Science Service System

Summary of Proposal HYD1557

TitleValidationof Garonne River water extent from hydrodynamic models withTerraSAR-X images
Investigator Biancamaria, Sylvain - CNRS - LEGOS, GOHS
Team Member
Dr Goutal, Nicole - EDF, LNHE
Dr Ricci, Sophie - CERFACS URA1875, GLOBC
Mr Garambois, Pierre-Andre - IMFT, HYDROECO
Dr Rogel, Philippe - CERFACS URA1875, GLOBC
Dr Martin, Eric - CNRM, GAME
Pr Monnier, Jerome - INSA, IMT
Summary Theproposed NASA/CNES Surface Water and Ocean Topography (SWOT) wideswath satellite altimetry mission will provide global 2D maps ofwater elevations, water surface volume change and river discharge atan unprecedented resolution. SWOT main scientific payload will be anear nadir Ka-band SAR interferometer. To test this new type ofinstrument some airborne campaigns using a similar instrument areexpected to occur in France in the incoming years. To validate thesenew measurements of 2D water elevations, some field measurements aslong as 2D hydrodynamic models are needed. That's why two potentialtargets for these airborne campaigns over the Garonne River (in SouthWest of France) are proposed: an upstream reach betweenPortet-sur-Garonne and Malause towns and a downstream reach betweenTonneins and La Reole towns. The purpose of this proposal is todevelop accurate 2D hydrodynamic modeling of these two Garonne Riverreaches (using DassFlow and TELEMAC models), which will then be usedto validate and assimilate the airborne measurements. In thiscontext, it is needed to gather all measurements that will help tovalidate these modelings. In-situ measurements of water elevationsand discharge have already been collected. However, to bettervalidate the 2D models, water extent images will be very valuable.TerraSAR-X data are well suited for this purpose, given itshorizontal resolution and the fact its images are not affected byclouds. The minimum requirement for validation is to obtainTerraSAR-X images over the two modeled reaches for at least one dateduring the low flow period (which usually occurs between July andOctober) and one date during the high flow period (which usuallyoccurs between February and May). The models, once implemented,should be able to run for any dates within the TerraSAR-X Archivetime period (January 2008 to present time), allowing a wideflexibility in the images.choice. The requirements on the data arethe need to clearly identify water and non-water area and allpotential sources of errors (some lay-over might be expected due tosome embankment). Getting images acquired with differentconfiguration, like ascending and descending tracks, might be neededin order not have always the same area affected by lay-over. There isno specific deliverables for this project.

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