Documents disponibles écrits par cet auteur

Effect of a vegetation patch on turbulent channel flow / Dimitris Souliotis in Journal of hydraulic research, Vol. 49 N° 2 (Mars/Avril 2011) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 49 N° 2 (Mars/Avril 2011) . - pp. 157-167 Titre : Effect of a vegetation patch on turbulent channel flow Type de document : texte imprimé Auteurs : Dimitris Souliotis, Auteur ; Panayotis Prinos, Auteur Année de publication : 2011 Article en page(s) : pp. 157-167 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Bed  shear  stress  Flow  characteristics  Open  channel  Turbulence  model  Vegetation  patch 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 : The effect of a vegetation patch (VP) on the flow and turbulence characteristics is studied. Two turbulence models are used to simulate patch presence. Numerical results for both mean and turbulence flow characteristics are compared with available measurements to assess the performance of these models for dense and sparse submerged VPs. The mechanisms which control the turbulent development inside the VP are also discussed, and the patch effect on the downstream flow and turbulence is assessed. The results indicate that the patch length and the vegetation density dominate the turbulent development. An increase in the vegetation density causes acceleration of the development of flow velocity and turbulence characteristics inside the patch and increases the channel length downstream of the patch where its effect is significant. Also areas with increased and decreased values of bed shear stresses are observed at the initial part and at the end of the patch, respectively. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.557258 [article] Effect of a vegetation patch on turbulent channel flow [texte imprimé] / Dimitris Souliotis, Auteur ; Panayotis Prinos, Auteur . - 2011 . - pp. 157-167. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 2 (Mars/Avril 2011) . - pp. 157-167 Mots-clés : Bed  shear  stress  Flow  characteristics  Open  channel  Turbulence  model  Vegetation  patch 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 : The effect of a vegetation patch (VP) on the flow and turbulence characteristics is studied. Two turbulence models are used to simulate patch presence. Numerical results for both mean and turbulence flow characteristics are compared with available measurements to assess the performance of these models for dense and sparse submerged VPs. The mechanisms which control the turbulent development inside the VP are also discussed, and the patch effect on the downstream flow and turbulence is assessed. The results indicate that the patch length and the vegetation density dominate the turbulent development. An increase in the vegetation density causes acceleration of the development of flow velocity and turbulence characteristics inside the patch and increases the channel length downstream of the patch where its effect is significant. Also areas with increased and decreased values of bed shear stresses are observed at the initial part and at the end of the patch, respectively. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.557258

Large-scale experiments on wave propagation over Posidonia oceanica / Vasiliki Stratigaki in Journal of hydraulic research, Vol. 49 Supplément 1 (2011) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 49 Supplément 1 (2011) . - pp. 31-43 Titre : Large-scale experiments on wave propagation over Posidonia oceanica Type de document : texte imprimé Auteurs : Vasiliki Stratigaki, Auteur ; Eleonora Manca, Auteur ; Panayotis Prinos, Auteur Année de publication : 2012 Article en page(s) : pp. 31-43 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Artificial  seagrass  Artificial  vegetation  Large-scale  experiment  Posidonia  oceanica  Wave  attenuation  Wave–seagrass  interaction 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 : Posidonia oceanica, the most abundant seagrass species in the Mediterranean, supports a highly bio-diverse habitat and is crucial in protecting against coastal erosion. In this work, experiments in a large-scale facility have been performed, for the measurement of wave attenuation, transmission and energy dissipation over artificial Posidonia oceanica. The effects of submergence ratio corresponding to the seagrass height divided by water depth, and seagrass density as the number of stems per square metre on the above characteristics are investigated. Measurements of wave height at different locations along the vegetation meadow indicate the wave attenuation along the Posidonia oceanica for three different submergence ratios and two seagrass densities. Results are also analysed with regard to the wave-induced flow within the meadow, and the effects of the submergence ratio and the seagrass density on the mean flow characteristics, based on data of mean velocities taken at three locations within the seagrass. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.583388 [article] Large-scale experiments on wave propagation over Posidonia oceanica [texte imprimé] / Vasiliki Stratigaki, Auteur ; Eleonora Manca, Auteur ; Panayotis Prinos, Auteur . - 2012 . - pp. 31-43. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 Supplément 1 (2011) . - pp. 31-43 Mots-clés : Artificial  seagrass  Artificial  vegetation  Large-scale  experiment  Posidonia  oceanica  Wave  attenuation  Wave–seagrass  interaction 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 : Posidonia oceanica, the most abundant seagrass species in the Mediterranean, supports a highly bio-diverse habitat and is crucial in protecting against coastal erosion. In this work, experiments in a large-scale facility have been performed, for the measurement of wave attenuation, transmission and energy dissipation over artificial Posidonia oceanica. The effects of submergence ratio corresponding to the seagrass height divided by water depth, and seagrass density as the number of stems per square metre on the above characteristics are investigated. Measurements of wave height at different locations along the vegetation meadow indicate the wave attenuation along the Posidonia oceanica for three different submergence ratios and two seagrass densities. Results are also analysed with regard to the wave-induced flow within the meadow, and the effects of the submergence ratio and the seagrass density on the mean flow characteristics, based on data of mean velocities taken at three locations within the seagrass. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.583388