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RESEARCH PRODUCT
Testing slope effect on flow resistance equation for mobile bed rills
Costanza Di StefanoVincenzo PalmeriVincenzo PampaloneVito Ferrosubject
Flow resistancesoil erosion010504 meteorology & atmospheric sciences0208 environmental biotechnology02 engineering and technology01 natural sciencesplot measurement020801 environmental engineeringvelocity profileSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliGeotechnical engineeringflow resistancerill hydraulicGeology0105 earth and related environmental sciencesWater Science and Technologydescription
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 Î, 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 DarcyâWeisbach 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-02-12 | Hydrological Processes |