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Effects of DEM resolution and source on soil erosion modelling: a case study using the WEPP model / J.X. Zhang in International journal of geographical information science IJGIS, vol 22 n° 8-9 (august 2008)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n° 8-9 (august 2008) . - pp 925 - 942 Titre : Effects of DEM resolution and source on soil erosion modelling: a case study using the WEPP model Type de document : Article/Communication Auteurs : J.X. Zhang, Auteur ; K.T. Chang, Auteur ; J. Qiong, Auteur Année de publication : 2008 Article en page(s) : pp 925 - 942 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] bassin hydrographique [Termes IGN] bassin sédimentaire [Termes IGN] érosion hydrique [Termes IGN] Idaho (Etats-Unis) [Termes IGN] limite de résolution géométrique [Termes IGN] modèle de simulation [Termes IGN] modèle numérique de surface [Termes IGN] pente [Termes IGN] précision des données [Termes IGN] prévention des risques [Termes IGN] réseau hydrographique [Termes IGN] ruissellement Résumé : (Auteur) Digital elevation models (DEMs) vary in resolution and accuracy by the production method. DEMs with different resolutions and accuracies can generate varied topographic and hydrological features, which can in turn affect predictions by soil erosion models, such as the WEPP (Water Erosion Prediction Project) model. This study investigates the effects of DEMs on deriving topographic and hydrological attributes, and on predicting watershed erosion using WEPP v2006.5. Six DEMs at three resolutions from three sources were prepared for two small forested watersheds located in northern Idaho, USA. These DEMs were used to calculate topographic and hydrological parameters that served as inputs to WEPP. The model results of sediment yields and runoffs were compared with field observations. For both watersheds, DEMs with different resolutions and sources generated varied watershed shapes and structures, which in turn led to different extracted hill slope and channel lengths and gradients, and produced substantially different erosion predictions by WEPP. Copyright Taylor & Francis Numéro de notice : A2008-309 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810701776817 En ligne : https://doi.org/10.1080/13658810701776817 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29302 [article]

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