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Presentation of the tools developed (part 1). Presentation of the tools developed (part 1). How to optimize the drifters deployment strategy? -> Enrico ZAMBIANCHI , DISAM. 2 different issues. Large scale flow (several info sources) Small scale flow (almost only drifters). - PowerPoint PPT Presentation
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How to optimize the drifters deployment strategy?
-> Enrico ZAMBIANCHI, DISAM
Presentation of the tools developed (part 1)
Large-scale flow
≤ Ro ~ 5 km for coastalMediterranean
areas
No info
[Ro is the typical scale of eddies and mesoscale flow features]
Large-scale flowPrior/current knowledge possible sources (need for synopticity)
ad hoc drifter deployments•past observations of repetitive patterns•knowledge of specific dynamical situations (fronts, LCSs)•HF radar data
LS flow - RecommendationsPrior or initial knowledge required – if missing, plan individual deployments to get an idea of LS flowDistance between deployments ≤ Ro (~ 4-5 km)Deployments on a regular grid, if necessary adapted to specific flow patterns/regimes (fronts, eddies, connecting paths)If constrained by budget and/or logistics, spare drifters in order to redeploy
LS flow – add’l recommendIf you have people running a model or collecting synoptic data, ASK THEM
(the Ro rule of thumb stands anyway)
By-recommendation: study your areas as intensively as you can, install as many radar systems as you can, get yourself a good forecast model…
LS flow: one special issueIn coastal areas several “interesting” features may occur:Lagrangian Coherent Structures are barriers to transport, created by the velocity field. They separate neighbouring sub-areas of a basin which do not exchange fluid with each other, thus limiting the effectiveness of water renewal processes.(the first LCS-targeted massive drifter experiment ever was organized within TOSCA)
Relative dispersionAre sub-mesoscale processes (i.e. processes at scales less than Ro) important?
Relative dispersion measures the separation between pairs of particles
50 m
50 m
50 m
Naples , Toulon and Trieste deployment strategies
Relative = particle pair separation
SS flow - RecommendationAlong with the deployments planned for the Large-Scale flow
deploy triplets!
anywhere in the field, and in particular if there are fronts or other interesting structures