | Extruded High-Density Polyethylene |
RAO | Response Amplitude Operator |
Appendix A. Numerical Model
- (i)
- (ii)
- (iii)
- Find the frequency domain responses using Equation (A9) and hence the RAOs.
- (iv)
- Compute the body velocity by Equation (A10).
- (v)
- Build the actual velocity potential as the sum of the incident, diffracted, and radiated potentials (the unit radiation multiplied by the computed body velocity) as shown in Equation (Figure 3).
- (vi)
- Extract from the actual velocity potential the transmitted and incident wave height, and hence .
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Configurations | (mm) | (mm) | d (mm) | h (mm) | K (N/m) |
---|---|---|---|---|---|
Config. A | 250 | None | 400 | 875 | 1200 |
Config. B | 250 | 125 | 400 | 875 | 1200 |
Config. C | 250 | none | 300 | 875 | 1200 |
Configurations | A | B | C |
---|---|---|---|
Mass (kg) | 77.7 | 87.2 | 77.7 |
Inertia (kg·m2) | 13.15 | 13.44 | 6.95 |
Volume (m3) | 0.0736 | 0.0831 | 0.0736 |
(m) | 0.380 | 0.370 | 0.285 |
(m) | 0.266 | 0.256 | 0.200 |
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Martinelli, L.; Mohamad, O.; Volpato, M.; Eskilsson, C.; Aufiero, M. Attenuation Capacity of a Multi-Cylindrical Floating Breakwater. J. Mar. Sci. Eng. 2024, 12, 1550. https://doi.org/10.3390/jmse12091550
Martinelli L, Mohamad O, Volpato M, Eskilsson C, Aufiero M. Attenuation Capacity of a Multi-Cylindrical Floating Breakwater. Journal of Marine Science and Engineering. 2024; 12(9):1550. https://doi.org/10.3390/jmse12091550
Chicago/Turabian StyleMartinelli, Luca, Omar Mohamad, Matteo Volpato, Claes Eskilsson, and Manuele Aufiero. 2024. "Attenuation Capacity of a Multi-Cylindrical Floating Breakwater" Journal of Marine Science and Engineering 12, no. 9: 1550. https://doi.org/10.3390/jmse12091550