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Ajouter le résultat dans votre panierThe journal of hydraulic research 1963–2012 / Willi H. Hager in Journal of hydraulic research, Vol. 50 N° 3 (Mai/Juin 2012)
Titre : The journal of hydraulic research 1963–2012 : Advances over the past 50 years Type de document : texte imprimé Auteurs : Willi H. Hager, Auteur Année de publication : 2012 Article en page(s) : pp. 256-261 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : History Hydraulics IAHR Journal of Hydraulic Research Résumé : The Journal of Hydraulic Research (JHR) reaches in 2012 the 50th publication year, so that an adequate look back is appropriate. This paper describes the foundations of both the International Association of Hydro-environment Engineering and Research (IAHR) and its flagship journal JHR. The latter was a significant addition to the then existing hydraulic engineering research journals, and it was well received particularly among the IAHR members. The development of JHR is described in terms of the journal presentation, the editors and the 10 top-cited papers. It is noted that papers mainly with a computational background and with problems in river engineering count in these seminal works. The paper closes with remarks from the author relating to his observations made during the past 5 years while serving as the JHR editor. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.697078
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 256-261[article] The journal of hydraulic research 1963–2012 : Advances over the past 50 years [texte imprimé] / Willi H. Hager, Auteur . - 2012 . - pp. 256-261.
Hydraulique
Langues : Anglais (eng)
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 256-261
Mots-clés : History Hydraulics IAHR Journal of Hydraulic Research Résumé : The Journal of Hydraulic Research (JHR) reaches in 2012 the 50th publication year, so that an adequate look back is appropriate. This paper describes the foundations of both the International Association of Hydro-environment Engineering and Research (IAHR) and its flagship journal JHR. The latter was a significant addition to the then existing hydraulic engineering research journals, and it was well received particularly among the IAHR members. The development of JHR is described in terms of the journal presentation, the editors and the 10 top-cited papers. It is noted that papers mainly with a computational background and with problems in river engineering count in these seminal works. The paper closes with remarks from the author relating to his observations made during the past 5 years while serving as the JHR editor. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.697078 Exemplaires
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Titre : Hydrodynamics of vegetated channels Type de document : texte imprimé Auteurs : Heidi M. Nepf, Auteur Année de publication : 2012 Article en page(s) : pp. 262-279 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Blade boundary layer Channel resistance Sediment transport Turbulence Vegetation Résumé : This paper highlights some recent trends in vegetation hydrodynamics, focusing on conditions within channels and spanning spatial scales from individual blades, to canopies or vegetation patches, to the channel reach. At the blade scale, the boundary layer formed on the plant surface plays a role in controlling nutrient uptake. Flow resistance and light availability are also influenced by the reconfiguration of flexible blades. At the canopy scale, there are two flow regimes. For sparse canopies, the flow resembles a rough boundary layer. For dense canopies, the flow resembles a mixing layer. At the reach scale, flow resistance is more closely connected to the patch-scale vegetation distribution, described by the blockage factor, than to the geometry of individual plants. The impact of vegetation distribution on sediment movement is discussed, with attention being paid to methods for estimating bed stress within regions of vegetation. The key research challenges of the hydrodynamics of vegetated channels are highlighted. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.696559
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 262-279[article] Hydrodynamics of vegetated channels [texte imprimé] / Heidi M. Nepf, Auteur . - 2012 . - pp. 262-279.
