Breaching of overtopped river embankments controlled by apparent cohesion / Gerd Pickert in Journal of hydraulic research, Vol. 49 N° 2 (Mars/Avril 2011)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 49 N° 2 (Mars/Avril 2011) . - pp. 143-156 Titre : Breaching of overtopped river embankments controlled by apparent cohesion Type de document : texte imprimé Auteurs : Gerd Pickert, Auteur ; Volker Weitbrecht, Auteur ; Andreas Bieberstein, Auteur Année de publication : 2011 Article en page(s) : pp. 143-156 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Breach formation Dam failure Embankment Fringe projection method Laboratory experiment Pore-water pressure 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 : Laboratory experiments were conducted to obtain detailed experimental data of high temporal and spatial resolution on the breach of homogeneous non-cohesive embankments due to overtopping. These results supplement earlier data for this embankment type by providing information on the breach discharge, longitudinal and transversal breach profiles, erosion rates and pore-water pressures within the embankment. Based on detailed experimental results, two breach phases are classified. Shear and tension failure mechanisms were identified from the analysis of the obtained cross-sectional breach profiles. Furthermore, the temporal cross-sectional analysis of the used non-cohesive granular material shows a different behaviour regarding the lateral breach widening and the breach slope failure. The data analysis indicates that the apparent cohesion represented by the pore-water pressure influences the stability of the breach side slopes and hence the complete breach process. This finding is confirmed by a dimensional analysis of the experimental data and compared with information from earlier work. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.552468 [article] Breaching of overtopped river embankments controlled by apparent cohesion [texte imprimé] / Gerd Pickert, Auteur ; Volker Weitbrecht, Auteur ; Andreas Bieberstein, Auteur . - 2011 . - pp. 143-156. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 2 (Mars/Avril 2011) . - pp. 143-156 Mots-clés : Breach formation Dam failure Embankment Fringe projection method Laboratory experiment Pore-water pressure 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 : Laboratory experiments were conducted to obtain detailed experimental data of high temporal and spatial resolution on the breach of homogeneous non-cohesive embankments due to overtopping. These results supplement earlier data for this embankment type by providing information on the breach discharge, longitudinal and transversal breach profiles, erosion rates and pore-water pressures within the embankment. Based on detailed experimental results, two breach phases are classified. Shear and tension failure mechanisms were identified from the analysis of the obtained cross-sectional breach profiles. Furthermore, the temporal cross-sectional analysis of the used non-cohesive granular material shows a different behaviour regarding the lateral breach widening and the breach slope failure. The data analysis indicates that the apparent cohesion represented by the pore-water pressure influences the stability of the breach side slopes and hence the complete breach process. This finding is confirmed by a dimensional analysis of the experimental data and compared with information from earlier work. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.552468

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