Closure to “Darcy‐Weisbach Roughness Coefficients for Gravel and Cobble Surface” by John E. Gilley, Eugene R. Kottwitz, and Gary A. Wieman (January/February, 1992, Vol., 118, No. 1)

Gilley, John E.; Kottwitz, Eugene R.; Wieman, Gary A.

doi:10.1061/(asce)0733-9437(1993)119:5(912)

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“…Gilley et al . 63 constructed a resistance coefficient equation under pebble cover based on a flume experiment. In these studies, f decreased with increasing flow discharge and decreasing gravel coverage degree, and these findings are consistent with the results of this study.…”

Section: Resultsmentioning

confidence: 99%

Effects of Simulated Gravel on Hydraulic Characteristics of Overland Flow Under Varying Flow Discharges, Slope Gradients and Gravel Coverage Degrees

Xiaona

Fan

et al. 2019

Sci Rep

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To quantify the hydraulic characteristics of overland flow on gravel-covered slopes, eight flow discharges (Q) (8.44–122 L/min), five slope gradients (J) (2°–10°) and four gravel coverage degrees (Cr) (0–30%) were examined via a laboratory flume. The results showed that (1) gravel changed flow regime. Gravel increased the Reynolds number (Re) by 2.94–33.03%. Re were less affected by J and positively correlated with Cr and Q. Gravel decreased the Froude number (Fr) by 6.83–77.31%. Fr was positively correlated with Q and J and negatively correlated with Cr. (2) Gravel delayed the flow velocity (u) and increased the flow depth (h) and flow resistance (f). Gravel reduced u by 1.20–58.95%. u was positively correlated with Q and J and negatively correlated with Cr. Gravel increased h by 0.12–2.41 times. h was positively correlated with Q and Cr and negatively correlated with J. Gravel increased f by 0.15–18.42 times. f were less affected by J, positively correlated with Cr and negatively correlated with Q. (3) The relationships between hydraulic parameters and Q, J and Cr identified good power functions. Hydraulic parameters were mainly affected by Cr. These results can guide the ecological construction of soil and water conservation.

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Section: Resultsmentioning

confidence: 99%