Seiching Induced by Bichromatic and Monochromatic Wave Conditions: Experimental and Numerical Analysis in a Large Wave Flume

Abstract

This paper describes a set of spectral and eigen analysis in order to identify seiche generation from a large-scale laboratory dataset. The experiments were performed in the large-scale "Canal d'Investigació i Experimentació Marítima" wave flume at the Universitat Politècnica de Catalunya in Spain. Erosive and accretive wave regimes have been analyzed, including monochromatic waves and bichromatic wave groups with different bandwidths. Each test started with approximately the same underlying beach conditions. Video runup measurements are also used to better understand the role of the bandwidth in the generation of swash oscillation. Some evidence of the influence of low frequency waves on runup and sediment transport pattern is found. Good agreements between eigenmode families for volume flux and sediment volume variations are also shown.

Directional Infragravity Waves Induced by Bichromatic and Bidirectional Waves: Theoretical Approach and Experimental Affirmation

“…In small-scale physical models, the second-order effects tend to be even more difficult to identify, because reflection from boundaries introduce undesired perturbation. Experiments conducted in wave flumes (2DV) indicated how difficult it is to correctly generate wave groups or bichromatic waves: reflection from the beach, re-reflection from the wave paddle, free long waves at the wavemaker, absorbing wavemakers, free long waves from the surf zone, moving breaking points (e.g., Shah and Kamphuis 1996;Okayasu et al 1996;Janssen et al 2003;Dong et al 2009;Conde et al 2013Conde et al , 2014bRiefolo et al 2018;Andersen et al 2019). Conducting experiments in wave basins (3D) increases significantly the level of complexity and types of challenges.…”