N. Bonneton, D. Sous
In spite of the ubiquity of long shore flows, rip currents, and tidal jets in the near shore, large-scale vortices associated with these phenomena remain poorly understood. The objective of this study is to understand the effect of vertical confinement on vortex dynamics through a new laboratory experiment on pulsed jets, which simulate rip currents, in a shallow water layer. The methodology includes analyzing the evolution of three-dimensional turbulence generated by a pulsed jet under varying conditions characterized by a dimensionless parameter related to injected momentum flux, water depth, and injection duration. The results reveal that when vertical confinement is weak, the jet spreads freely, maintaining fully three-dimensional turbulence; conversely, strong confinement leads to a damping of vertical motions and the formation of large horizontal dipolar structures, with localized three-dimensional vortices identified within these structures. A theoretical model developed from these observations shows good agreement with the empirical measurements, suggesting that these insights could be foundational for physical parametrizations in coastal hydrodynamic models.
@article{e13b36f5-a67c-4b72-8b0d-fc1c933c40a9,
title={Dynamics of large-scale vortices in the near shore},
author={N. Bonneton and D. Sous},
year={2006},
language={en}
}TY - JOUR TI - Dynamics of large-scale vortices in the near shore AU - N. Bonneton AU - D. Sous PY - 2006 LA - en ER -
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