Roughness of Loose Rock Riprap on Steep Slopes

Autor:	K. M. Robinson, Kem C. Kadavy, Charles E. Rice
Rok vydání:	1998
Předmět:	Roughness coefficient Flume Friction factor Bedform Mechanical Engineering Geotechnical engineering Surface finish Mountain stream Geology Riprap Water Science and Technology Civil and Structural Engineering Open-channel flow
Zdroj:	Journal of Hydraulic Engineering. 124:179-185
ISSN:	1943-7900 0733-9429
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::10c56f2bc7b228305a5fc0ca459a448b https://doi.org/10.1061/(asce)0733-9429(1998)124:2(179) Zobrazit plný text záznamu