The Curve Number method is widely used in hydrology because it’s simply based on a single parameter, CN, that represents the basin absorption. In this paper CN is evaluated at basin scale from rainfall-runoff multi-daily events (Mockus, 1964), in the observation period 1940-1997 (record length mean equal to 20 years), for 61 Sicilian basin with three different methods: NEH4 method, Asymptotic fitting method (Hawkins, 1990, Hawkins et al., 2002, Hawkins et al., 2009), Least squares method (Woodward et al., 2006, Hawkins et al., 2009). A first analysis of Sicilian watershed behavior indicates a major occurrence of standard CN response (42 basins), rather than complacent response (11 basins) and no violent behavior. The original assumption of Initial abstraction ratio (Ia/S or lambda) equal to 0.20, is investigated for watersheds with standard CN response, using “natural” and “ordered” rainfall-runoff data. Results indicate a median lambda value of 0, for natural data and 0.035, for ordered data, according to recently world-wide researches (Hawkins et al., 2010).

D'ASARO, F., GRILLONE, G. (2010). RUNOFF CURVE NUMBER METHOD IN SICILY: CN DETERMINATION AND ANALYSIS OF THE INITIAL ABSTRACTION RATIO. In Proceedings of the Joint Federal Interagency Conference 2010: Hydrology and Sedimentation for a Changing Future: Existing and Emerging Issues. Joint Federal Interagency Conference 2010.

RUNOFF CURVE NUMBER METHOD IN SICILY: CN DETERMINATION AND ANALYSIS OF THE INITIAL ABSTRACTION RATIO

D'ASARO, Francesco;GRILLONE, Giovanni
2010-01-01

Abstract

The Curve Number method is widely used in hydrology because it’s simply based on a single parameter, CN, that represents the basin absorption. In this paper CN is evaluated at basin scale from rainfall-runoff multi-daily events (Mockus, 1964), in the observation period 1940-1997 (record length mean equal to 20 years), for 61 Sicilian basin with three different methods: NEH4 method, Asymptotic fitting method (Hawkins, 1990, Hawkins et al., 2002, Hawkins et al., 2009), Least squares method (Woodward et al., 2006, Hawkins et al., 2009). A first analysis of Sicilian watershed behavior indicates a major occurrence of standard CN response (42 basins), rather than complacent response (11 basins) and no violent behavior. The original assumption of Initial abstraction ratio (Ia/S or lambda) equal to 0.20, is investigated for watersheds with standard CN response, using “natural” and “ordered” rainfall-runoff data. Results indicate a median lambda value of 0, for natural data and 0.035, for ordered data, according to recently world-wide researches (Hawkins et al., 2010).
Settore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-Forestali
Settore ICAR/02 - Costruzioni Idrauliche E Marittime E Idrologia
1-lug-2010
2nd Joint Federal Interagency Conference (4th Federal Interagency Hydrologic Modeling Conference and the 9th Federal Interagency Sedimentation Conference): "Hydrology and Sedimentation for a Changing Future: Existing and Emerging Issues"
Las Vegas (Nevada, USA)
June 27 – July 1, 2010
2
00
D'ASARO, F., GRILLONE, G. (2010). RUNOFF CURVE NUMBER METHOD IN SICILY: CN DETERMINATION AND ANALYSIS OF THE INITIAL ABSTRACTION RATIO. In Proceedings of the Joint Federal Interagency Conference 2010: Hydrology and Sedimentation for a Changing Future: Existing and Emerging Issues. Joint Federal Interagency Conference 2010.
Proceedings (atti dei congressi)
D'ASARO, F; GRILLONE, G
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/51118
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