TY - CHAP T1 - Random Ocean Swell-Rays: A Stochastic Framework A1 - Resseguier,Valentin A1 - Hascoët,Erwan A1 - Chapron,Bertrand AD - Lab, SCALIAN DS, Rennes, France AD - OceanDataLab, Locmaria-Plouzané, France AD - Laboratoire d’Océanographie Physique et Spatiale (LOPS), Ifremer, Plouzané, France UR - https://archimer.ifremer.fr/doc/00813/92470/ DO - 10.1007/978-3-031-18988-3_16 N2 - Originating from distant storms, swell systems radiate across all ocean basins. Far from their sources, emerging surface waves have low steepness characteristics, with very slow amplitude variations. Swell propagation then closely follows principles of geometrical optics, i.e. the eikonal approximation to the wave equation, with a constant wave period along geodesics, when following a wave packet at its group velocity. The phase averaged evolution of quasi-linear wave fields is then dominated by interactions with underlying current and/or topography changes. Comparable to the propagation of light in a slowly varying medium, over many wavelengths, cumulative effects can lead to refraction, i.e. change of the direction of propagation of a given wave packet, so that it departs from its initial ray-propagation direction. This opens the possibility of using surface swell systems as probes to estimate turbulence along their propagating path. Y1 - 2023 PB - Springer International Publishing ID - 92470 ER -