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MÉTHODOLOGIE D'EXPLOITATION QUANTITATIVE DES PHOTOGRAPHIES AÉRIENNES D'INONDATION DE PLAINE

Abstract : The main aim of this work is to develop a methodology to get profits on aerial photographs taken during flooding. More precisely, it consists in extracting water level at any points of the floodplain when photographs were taken. The suggested methodology, called "photo-approach", begins with a remote sensing step, continues with a spatial analysis and a GIS structuration step, and ends with an innovative and original step consisting in fusion and consistency handling of the whole of the extracted data (algorithm linking hydraulics and artificial intelligence techniques). The method was tested on three sites of study, covering a very broad panel of contexts. An important work of validation and sensitivity analysis proved that precision of water levels estimates, produced in the form [Min, max ], were of decimeter order. This results appear to be completely compatible with hydraulic requirements. The "photo" approach thus constitutes a quantitative valorization of the photographic archives concerning the historical floods. The first repercussion of the "photo-approach" comes from the SIG databases structuring, which generates an easy access to results for all steps of the flood risk management. The second repercussion, much more important, results from possible linkage between the "photo-approach" and traditional approaches. The complementarity study with hydraulic modelling was made with a 2d model on the Hérault river valley. A confrontation of the results shows mutual contribution : 1) "photo" approach for an assistance with the structuring, the parametrization and the validation of hydraulic modelling; 2) on contrary, hydraulic modelling for an help with the "photo" approach validation. This thesis may appears as an illustration of the interest of a multidisciplinary approach.
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https://tel.archives-ouvertes.fr/tel-00003257
Contributor : Damien Raclot <>
Submitted on : Thursday, August 14, 2003 - 7:20:54 PM
Last modification on : Monday, November 9, 2020 - 11:08:06 AM
Long-term archiving on: : Friday, April 2, 2010 - 7:24:07 PM

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  • HAL Id : tel-00003257, version 1

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Damien Raclot. MÉTHODOLOGIE D'EXPLOITATION QUANTITATIVE DES PHOTOGRAPHIES AÉRIENNES D'INONDATION DE PLAINE. Modélisation et simulation. Université Montpellier II - Sciences et Techniques du Languedoc, 2003. Français. ⟨tel-00003257⟩

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