A mixed procedure, referred to as CN4GA (Curve Number for Green-Ampt), was recently introduced with the aim of distributing in time the net rainfall volume provided at event scale by the Soil Conservation Service - Curve Number (SCS-CN) method. The proposed method consists in employing the Green-Ampt infiltration equation and calibrating both the ponding time and the soil hydraulic conductivity using the initial abstraction and the total volume given by the SCS-CN method. The procedure is here applied on several rainfall-runoff events observed in an Italian watershed. Results confirms the general behavior already noticed in previous studies: the CN4GA procedure provides net rainfall intensities consistent with the runoff observations, the SCS-CN method underestimates peak intensity when applied at sub-daily resolution, and the differences between the two approaches are relevant when the gross rainfall peak occurs at the beginning of the storm and generally in case of multi-peak events.
Curve-Number/Green-Ampt mixed procedure for net rainfall estimation: A case study of the Mignone watershed, IT / Petroselli, A.; Grimaldi, S.; Romano, Nunzio. - In: PROCEDIA ENVIRONMENTAL SCIENCES. - ISSN 1878-0296. - 19:(2013), pp. 113-121. (Intervento presentato al convegno Four Decades of Progress in Monitoring and Modeling of Processes in the Soil-Plant-Atmosphere System: Applications and Challenges tenutosi a Naples nel 19-21 June 2013) [10.1016/j.proenv.2013.06.013].
Curve-Number/Green-Ampt mixed procedure for net rainfall estimation: A case study of the Mignone watershed, IT.
ROMANO, NUNZIO
2013
Abstract
A mixed procedure, referred to as CN4GA (Curve Number for Green-Ampt), was recently introduced with the aim of distributing in time the net rainfall volume provided at event scale by the Soil Conservation Service - Curve Number (SCS-CN) method. The proposed method consists in employing the Green-Ampt infiltration equation and calibrating both the ponding time and the soil hydraulic conductivity using the initial abstraction and the total volume given by the SCS-CN method. The procedure is here applied on several rainfall-runoff events observed in an Italian watershed. Results confirms the general behavior already noticed in previous studies: the CN4GA procedure provides net rainfall intensities consistent with the runoff observations, the SCS-CN method underestimates peak intensity when applied at sub-daily resolution, and the differences between the two approaches are relevant when the gross rainfall peak occurs at the beginning of the storm and generally in case of multi-peak events.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
