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Garambois P. A., Calmant Stéphane, Roux H., Paris A., Monnier J., Finaud-Guyot P., Montazem A. S., da Silva J. S. (2017). Hydraulic visibility : using satellite altimetry to parameterize a hydraulic model of an ungauged reach of a braided river. Hydrological Processes, 31 (4), 756-767. ISSN 0885-6087

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Lien direct chez l'éditeur doi:10.1002/hyp.11033

Titre
Hydraulic visibility : using satellite altimetry to parameterize a hydraulic model of an ungauged reach of a braided river
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000393560800001
AuteursGarambois P. A., Calmant Stéphane, Roux H., Paris A., Monnier J., Finaud-Guyot P., Montazem A. S., da Silva J. S.
SourceHydrological Processes, 2017, 31 (4), p. 756-767. ISSN 0885-6087
RésuméWhathydraulic information can be gained from remotely sensed observations of a river's surface? In this study, weanalyze the relationship between river bed undulations and water surfaces for an ungauged reach of the Xingu River, a first-order tributary of the Amazon river. This braided reach is crosscut more than 10 times by a ENVISAT (ENVironmental SATellite) track that extends over 100 km. Rating curves based on a modeled discharge series and altimetric measurements are used, including the zero-flow depth Z(0) parameter, which describes river's bathymetry. River widths are determined from JERS (Japanese Earth Ressources Satellite) images. Hydrodynamic laws predict that irregularities in the geometry of a river bed produce spatial and temporal variations in the water level, as well as in its slope. Observation of these changes is a goal of the Surface Water and Ocean Topography satellite mission, which has a final objective of determining river discharge. First, the concept of hydraulic visibility is introduced, and the seasonality of water surface slope is highlighted along with different flow regimes and reach behaviors. Then, we propose a new single-thread effective hydraulic approach for modeling braided rivers flows, based on the observation scales of current satellite altimetry. The effective hydraulic model is able to reproduce water surface elevations derived by satellite altimetry, and it shows that hydrodynamical signatures are more visible in areas where the river bed morphology varies significantly and for reaches with strong downstream control. The results of this study suggest that longitudinal variations of the slope might be an interesting criteria for the analysis of river segmentation into elementary reaches for the Surface Water Ocean Topography mission that will provide continuous measurements of the water surface elevations, the slopes, and the reach widths.
Plan de classementHydrologie [062] ; Télédétection [126]
Descr. géo.BRESIL ; AMAZONIE ; XINGU COURS D'EAU
LocalisationFonds IRD [F B010069247]
Identifiant IRDfdi:010069247
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010069247

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