Modeling sediment yields in Italian catchments.

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dc.contributor.authorvan Rompaey, Anton
dc.contributor.authorBazzoffi, Paolo
dc.contributor.authorJones, Robert J. A.
dc.contributor.authorMontanarella, Luca
dc.date.accessioned2009-04-29T13:48:02Z
dc.date.available2009-04-29T13:48:02Z
dc.date.issued2005-02-01
dc.description.abstractSediment yield observations, derived from 40 long-term sedimentation records in Italian reservoirs, were used to calibrate and validate the spatially distributed sediment delivery model WaTEM/SEDEM using the best data available at national scale. The sediment yield data set includes records from semi-natural catchments in northern Italy as well as agricultural and semi-natural basins in central and southern Italy. The average size of the catchments is 150 km2 with mean annual sediment yields ranging from 0.20 to 20 t ha−1 year−1. WaTEM/SEDEM estimates mean annual sediment fluxes to permanent river channels. Depending on the local transport capacity, the sediment flux is detachment-limited or transport-limited. The optimal transport capacity parameters for Italian conditions were derived via automatic calibration procedures. A global model calibration procedure taking into account all catchments in the dataset led to an overestimation of the sediment yield for the mountain catchments and an underestimation for the non-mountain catchments. Sediment yield estimates are more reliable when calibration procedures are applied separately for mountain and non-mountain catchments. The model performance of WaTEM/SEDEM is rather poor in the mountain catchments (R=0.25), which suggests that the model structure is too simplified to come to an adequate description of the sediment fluxes. The model performance for the non-mountain catchments, which are more important from a management point of view, is significantly better (R=0.51). Considering the fact that data layers with a 75×75 m resolution were used, the results are encouraging the further development and application of spatially distributed sediment yield models at regional and national scale levels.en_UK
dc.identifier.citationAnton Van Rompaey, Paolo Bazzoffi, Robert J.A. Jones, Luca Montanarella, Modeling sediment yields in Italian catchments, Geomorphology, Volume 65, Issues 1-2, 1 February 2005, Pages 157-169en_UK
dc.identifier.issn0169-555X
dc.identifier.urihttp://dx.doi.org/10.1016/j.geomorph.2004.08.006
dc.identifier.urihttp://hdl.handle.net/1826/3366
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.subjectSediment yielden_UK
dc.subjectSoil erosionen_UK
dc.subjectReservoirsen_UK
dc.subjectItalyen_UK
dc.titleModeling sediment yields in Italian catchments.en_UK
dc.typePostprinten_UK

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