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Sensitivity analysis of EUROSEM using Monte Carlo simulation II::the effect of rills and rock fragments

Veihe, A. and Quinton, John and Poesen, J. (2000) Sensitivity analysis of EUROSEM using Monte Carlo simulation II::the effect of rills and rock fragments. Hydrological Processes, 14 (5). pp. 927-939. ISSN 0885-6087

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    Abstract

    A sensitivity analysis of the surface and catchment characteristics in the European soil erosion model (EUROSEM) was carried out with special emphasis on rills and rock fragment cover. The analysis focused on the use of Monte Carlo simulation but was supplemented by a simple sensitivity analysis where input variables were increased and decreased by 10%. The study showed that rock fragments have a significant effect upon the static output parameters of total runoff, peak flow rate, total soil loss and peak sediment discharge, but with a high coefficient of variation. The same applied to the average hydrographs and sedigraphs although the peak of the graphs was associated with a low coefficient of variation. On average, however, the model was able to simulate the effect of rock fragment cover quite well. The sensitivity analysis through the Monte Carlo simulation showed that the model is particularly sensitive to changes in parameters describing rills and the length of the plane when no rock fragments are simulated but that the model also is sensitive to changes in the fraction of non-erodible material and interrill slope when rock fragments were embedded in the topsoil. For rock fragments resting on the surface, changes in parameter values did not affect model output significantly. The simple sensitivity analysis supported the findings from the Monte Carlo simulation and illustrates the importance when choosing input parameters to describe both rills and rock fragment cover when modelling with EUROSEM.

    Item Type: Article
    Journal or Publication Title: Hydrological Processes
    Uncontrolled Keywords: soil erosion modelling ; sensitivity analysis ; Monte Carlo simulation ; rock fragment cover ; model uncertainty ; EROSION-MODEL EUROSEM ; SOIL-EROSION ; SEDIMENT YIELD ; OVERLAND-FLOW ; SURFACE ; COVER ; TRANSPORT ; POSITION ; RAINFALL ; RUNOFF
    Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
    Departments: Faculty of Science and Technology > Lancaster Environment Centre
    ID Code: 13173
    Deposited By: Dr John Quinton
    Deposited On: 09 Sep 2008 11:16
    Refereed?: Yes
    Published?: Published
    Last Modified: 26 Jul 2012 15:06
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/13173

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