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Testing a new rill flow resistance approach using the Water Erosion Prediction Project experimental database
Author(s) -
Nicosia Alessio,
Di Stefano Costanza,
Pampalone Vincenzo,
Palmeri Vincenzo,
Ferro Vito,
Nearing Mark A.
Publication year - 2018
Publication title -
hydrological processes
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.222
H-Index - 161
eISSN - 1099-1085
pISSN - 0885-6087
DOI - 10.1002/hyp.13348
Subject(s) - rill , flow (mathematics) , erosion , flow velocity , power function , geotechnical engineering , environmental science , geology , mechanics , hydrology (agriculture) , database , soil science , mathematics , computer science , geomorphology , physics , mathematical analysis
In this paper, a recently theoretically deduced rill flow resistance equation, based on a power‐velocity profile, was tested using the Water Erosion Prediction Project database. This database includes measurements of flow velocity, water depth, cross section area, wetted perimeter, and bed slope that were made in rills shaped on experimental sites distributed across the continental United States. In particular, three different experimental conditions (only rainfall, only flow, and rain with flow) were examined, and for each condition, the theoretically based relationship for estimating the Γ function of the power velocity profile was calibrated. The results established that (a) the Darcy‐Weisbach friction factor can be accurately estimated using the proposed theoretical approach, and (b) the flow resistance increases with the effect of rainfall impact.