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Temporal variation of vortex scour process around caisson piers / Gangarudraiah Veerappadevaru in Journal of hydraulic research, Vol. 50 N° 2 (Mars/Avril 2012) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 50 N° 2 (Mars/Avril 2012) . - pp. 200-207 Titre : Temporal variation of vortex scour process around caisson piers Type de document : texte imprimé Auteurs : Gangarudraiah Veerappadevaru, Auteur ; Thimmaiah Gangadharaiah, Auteur ; Thirumalai Ramaswamyiyenger Jagadeesh, Auteur Année de publication : 2012 Article en page(s) : pp. 200-207 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Bridge  pier  Caisson  Power  concept  River  engineering  Scour  Vortex Résumé : The concept of conservation of power during scour by the primary vortex formed in front of caisson piers is used to develop a relation for the temporal of scour depth variation. To test this relation, experiments were conducted using two sediment beds, three types of caisson piers and four relative flow depths. The agreement between the temporal variation of scour depths from the present approach and the literature data is good. The computed values of other researchers also agree fairly with the present proportionality constants. An expression for scour duration to reach the equilibrium scour depth is deduced from the power concept based on long duration literature data. The validity of this expression is verified for the equilibrium duration concept. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2012.666832 [article] Temporal variation of vortex scour process around caisson piers [texte imprimé] / Gangarudraiah Veerappadevaru, Auteur ; Thimmaiah Gangadharaiah, Auteur ; Thirumalai Ramaswamyiyenger Jagadeesh, Auteur . - 2012 . - pp. 200-207. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 2 (Mars/Avril 2012) . - pp. 200-207 Mots-clés : Bridge  pier  Caisson  Power  concept  River  engineering  Scour  Vortex Résumé : The concept of conservation of power during scour by the primary vortex formed in front of caisson piers is used to develop a relation for the temporal of scour depth variation. To test this relation, experiments were conducted using two sediment beds, three types of caisson piers and four relative flow depths. The agreement between the temporal variation of scour depths from the present approach and the literature data is good. The computed values of other researchers also agree fairly with the present proportionality constants. An expression for scour duration to reach the equilibrium scour depth is deduced from the power concept based on long duration literature data. The validity of this expression is verified for the equilibrium duration concept. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2012.666832

Vortex scouring process around bridge pier with a caisson / Gangarudraiah Veerappadevaru in Journal of hydraulic research, Vol. 49 N° 3 (Mai/Juin 2011) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 49 N° 3 (Mai/Juin 2011) . - pp. 378-383 Titre : Vortex scouring process around bridge pier with a caisson Type de document : texte imprimé Auteurs : Gangarudraiah Veerappadevaru, Auteur ; Thimmaiah Gangadharaiah, Auteur ; Thirumalai Ramaswamyiyenger, Auteur Année de publication : 2011 Article en page(s) : pp. 378-383 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Caisson  bridge  pier  Power  concept  Scour  Vortex 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 : An experimental investigation to predict the characteristics of scour vortices related to the scour depth of caisson piers was conducted. Two median size sediments were used as bed materials. Three types of piers, namely a cylindrical pier, a cylindrical pier with a caisson, and a nose pier were considered. The size and the rotational speed of the primary vortex were measured and correlated to the flow and pier parameters. The vortex power available to scour the sediment is related to the power provided by the vortex in the scour process. The equilibrium scour depth was predicted based on the concept of power available in the primary scour vortex equal to the resisting power of sediment in the scour hole. The prediction of the scour depth agrees well with literature data. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.568195 [article] Vortex scouring process around bridge pier with a caisson [texte imprimé] / Gangarudraiah Veerappadevaru, Auteur ; Thimmaiah Gangadharaiah, Auteur ; Thirumalai Ramaswamyiyenger, Auteur . - 2011 . - pp. 378-383. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 3 (Mai/Juin 2011) . - pp. 378-383 Mots-clés : Caisson  bridge  pier  Power  concept  Scour  Vortex 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 : An experimental investigation to predict the characteristics of scour vortices related to the scour depth of caisson piers was conducted. Two median size sediments were used as bed materials. Three types of piers, namely a cylindrical pier, a cylindrical pier with a caisson, and a nose pier were considered. The size and the rotational speed of the primary vortex were measured and correlated to the flow and pier parameters. The vortex power available to scour the sediment is related to the power provided by the vortex in the scour process. The equilibrium scour depth was predicted based on the concept of power available in the primary scour vortex equal to the resisting power of sediment in the scour hole. The prediction of the scour depth agrees well with literature data. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.568195