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Titre :
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Experimental observation of the flow structure of turbidity currents (2011)
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Auteurs :
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Zahra Nourmohammadi, Auteur ;
Hossein Afshin, Auteur ;
Bahar Firoozabadi, Auteur
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Type de document :
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Article : texte imprimé
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Dans :
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Journal of hydraulic research (Vol. 49 N° 2, Mars/Avril 2011)
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Article en page(s) :
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pp. 168-177
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Note générale :
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Hydraulique
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Langues :
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Anglais
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Index. décimale :
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627 (Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques)
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Tags :
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Froude number Hydraulic jump Sediment-laden density current Turbidity Velocity profile
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Résumé :
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The structure of turbidity currents released on a sloping bed below fresh water is investigated. Kaolin is used as a suspended material. Laboratory observations indicate that if a dense layer moves through the channel, the current thickness increases due to a hydraulic jump. This phenomenon occurs under special inlet conditions and has a significant effect on the current structure including velocity profile, current height and bed shear stress. Flows with different inlet Froude numbers based on various inlet concentrations behave more distinctly than those based on different inlet opening heights. Laboratory experiments indicate that an increase in the inlet Froude number causes an increase in the height of sediment-laden density currents and a decrease in the maximum cross-sectional velocity. The effects of the hydraulic jump on the bed shear stress are also investigated. A decrease in this stress and the average velocity is remarkable after the current has passed the jump.
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DEWEY :
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627
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ISSN :
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0022-1686
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En ligne :
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http://www.tandfonline.com/doi/abs/10.1080/00221686.2010.543777
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