Modelling sediment yield at the experimental SPA2 basin in Sicily
2006
Di Stefano C. | Ferro V. | Pampalone V.
In this paper a spatially distributed model of the hill slope sediment delivery processes, named SEDD, is initially reviewed; the model takes into account the sediment delivery processes due both to hill slope sediment transport and to slope curvature. Then the rainfall and sediment yield events, measured at the experimental station named SPA2, are used both to calibrate the SEDD model and to verify the predictive capability of the distributed sediment delivery approach at event scale. The SEDD model is calibrated at event scale using the measurements carried out at the outlet of the experimental basin in the period December 2000/December 2001 and for the basin discretized into morphological units and stream tubes. The model calibration is used to determine a relationship useful for estimating the unique coefficient beta sub(e) of the model by rainfall erosivity factor R sub(e) at event scale. For testing the predictive capability of the beta sub(e) = f[R sub(e)] relationship, 20 events measured in the period September 2002/April 2005 are used; the comparison between measured values and calculated sediment yield ones for all monitored events shows that the sediment delivery distributed approach has a good predictive ability at event scale. For estimating the sediment yield is also adopted a beta sub(e) value set equal to the median value beta sub(e, m) of all 25 calculated beta sub(e) values. The analysis shows that estimating beta sub(e) by the relationship beta sub(e) = f[R sub(e)] gives a better agreement between measured and calculated sediment yields than the one obtained with the median value beta sub(e, m). Finally, the analysis at annual scale, for the period 2000-2004, allows the estimate of the median value beta sub(a, m) representative of the annual behaviour. The analysis shows that the sediment delivery distributed approach has also a good predictive ability at annual scale
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