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Géométrie 3D des lits de rivière par stéréophotogrammétrie à travers l'eau

Abstract : Environmental questions are of a growing concern for public opinion as well as for national and international policies. A striking example is the one of the rivers : focusing multiple issues from which highly strategic ones (energy, irrigation), usage of their waters lead to a particularly fine compromise. In most commons approaches, state and function of this hydrosystem is described by measuring physical variable or by establishing relationships between variables of interest and physical parameters (hydraulical models, hydrobiological models). The aim of this thesis is hence to propose an answer to the problem of measuring river geometry by remote sensing. We first detail the specific context of river systems and establish a state-of-the-art of remote sensing methods, which shows a lack for light stereo-based methods. Then, we propose a full image acquisition and processing method allowing estimation of river immersed topography. This works involves the use of cheap and light hardware which makes it possible to be used flexibly. Classical stereorestitution methods have been adapted to the specific context of through-water photogrammetry. Finally, refraction correction methods integrating a priori knowledge (hydraulic and spatial consistency) have been developed. This method has been applied on a shallow, gravel-bed river and the accuracy and precision of immersed relief estimation is found to be compatible with requirements of hydrobiological models. We hence developed, tested, and validated an original method for estimating river 3D geometry which can supplement existing ones.
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  • HAL Id : tel-02819745, version 1
  • PRODINRA : 222682

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Denis Feurer. Géométrie 3D des lits de rivière par stéréophotogrammétrie à travers l'eau. Environnement et Société. Université Laval; AgroParisTech, 2008. Français. ⟨tel-02819745⟩

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