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A transport-distance approach to scaling erosion rates : 2. Sensitivity and evaluation of Mahleran

Auteur(s) et Affiliation(s)

Sheffield Centre for International Drylands Research, Dept. of Geography, University of Sheffield, Sheffield, Royaume-Uni
PARSONS, A.J.
Sheffield Centre for International Drylands Research, Dept. of Geography, University of Sheffield, Sheffield, Royaume-Uni
MÜLLER, E.N.
Institut für Geoökologie, Univ., Postdam, Allemagne
BRAZIER, R.E.
Dept. of Geography, Univ., Exeter, Royaume-Uni
POWELL, D.M.
Dept. of Geography, Univ., Leicester, Royaume-Uni
FENTI, B.
Queensland Dept. of Natural Resources, Mines and Energy, Indooroopilly, Australie


Description :
In this paper the AA. have undertaken sensitivity analysis and testing of the soil-erosion model MAHLERAN. Sensitivity analysis of the model provides an indication of why it is difficult to scale erosion estimates spatially, in that the spatial variability of sediment fluxes will be a complex function of storm characteristics, slope form (both topographic and microtopographic) and soil composition. Verification of the model has been carried out by comparison with the analytical approach for unconcentrated flows. Model evaluation has been carried out against detailed field measurements from a rainfall-simulation experiment at Walnut Gulch watershed, Tucson, from 1988 to 1995. The tests show that once a parameter optimization is carried out, it is possible to reproduce the spatio-temporal fluxes of sediment and its particle-size characteristics during the simulated event.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2008, vol. 33, n°. 6, p. 962-984, nombre de pages : 23, Références bibliographiques : 1 p.

Date :
2008

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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