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Testing the Modified Sediment Delivery Model (MOSEDD) at SPA2 Experimental Basin, Sicily (Italy)


A new version of a spatially distributed sediment delivery model taking into account the hillslope sediment transport efficiency, named MOSEDD, is presented. This model gives estimates of basin sediment yield at event scale, which are more reliable than those obtained by the original SEDD. For SPA2 basin discretized into morphological units, four different calculation schemes of MOSEDD, including the original SEDD version, were applied. All parameterization schemes of the model were calibrated using 15 events measured at the outlet of the experimental basin in the period February 2005–February 2010. The model calibration was used to determine a relationship between the coefficient βe of the model and the erosivity factor. For the model validation, other six measured events, collected in the period March 2010–February 2014, were used. At event scale, the comparison between measured sediment yield values and calculated ones showed that the three calculation schemes of MOSEDD using a rainfall–runoff erosivity factor (MODB, MODC and MODD) have the best performance in estimating sediment yield with respect to the original version of SEDD. The analysis was also developed at annual scale, for the period 2005–2014, and a relationship between the annual value of the coefficient, βa, of the model and the corresponding erosivity factor was established. This last analysis showed that the sediment delivery distributed approach has also a good predictive ability at annual scale. Copyright © 2016 John Wiley & Sons, Ltd.