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Water 2018, 10(2), 228; https://doi.org/10.3390/w10020228

Low Frequency Waves Detected in a Large Wave Flume under Irregular Waves with Different Grouping Factor and Combination of Regular Waves

1
Department of Civil and Environmental Engineering DICA, Politecnico di Milano, 20133 Milan, Italy
2
Department of Engineering, University of Campania “Luigi Vanvitelli”, 81031 Aversa, Italy
3
MEDUS (Maritime Engineering Division University of Salerno) Department of Civil Engineering, University of Salerno, 84084 Fisciano (SA), Italy
4
Department of Engineering, Parthenope University of Naples, 80133 Naples, Italy
*
Author to whom correspondence should be addressed.
Received: 26 January 2018 / Revised: 17 February 2018 / Accepted: 19 February 2018 / Published: 23 February 2018
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Abstract

This paper describes a set of experiments undertaken at Universitat Politècnica de Catalunya in the large wave flume of the Maritime Engineering Laboratory. The purpose of this study is to highlight the effects of wave grouping and long-wave short-wave combinations regimes on low frequency generations. An eigen-value decomposition has been performed to discriminate low frequencies. In particular, measured eigen modes, determined through the spectral analysis, have been compared with calculated modes by means of eigen analysis. The low frequencies detection appears to confirm the dependence on groupiness of the modal amplitudes generated in the wave flume. Some evidence of the influence of low frequency waves on runup and transport patterns are shown. In particular, the generation and evolution of secondary bedforms are consistent with energy transferred between the standing wave modes. View Full-Text
Keywords: spectral analysis; low frequency; wave grouping; eigen analysis; eigenmode; random waves; combination waves spectral analysis; low frequency; wave grouping; eigen analysis; eigenmode; random waves; combination waves
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Riefolo, L.; Contestabile, P.; Dentale, F.; Benassai, G. Low Frequency Waves Detected in a Large Wave Flume under Irregular Waves with Different Grouping Factor and Combination of Regular Waves. Water 2018, 10, 228.

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