Testing slope effect on flow resistance equation for mobile bed rills

Hydrological Processes - Tập 32 Số 5 - Trang 664-671 - 2018
Costanza Di Stefano1, Vito Ferro2, Vincenzo Palmeri1, Vincenzo Pampalone1
1Department of Agricultural, Food and Forest Sciences, University of Palermo, Viale delle Scienze, Building 4, Palermo 90128, Italy
2Department of Earth and Marine Science, University of Palermo, Via Archirafi 20, Palermo, 90123 Italy

Tóm tắt

AbstractIn 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.

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Hydrological Processes

Tập 32 Số 5

664-671

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