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| Titel |
Intermittency and scaling in wave breaking turbulence |
| VerfasserIn |
O. B. Mahoub, R. Alami, M. O. Bezerra |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250030935
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| Zusammenfassung |
| The main objective of this work would be to find the better turbulent
parameterisation as possible for a range of processes in the environment. Therefore, the
idea is to insert, at sub-grid scales in numerical models, different new
parameterisations with a non homogeneous and non uniform diffusion
and the enstrophy cascade), in order to test them. The observation of the geometry at
different space and time scales (e.g. remote sensing radars that
give information on the roughness and by this way calculate the micro scale
atmospheric turbulence), that implies using the multi fractal analysis, would lead us to
create, or to modify the mathematic algorithms. In other words, the goal of this work
would be the use of the wealth of geometrical and dynamical measurements that the
satellites, or other types of remote sensing, may provide, in order to describe and
parameterise better the environmental turbulent processes. The importance of
measuring intermittency in wave breaking flow is that the use of structure functions and
their difference may be used as a test for changes in the spectrum of turbulence from 2D
to 3D or from a local to a non-local situation. Experiments on a large 100 m Wave
breaking tank at LIM, Spanwave were used to evaluate intermittency for different types
of forcing. Irregular waves exhibit much more intermittency than regular ones. Velocity measurements are then compared with coastal zone diffusion. |
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