Documents disponibles écrits par cet auteur

Local scour at a trapezoidal abutment: sediment motion pattern / Alessio Radice in Journal of hydraulic research, Vol. 47 N° 2+ Supplément (Mars/Avril 2009) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 47 N° 2+ Supplément (Mars/Avril 2009) . - pp. 250-262 Titre : Local scour at a trapezoidal abutment: sediment motion pattern Titre original : Affouillement local au droit d'une butée trapézoïdale: comportement du sédiment Type de document : texte imprimé Auteurs : Alessio Radice, Auteur ; Francesco Ballio, Auteur ; Giovanni Porta, Auteur Année de publication : 2009 Article en page(s) : pp. 250-262 Note générale : Hydraulique Résumé en Français Langues : Anglais (eng) Mots-clés : Laboratory  model  Local  scour  Scour  development  Sediment  concentration  Sediment  velocity  Solid  discharge  Trapezoidal  abutment  Vortical  structures Index. décimale : 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 Résumé : Results for a local scour experiment are presented where the sediment motion was measured around a trapezoidal abutment. The experiment was performed in clear-water conditions. The sediment fluxes were evaluated by measuring the concentration and the velocity of the moving particles. Various evolution stages were considered, from the start of the experiment to a scour depth of almost twice the abutment length, with particular focus on the temporal and spatial evolution of the sediment kinematics. The results are then compared systematically with literature studies on the vertical flow field around trapezoidal abutments, to verify the consistency between the observed liquid and solid phase motion fields in a local scour process. The findings may support phenomenological analysis of the erosion process and numerical modeling of the temporal development of the scour depth at a trapezoidal abutment. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com [article] Local scour at a trapezoidal abutment: sediment motion pattern = Affouillement local au droit d'une butée trapézoïdale: comportement du sédiment [texte imprimé] / Alessio Radice, Auteur ; Francesco Ballio, Auteur ; Giovanni Porta, Auteur . - 2009 . - pp. 250-262. Hydraulique Résumé en Français Langues : Anglais (eng) in Journal of hydraulic research > Vol. 47 N° 2+ Supplément (Mars/Avril 2009) . - pp. 250-262 Mots-clés : Laboratory  model  Local  scour  Scour  development  Sediment  concentration  Sediment  velocity  Solid  discharge  Trapezoidal  abutment  Vortical  structures Index. décimale : 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 Résumé : Results for a local scour experiment are presented where the sediment motion was measured around a trapezoidal abutment. The experiment was performed in clear-water conditions. The sediment fluxes were evaluated by measuring the concentration and the velocity of the moving particles. Various evolution stages were considered, from the start of the experiment to a scour depth of almost twice the abutment length, with particular focus on the temporal and spatial evolution of the sediment kinematics. The results are then compared systematically with literature studies on the vertical flow field around trapezoidal abutments, to verify the consistency between the observed liquid and solid phase motion fields in a local scour process. The findings may support phenomenological analysis of the erosion process and numerical modeling of the temporal development of the scour depth at a trapezoidal abutment. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com

Study of sediment motion in scour hole of a circular pier / Alessio Radice in Journal of hydraulic research, Vol. 50 N° 1 (Janvier/Février 2012) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 50 N° 1 (Janvier/Février 2012) . - pp. 44-51 Titre : Study of sediment motion in scour hole of a circular pier Type de document : texte imprimé Auteurs : Alessio Radice, Auteur ; Chau K. Tran, Auteur Année de publication : 2012 Article en page(s) : pp. 44-51 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Bridge  pier  Local  scour  Pier–abutment  comparison  Sediment  kinematics Résumé : This research presents results for the sediment kinematics in a clear-water scour experiment with a circular pier. Various process phases were considered, until the scour depth equalled almost twice the pier diameter. The results are consistent with typical literature descriptions of the flow field and with the findings of few previous works where the sediment motion at a local scour was investigated. The relationship between the time-averaged concentration and velocity of sediments in the scour hole was found to be almost space- and time-invariant. In addition, the link was analogous to those found in an earlier work on abutments, providing for the first time evidence that the transport mechanics are identical for the two obstacle types. It is therefore suggested that the present results support the phenomenological description and modelling of various local scour processes. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.641764 [article] Study of sediment motion in scour hole of a circular pier [texte imprimé] / Alessio Radice, Auteur ; Chau K. Tran, Auteur . - 2012 . - pp. 44-51. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 1 (Janvier/Février 2012) . - pp. 44-51 Mots-clés : Bridge  pier  Local  scour  Pier–abutment  comparison  Sediment  kinematics Résumé : This research presents results for the sediment kinematics in a clear-water scour experiment with a circular pier. Various process phases were considered, until the scour depth equalled almost twice the pier diameter. The results are consistent with typical literature descriptions of the flow field and with the findings of few previous works where the sediment motion at a local scour was investigated. The relationship between the time-averaged concentration and velocity of sediments in the scour hole was found to be almost space- and time-invariant. In addition, the link was analogous to those found in an earlier work on abutments, providing for the first time evidence that the transport mechanics are identical for the two obstacle types. It is therefore suggested that the present results support the phenomenological description and modelling of various local scour processes. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.641764