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On equivalent roughness of mobile bed at high shear stress
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SYSNO ASEP 0328720 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název On equivalent roughness of mobile bed at high shear stress Tvůrce(i) Matoušek, Václav (UH-J) ORCID, SAI, RID
Krupička, Jan (UH-J) SAI, RIDZdroj.dok. Journal of Hydrology and Hydromechanics. - : Ústav pro hydromechaniku AV ČR, v. v. i.. - : Ústav hydrológie SAV - ISSN 0042-790X
Roč. 57, č. 3 (2009), s. 191-199Poč.str. 9 s. Forma vydání on-line - on-line Jazyk dok. eng - angličtina Země vyd. SK - Slovensko Klíč. slova bed shear ; experiment ; hydraulic transport ; sediment transport Vědní obor RIV BK - Mechanika tekutin CEP GA103/06/0428 GA ČR - Grantová agentura ČR CEZ AV0Z20600510 - UH-J (2005-2011) UT WOS 000268906900006 DOI 10.2478/v10098-009-0018-9 Anotace The friction conditions at the top of a mobile bed are discussed for flows in the upper-plane-bed regime, i.e. for the flows with values of the bed Shields parameter larger than approximately 0.6. A special attention is devoted to flows of the bed Shields parameter bigger than 2. Experimental data for flows at high bed shear are collected from literature and new data are added from own measurements of flows of a 1.36-mm sand slurry in the 100-mm pipe loop of the Institute of Hydrodynamics. The paper analyses the data in order to evaluate a relationship among the equivalent roughness of the top of the bed and other relevant parameters. A semi-empirical formula is proposed that relates the equivalent roughness to the bed Shields parameter, the ratio of flow velocity and particle settling velocity, and the ratio of flow hydraulic radius and particle diameter. The formula is applicable primarily to flows of combined load (contact- and suspended loads together). Pracoviště Ústav pro hydrodynamiku Kontakt Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Rok sběru 2010
Počet záznamů: 1