Evaluation of stream initiation thresholds for the SCS-CN model: study cases on 3 Mediterranean catchments

Autor: Cernesson, Flavie, Eid, N.J., Tournoud, M.G., PAYRAUDEAU, Sylvain, Kosuth, Pascal
Přispěvatelé: Territoires, Environnement, Télédétection et Information Spatiale (UMR TETIS), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-AgroParisTech-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Ecole Nationale du Génie Rural, des Eaux et des Forêts (ENGREF), UNIVERSITE BRASILIA BRA, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Université Montpellier 2 - Sciences et Techniques (UM2), ENSAR RENNES, Irstea Publications, Migration
Jazyk: angličtina
Rok vydání: 2005
Předmět:
Zdroj: IAHS-AISH. 7th Scientific Assembly, Foz Do Iguaçu, BRA, avril 2005
IAHS-AISH. 7th Scientific Assembly, Foz Do Iguaçu, BRA, avril 2005, 2005, pp.1
Popis: Digital Elevation Models are commonly used to hydrological features extraction to feed distributed models. One of the first steps for this data acquisition is the choice of the threshold area needed for stream initiation definition. For three French Mediterranean catchments of almost 50 km2 these thresholds were tested. Based on previous results, it was retained 7 proportions of the catchments for these thresholds to analyze the influence over the SCS-CN model ability to calculate the effective precipitation. Calculations have been done using a SPOT4 image interpretation resampled to 50m-grid resolution and the CORINE Land Cover map of the region. For any event, any catchment and for both land cover classifications, the effective precipitation estimation does not depend on the threshold choice until breaks. These breaks correspond to surface thresholds of 1 km2 and 6 km2 (ie around 2% and 10% of the total surface). The paper contributes to proposing assumptions on the relationships between surface thresholds and land cover / land use descriptions.
Databáze: OpenAIRE
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