Roughness of Loose Rock Riprap on Steep Slopes

A study was conducted to determine the roughness of rock riprap laid on steep slopes. Tests were conducted in a 1.07 m wide flume and two 2.74 m wide field-scale structures using angular riprap with median diameters D50 ranging from 52 to 278 mm and bed slopes S0 ranging from 0.028 to 0.333 m m. Emp...

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Bibliographic Details
Published in:Journal of hydraulic engineering (New York, N.Y.) N.Y.), 1998-02, Vol.124 (2), p.179-185
Main Authors: Rice, C. E, Kadavy, K. C, Robinson, K. M
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Exact sciences and technology
Hydraulic constructions
River flow control. Flood control
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Summary:A study was conducted to determine the roughness of rock riprap laid on steep slopes. Tests were conducted in a 1.07 m wide flume and two 2.74 m wide field-scale structures using angular riprap with median diameters D50 ranging from 52 to 278 mm and bed slopes S0 ranging from 0.028 to 0.333 m m. Empirical relationships were developed to predict the Manning roughness coefficient as a function of D50 and S0. The Darcy-Weisbach friction factor was predicted as a function of d D84, the relative submergence. Newly developed equations are applicable for riprap placed on slopes from 2.8%-33%. Roughness coefficients calculated using the developed equations were compared with roughness coefficients calculated using equations developed from observations on natural mountain streams.
ISSN:0733-9429
1943-7900
DOI:10.1061/(ASCE)0733-9429(1998)124:2(179)