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Your search keyword '"Di Stefano, Costanza"' showing total 33 results
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33 results on '"Di Stefano, Costanza"'

27. Field investigation on rilling in the experimental Sparacia area

Author

Bruno, C, DI STEFANO, Costanza, FERRO, Vito, Bruno, C, Di Stefano, C, and Ferro, V

Subjects
erosione, rill, parcelle sperimentali, Settore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-Forestali
Abstract

In this paper the results of a field investigation on rilling carried out in the experimental Sparacia area are reported. The measurements were made on a plot 6 m wide and 22 m long subjected to natural rainfalls. For ten rainfalls the total soil loss (interrill and rill erosion) was collected in a storage system consisting of two tanks arranged in series at the base of the plot. Rill morphology (rill length and cross-sections) was measured for five rainfall events, while the rill profile was surveyed for three events. First the contribution of each component (rill and interrill erosion) to total soil loss was established. Then the analysis allowed establishment of a power relationship between the rill length and the rill volume. Finally, for three events detailed information on rill erosion and rill morphology allowed verification of the applicability of WEPP and estimation of the rill erodibility constant.

Published
2008

32. Rill flow resistance law under equilibrium bed‐load transport conditions

Author

Vincenzo Pampalone, Vincenzo Palmeri, Alessio Nicosia, Costanza Di Stefano, Vito Ferro, Di Stefano Costanza, Nicosia Alessio, Pampalone Vincenzo, Palmeri Vincenzo, and Ferro Vito

Subjects
Flow resistance, geography, geography.geographical_feature_category, flow velocity profile, self-similarity, rill flow resistance, Mechanics, bed-load, Rill, dimensional analysi, Settore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-Forestali, Geology, Water Science and Technology, Bed load
Abstract

In this paper, a recently deduced flow resistance equation for open channel flow was tested under equilibrium bed-load transport conditions in a rill. First, the flow resistance equation was deduced applying dimensional analysis and the incomplete self-similarity condition for the flow velocity distribution. Then, the following steps were carried out for developing the analysis: (a) a relationship (Equation) between the Γ function of the velocity profile, the rill slope, and the Froude number was calibrated by the available measurements by Jiang et al.; (b) a relationship (Equation) between the Γ function, the rill slope, the Shields number, and the Froude number was calibrated by the same measurements; and (c) the Darcy–Weisbach friction factor values measured by Jiang et al. were compared with those calculated by the rill flow resistance equation with Γ estimated by Equations and. This last comparison demonstrated that the rill flow resistance equation, in which slope and Shields number, representative of sediment transport effects, are introduced, is characterized by the lowest values of the estimate errors.

Published
2019

33. Testing slope effect on flow resistance equation for mobile bed rills

Author

Costanza Di Stefano, Vincenzo Palmeri, Vincenzo Pampalone, Vito Ferro, Di Stefano, Costanza, Ferro, Vito, Palmeri, Vincenzo, and Pampalone, Vincenzo

Subjects
Flow resistance, soil erosion, 010504 meteorology & atmospheric sciences, 0208 environmental biotechnology, 02 engineering and technology, 01 natural sciences, plot measurement, 020801 environmental engineering, velocity profile, Settore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-Forestali, Geotechnical engineering, flow resistance, rill hydraulic, Geology, 0105 earth and related environmental sciences, Water Science and Technology
Abstract

In this paper, a recently theoretically deduced rill flow resistance equation, based on a power-velocity profile, is tested experimentally on plots of varying slopes in which mobile bed rills are incised. Initially, measurements of flow velocity, water depth, cross-sectional area, wetted perimeter and bed slope conducted in 106 reaches of rills incised on an experimental plot having a slope of 14% were used to calibrate the flow resistance equation. Then, the relationship between the velocity profile parameter Γ, the channel slope, and the flow Froude number, which was calibrated using the 106 rill reach data, was tested using measurements carried out in plots having slopes of 22% and 9%. The measurements carried out in the latter slope conditions confirmed that (a) the Darcy–Weisbach friction factor can be accurately estimated using the proposed theoretical approach, and (b) the data were supportive of the slope independence hypothesis of rill velocity stated by Govers.

Published
2018

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