TY - JOUR

T1 - Testing slope effect on flow resistance equation for mobile bed rills

AU - Ferro, Vito

AU - Di Stefano, Costanza

AU - Pampalone, Vincenzo

AU - Palmeri, Vincenzo

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

KW - Water Science and Technology

KW - flow resistance

KW - plot measurements

KW - rill hydraulics

KW - soil erosion

KW - velocity profile

KW - Water Science and Technology

KW - flow resistance

KW - plot measurements

KW - rill hydraulics

KW - soil erosion

KW - velocity profile

UR - http://hdl.handle.net/10447/279300

UR - http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1099-1085

M3 - Article

VL - 32

SP - 664

EP - 671

JO - Hydrological Processes

JF - Hydrological Processes

SN - 0885-6087

ER -