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Effect of air release height on the formation of sediment thermals in water / Bing Zhao in Journal of hydraulic research, Vol. 50 N° 5 (Septembre/Octobre 2012) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 50 N° 5 (Septembre/Octobre 2012) . - pp. 532-540 Titre : Effect of air release height on the formation of sediment thermals in water Type de document : texte imprimé Auteurs : Bing Zhao, Auteur ; Adrian W.K. Law, Auteur ; Adams, E. Eric, Auteur Année de publication : 2012 Article en page(s) : pp. 532-540 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Dredged  material  Miscible  thermal  Particle  cloud  Sediment  disposal  Virtual  origin Résumé : In this study, the underwater behaviour of sediment thermals (i.e. sediment clouds in the self-preserving phase), formed by releasing dry sediments instantaneously from various heights above water, was investigated experimentally. Measurements show that as the air release height increases, the initial acceleration phase of the sediment cloud in water is shortened, while the growth rate during its self-preserving phase remains constant. Therefore, the effect of air release height can be accounted for by utilizing a new concept of simultaneous virtual distance and time origins, which are found to be related to an impact densimetric Froude number (defined as the ratio between the impact velocity of the sediment cluster at the water surface and the characteristic velocity of the sediment thermal generated by buoyancy excess). Based on the measurement results, a semi-empirical model is utilized to predict the growth and penetration behaviours of the sediment thermal. Predictions by the model with the virtual origins correction match well with the experimental data. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2012.715094 [article] Effect of air release height on the formation of sediment thermals in water [texte imprimé] / Bing Zhao, Auteur ; Adrian W.K. Law, Auteur ; Adams, E. Eric, Auteur . - 2012 . - pp. 532-540. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 5 (Septembre/Octobre 2012) . - pp. 532-540 Mots-clés : Dredged  material  Miscible  thermal  Particle  cloud  Sediment  disposal  Virtual  origin Résumé : In this study, the underwater behaviour of sediment thermals (i.e. sediment clouds in the self-preserving phase), formed by releasing dry sediments instantaneously from various heights above water, was investigated experimentally. Measurements show that as the air release height increases, the initial acceleration phase of the sediment cloud in water is shortened, while the growth rate during its self-preserving phase remains constant. Therefore, the effect of air release height can be accounted for by utilizing a new concept of simultaneous virtual distance and time origins, which are found to be related to an impact densimetric Froude number (defined as the ratio between the impact velocity of the sediment cluster at the water surface and the characteristic velocity of the sediment thermal generated by buoyancy excess). Based on the measurement results, a semi-empirical model is utilized to predict the growth and penetration behaviours of the sediment thermal. Predictions by the model with the virtual origins correction match well with the experimental data. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2012.715094