Open ocean regimes of relative dispersion
TypeArticles dans des revues avec comité de lecture
As two fluid particles separate in time, the entire spectrum of eddy motions is being sampled from the smallest to the largest scales. In large-scale geophysical systems for which the Earth rotation is important, it has been conjectured that the relative diffusivity should vary respectively as D2 and D4/3 for distances respectively smaller and larger than a well-defined forcing scale of the order of the internal Rossby radius (with D the r.m.s. separation distance). Particle paths data from a mid-latitude float experiment in the central part of the North Atlantic appear to support these statements partly: two particles initially separated by a few km within two distinct clusters west and east of the mid-Atlantic ridge, statistically dispersed following a Richardson regime (D2∼t3 asymptotically) for r.m.s. separation distances between 40 and 300 km, in agreement with a D4/3 law. At early times, and for smaller separation distances, an exponential growth, in agreement with a D2 law, was briefly observed but only for the eastern cluster (with an e-folding time around 6 days). After a few months or separation distances greater than 300 km, the relative dispersion slowed down naturally to the Taylor absolute dispersion regime.
Files in this item
Showing items related by title, author, creator and subject.
VAN RUYMBEKE, Bruno; MURAI, Yuichi; TASAKA, Yuji; OISHI, Yoshihiko; GABILLET, Céline; COLIN, Catherine; LATRACHE, Noureddine (The Visualization Society of Japan, 2016)We develop a novel method to study the gas phase features in a bubbly Taylor–Couette flow when bubbles are arranged as elevated toroidal strings. The flow is recorded in the front view plane with a highspeed camera for a ...
FOKOUA, Georges; GABILLET, Céline; AUBERT, Adrien; COLIN, Catherine (2014)The study is an experimental investigation of the interactions between bubbles, coherent motion and viscous drag in a Taylor Couette flow, for the outer cylinder at rest. The cylinder radii ratio η is 0.91. Bubbles are ...
NDONGO FOKOUA, Georges; GABILLET, Céline; AUBERT, Adrien; COLIN, Catherine (AIP Publishing, 2015)An experimental investigation of the interactions between bubbles, coherent motion and viscous drag in a Taylor-Couette flow with the outer cylinder at rest is presented. The cylinder radii ratio η is 0.91. Bubbles are ...
FOKOUA, Georges; GABILLET, Céline; COLIN, Catherine (2013)This study is an experimental investigation of the interactions between the bubbles, the coherent motion and the viscous drag in a Taylor Couette flow, for the outer cylinder at rest. The cylinder radius ratio is 0.9. ...
CROCI, Kilian; ARRIGONI, Michel; BOYCE, P; GABILLET, Céline; GRANDJEAN, Hervé; JACQUES, Nicolas; KERAMPRAN, Steven (2014)Mine fields and UneXploded Ordnances (UXO) become a danger regarding maritime activities. Since UXOs are strongly affected by marine corrosion after decades, they cannot be handled safely. A safe solution to get rid of ...