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Contenido archivado el 2024-05-14

Mesoscale Ocean Remote Sensing Experiments for imaging and modelling of internal wave fields by radar sensing

Objetivo



Radar systems (spaceborne or airborne) are active non-disturbing sensors for ocean surface watch. Since the US SEASAT (1978) satellite much understanding has been gained on the possibilities of SAR (Synthetic Aperture Radar) technology. It is established that ocean surface phenomena such as swells, surface slicks, island shadowing etc. are visible on Radar images as well as subsurface hydrodynamic phenomena such as internal waves, internal tides, tidal currents, meddies etc.
In addition to physical oceanographers many different potential users covering a wide variety of marine activities, have expressed a need for local and/or global wave information. Knowledge of wave conditions will assist such fields by increasing the information relevant to their area of interest but also by reducing the costs and improving safety of many operations.
Obviously in serving all these needs, softwares to extract information from Radar images are required. To provide real management tools, human intervention in their use has to be reduced as much as possible. The purpose of this proposal is to contribute to the -development of such precompetitive global tools.
To achieve this goal we nedd independent numerical models which are capable of predicting Radar backscattering for all Radar bands, of extracting ocean surface characteristics at high spatial resolution, of predicting internal wave fields in time and space and of inverting Radar signatures into geophysical parameters. Present used models are not totally reliable to produce quantative results in order to retrieve the 3D structure of the ocean's hydrodynamic. Progress in the understanding and mathematical description of different processes and increasing capacity of modern computers opens the door towards much more detailed, comprehensive models.
However a number of scientific gaps have to be filled before a comprehensive model for the analysis of Radar images can be obtained:
-basic nonlinear hydrodynamic interactions between internal waves and surface gravity/ capillary are only partially understood especially on experimental grounds.
- basic Radar backscatter processes especially for C-band, are not completely taken into account in existing models.
- algorithms for automatic extraction of surface wave parameters from Radar images have to be implemented and tested.
- laboratory Radars have to be tested against laboratory experiments involving internal waves in order to address the main mechanisms involved in Radar imaging.
The proposed MORSE joint effort is picturedas a combination of European skills involving Radar hardware development, imagery processing physical oceanography, and numerical simulation. It also will gather partners ranging from industry to research institutes.
We will make use of our expertise in these fields for the exploitation of part of the enormous amount of SAR images provided by ERS-l European satellite. The Coriolis turntable in Grenoble, classified as an European Large Instrument, will also be used for a pilot study of the W-band Radar to be developed by the MORSE consortium.

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Coordinador

Thomson Marconi Sonar SAS
Aportación de la UE
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Dirección
1,Avenue Astride Briand
94117 Arceuil
Francia

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