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A systematic impact assessment of GRACE error correlation on data assimilation in hydrological models / Maike Schumacher in Journal of geodesy, vol 90 n° 6 (June 2016)  

Public [article]  inJournal of geodesy > vol 90 n° 6 (June 2016) . - pp 537 – 559 Titre : A systematic impact assessment of GRACE error correlation on data assimilation in hydrological models Type de document : Article/Communication Auteurs : Maike Schumacher, Auteur ; Jürgen Kusche, Auteur ; Petra Döll, Auteur Année de publication : 2016 Article en page(s) : pp 537 – 559 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] bassin hydrographique [Termes IGN] corrélation [Termes IGN] données GRACE [Termes IGN] erreur [Termes IGN] filtre de Kalman [Termes IGN] gravimétrie [Termes IGN] Mississippi (fleuve) [Termes IGN] modèle hydrographique Résumé : (auteur) Recently, ensemble Kalman filters (EnKF) have found increasing application for merging hydrological models with total water storage anomaly (TWSA) fields from the Gravity Recovery And Climate Experiment (GRACE) satellite mission. Previous studies have disregarded the effect of spatially correlated errors of GRACE TWSA products in their investigations. Here, for the first time, we systematically assess the impact of the GRACE error correlation structure on EnKF data assimilation into a hydrological model, i.e. on estimated compartmental and total water storages and model parameter values. Our investigations include (1) assimilating gridded GRACE-derived TWSA into the WaterGAP Global Hydrology Model and, simultaneously, calibrating its parameters; (2) introducing GRACE observations on different spatial scales; (3) modelling observation errors as either spatially white or correlated in the assimilation procedure, and (4) replacing the standard EnKF algorithm by the square root analysis scheme or, alternatively, the singular evolutive interpolated Kalman filter. Results of a synthetic experiment designed for the Mississippi River Basin indicate that the hydrological parameters are sensitive to TWSA assimilation if spatial resolution of the observation data is sufficiently high. We find a significant influence of spatial error correlation on the adjusted water states and model parameters for all implemented filter variants, in particular for subbasins with a large discrepancy between observed and initially simulated TWSA and for north–south elongated sub-basins. Considering these correlated errors, however, does not generally improve results: while some metrics indicate that it is helpful to consider the full GRACE error covariance matrix, it appears to have an adverse effect on others. We conclude that considering the characteristics of GRACE error correlation is at least as important as the selection of the spatial discretisation of TWSA observations, while the choice of the filter method might rather be based on the computational simplicity and efficiency. Numéro de notice : A2016-422 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-016-0892-y Date de publication en ligne : 27/02/2016 En ligne : https://doi.org/10.1007/s00190-016-0892-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81314 [article]

Monitoring river ice with Landsat images / L.W. Gatto in Remote sensing of environment, vol 32 n° 1 (01/04/1990)  

Public [article]  inRemote sensing of environment > vol 32 n° 1 (01/04/1990) . - pp 1 - 16 Titre : Monitoring river ice with Landsat images Type de document : Article/Communication Auteurs : L.W. Gatto, Auteur Année de publication : 1990 Article en page(s) : pp 1 - 16 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] Etats-Unis [Termes IGN] fleuve [Termes IGN] glace [Termes IGN] Illinois (fleuve) [Termes IGN] image Landsat-TM [Termes IGN] Mississippi (fleuve) [Termes IGN] Missouri (fleuve) Numéro de notice : A1990-078 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/0034-4257(90)90094-3 En ligne : https://doi.org/10.1016/0034-4257(90)90094-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25496 [article]

vol 13 n° 2 - 01/03/1988 - Loess: Earth surface processes and landforms (Bulletin de Earth surface processes and landforms) / K.S. Richards

Public [n° ou bulletin]  est un bulletin de Earth surface processes and landforms / British Society for Geomorphology (Royaume-Uni) (1976 -)   Titre : vol 13 n° 2 - 01/03/1988 - Loess: Earth surface processes and landforms Type de document : Périodique Auteurs : K.S. Richards, Éditeur scientifique Année de publication : 1988 Importance : 192 p. Format : 20 x 26 cm Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomorphologie [Termes IGN] Alaska (Etats-Unis) [Termes IGN] Chine [Termes IGN] dune [Termes IGN] loess [Termes IGN] Mississippi (fleuve) [Termes IGN] Tunisie Numéro de notice : 57572 Affiliation des auteurs : non IGN Nature : Numéro de périodique Permalink : https://documentation.ensg.eu/index.php?lvl=bulletin_display&id=6732 [n° ou bulletin]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
57572-01	47.20	Revue	Centre de documentation	Géographie - Géosciences	Disponible