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Learning river properties and infering river discharge from SWOT-like data time-series

Garambois, Pierre-André and Roux, Hélène and Monnier, Jérôme Learning river properties and infering river discharge from SWOT-like data time-series. (2015) In: 2nd COSPAR Symposium, 9 November 2015 - 13 November 2015 (Foz do Iguaçu, Brazil). (Unpublished)

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New generations of satellites and sensors offer promising possibilities to overcome the lack of in situ data for hydrological sciences, with increasing spatio-temporal coverage and accuracy ([1, 2]). Nevertheless, inverse problems in hydraulics such as the estimation of river discharges from space are still open questions. Remotely sensed measurements of hydrosystems can provide valuable information but adequate methods are still required to take maximum advantage of it. Lots of studies have shown the possibility of retrieving discharge given the river bathymetry or roughness and/or in situ time series. The new challenge is to use SWOT-type data (that is to say water surface elevation, free surface slope and top width) to inverse the triplet formed by the roughness, the bathymetry and the discharge (A0,K,Q) ([3]). We show that the most complete shallow-water like model allowing to separate the roughness and bathymetry terms is the so-called low Froude model. The few inverse models elaborated for inferring (A0,K,Q) are analyzed in two contexts: 1) only remotely sensed observations of the water surface (surface elevation, width and slope) are available ; 2) one additional water depth measurement (or estimate) is available. Results of hydraulic parameters inversions will be presented for a large dataset of rivers with contrasted properties, in the context of the PEPSI challenge that is an intercomparison project of several discharge inversion methods using SWOT-like data ([4, 5, 3]). Considering effective hydraulic parameterizations (e.g. [6, 7]), depending on observation scale, several perspectives are discussed for data assimilation into 1D and 2D hydraulic models. The temporal sampling of a mission such as SWOT will offer new possibilities in terms of hydraulic visibility for describing and learning river reaches, floodplains, and hydrosystems behaviours. References [1] S. Calmant, F. Seyler, and J. Cretaux, Monitoring continental surface waters by satellite altimetry, Surveys in Geophysics, vol. 29, no. 4-5, pp. 247-269, 2008. [2] D. E. Alsdorf and D. P. Lettenmaier, Tracking fresh water from space, Science, vol. 301, no. 5639, pp. 1491-1494, 2003. [3] P.-A. Garambois and J. Monnier, Inference of effective river properties from remotely sensed observations of water surface, Advances in Water Resources, vol. 79, pp. 103-120, 2015. [4] M. Durand, J. Neal, E. Rodriguez, K. M. Andreadis, L. C. Smith, and Y. Yoon, Estimating reach-averaged discharge for the river severn from measurements of river water surface elevation and slope, Journal of Hydrology, vol.-, no. 0, pp., 2014. [5] C. J. Gleason, L. C. Smith, and J. Lee, Retrieval of river discharge solely from satellite imagery and at-many-stations hydraulic geometry: Sensitivity to river form and optimization parameters, Water Resources Research, vol. 50, no. 12, pp. 9604-9619, 2014. [6] P.-A. Garambois, S. Calmant, H. Roux, A. Paris, J. Monnier, and J. Santos da Silva, Hydraulic visibility and effective cross sections based on hydrodynamical modeling of flow lines gained by satellite altimetry,(submitted), 2015. [7] A. Paris, R. C. Paiva, J. Santos Da Silva, D. Moreira, S. Calmant, P.-A. Garambois, W. Collischonn, M.-P. Bonnet, and F. Seyler, Stage-discharge rating curves based on satellite altimetry and modelled discharge in the amazon basin, Water Ressources Research, revised.

Item Type:Conference or Workshop Item (Speech)
Additional Information:No full-text document attached to this repository.
Audience (conference):International conference without published proceedings
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Other partners > Institut National des Sciences Appliquées de Strasbourg - INSA (FRANCE)
Other partners > Université de Strasbourg - UNISTRA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Université de Toulouse > Université Toulouse - Jean Jaurès - UT2J (FRANCE)
Université de Toulouse > Université Toulouse 1 Capitole - UT1 (FRANCE)
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Deposited On:20 Jul 2016 08:56

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