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RUSLE [revised universal soil loss equation] applied in a GIS framework: calculating the LS factor and deriving homogenous patches for estimating soil loss / L.A. Lewis in International journal of geographical information science IJGIS, vol 19 n° 7 (august 2005)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 19 n° 7 (august 2005) . - pp 809 - 829 Titre : RUSLE [revised universal soil loss equation] applied in a GIS framework: calculating the LS factor and deriving homogenous patches for estimating soil loss Type de document : Article/Communication Auteurs : L.A. Lewis, Auteur ; G. Verstraeten, Auteur ; H. Zhu, Auteur Année de publication : 2005 Article en page(s) : pp 809 - 829 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse comparative [Termes IGN] érosion [Termes IGN] Flandre (Belgique) [Termes IGN] IDRISI [Termes IGN] Massachusetts (Etats-Unis) [Termes IGN] modèle numérique de terrain [Termes IGN] modèle RUSLE [Termes IGN] surveillance géologique [Termes IGN] système d'information géographique Résumé : (Auteur) The RUSLE (Revised Universal Soil Loss Equation) is integrated within a GIS framework to calculate soil loss spatially. For this module, algorithms and procedures were developed to derive the slope length factor (L) and steepness factor (S) from a DEM, then integrated with the R, K, C, and P factors to develop homogeneous patches (sub-units) within each field or river basin. Soil loss is determined for each patch within a study unit, and then combined to determine the fields' or river basin's average annual and total soil loss. Two case studies are presented. The first case study, in central Massachusetts, compares estimated soil loss values obtained for individual fields using the Idrisi RUSLE module to USDA-NRCS RUSLE field data. While soil loss results were similar, the RUSLE module allows fields to be partitioned into more similar units than practical in the field. This permits detailed spatial analysis of soil-loss patterns. The second case study compares soil-loss estimates for a catchment in southwestern Flanders, Belgium. This model-model comparison contrasts the results from the RUSLE module to the WATEM model-a grid cell based model based on the USLE/RUSLE but conceptualized in a multi-flow context. Results between the predicted soil losses utilizing the two different approaches are significantly correlated. However, estimated soil losses are consistently higher for the WATEM model. This likely reflects the differences between how the two models compute L as well as the contribution of ephemeral gullies and flow convergence which are incorporated in WATEM but not in RUSLE. Numéro de notice : A2005-356 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810500105705 En ligne : https://doi.org/10.1080/13658810500105705 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27492 [article]

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