Hydraulique
Langues : Anglais (eng)
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 262-279
Mots-clés : Blade boundary layer Channel resistance Sediment transport Turbulence Vegetation Résumé : This paper highlights some recent trends in vegetation hydrodynamics, focusing on conditions within channels and spanning spatial scales from individual blades, to canopies or vegetation patches, to the channel reach. At the blade scale, the boundary layer formed on the plant surface plays a role in controlling nutrient uptake. Flow resistance and light availability are also influenced by the reconfiguration of flexible blades. At the canopy scale, there are two flow regimes. For sparse canopies, the flow resembles a rough boundary layer. For dense canopies, the flow resembles a mixing layer. At the reach scale, flow resistance is more closely connected to the patch-scale vegetation distribution, described by the blockage factor, than to the geometry of individual plants. The impact of vegetation distribution on sediment movement is discussed, with attention being paid to methods for estimating bed stress within regions of vegetation. The key research challenges of the hydrodynamics of vegetated channels are highlighted. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.696559 Exemplaires
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Titre : Turbulent, discontinuous, open-channel flow : The contribution of Ralph Schröder Type de document : texte imprimé Auteurs : Oscar Castro-Orgaz, Auteur ; Willi H. Hager, Auteur Année de publication : 2012 Article en page(s) : pp. 280-289 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Hydraulic jump Hydraulics Open-channel flow Separation Turbulent Résumé : Turbulent discontinuous open-channel flow appears in practice due to separation zones. The current practice overlooks the separation bubble by neglecting its velocity and by assuming static pressure on the active main stream. Based on the pioneering and so far unique work of Ralph Schröder, this approximation is compared with detailed computations of the energy and momentum velocity coefficients using his selected experiments. What would occur if their magnitude were 200 and 40 times greater than standard values? These extremes are demonstrated to occur and used to critically asses the “static bubble” approximation of roller flows. The data were also used to present generalized computations of the critical depth based on the energy and momentum equations, thereby proving that these differ in turbulent open-channel flow, although they are identical for potential flow. All these findings emerge from the outstanding experimental work of Schröder, which is critically reviewed to make his achievements available for the hydraulic community. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.686201
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 280-289[article] Turbulent, discontinuous, open-channel flow : The contribution of Ralph Schröder [texte imprimé] / Oscar Castro-Orgaz, Auteur ; Willi H. Hager, Auteur . - 2012 . - pp. 280-289.
Hydraulique
Langues : Anglais (eng)
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 280-289
Mots-clés : Hydraulic jump Hydraulics Open-channel flow Separation Turbulent Résumé : Turbulent discontinuous open-channel flow appears in practice due to separation zones. The current practice overlooks the separation bubble by neglecting its velocity and by assuming static pressure on the active main stream. Based on the pioneering and so far unique work of Ralph Schröder, this approximation is compared with detailed computations of the energy and momentum velocity coefficients using his selected experiments. What would occur if their magnitude were 200 and 40 times greater than standard values? These extremes are demonstrated to occur and used to critically asses the “static bubble” approximation of roller flows. The data were also used to present generalized computations of the critical depth based on the energy and momentum equations, thereby proving that these differ in turbulent open-channel flow, although they are identical for potential flow. All these findings emerge from the outstanding experimental work of Schröder, which is critically reviewed to make his achievements available for the hydraulic community. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.686201 Exemplaires
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Titre : Stilling basin erosion due to vertical crossing jets Type de document : texte imprimé Auteurs : Pagliara, Stefano, Auteur ; Michele Palermo, Auteur ; Dipankar Roy, Auteur Année de publication : 2012 Article en page(s) : pp. 290-297 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Plunge pool Scour Spillway Tailwater Vertical crossing jet Résumé : The scour process due to plunging jets has received considerable attention in the past few decades. This work analyses the effect of vertical jets crossing at various angles. Different scour morphologies created under various hydraulic and geometrical conditions are distinguished. The splash shapes are also analysed and a qualitative description is furnished. The scour phenomenon is analysed, resulting in relationships that can be used to predict the main geometrical scour parameters, including the maximum scour hole depth, the scour hole length, and the scour hole width. The scour hole and dune profiles are compared with those due to a single jet under identical hydraulic conditions, whose vertical inclination with respect to the horizontal plane equals the average vertical angle between the two crossing jets. It was found that for high tailwater condition, the scour hole depth due to crossing jets is less than that for the single jet. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.669534
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 290-297[article] Stilling basin erosion due to vertical crossing jets [texte imprimé] / Pagliara, Stefano, Auteur ; Michele Palermo, Auteur ; Dipankar Roy, Auteur . - 2012 . - pp. 290-297.
Hydraulique
Langues : Anglais (eng)
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 290-297
Mots-clés : Plunge pool Scour Spillway Tailwater Vertical crossing jet Résumé : The scour process due to plunging jets has received considerable attention in the past few decades. This work analyses the effect of vertical jets crossing at various angles. Different scour morphologies created under various hydraulic and geometrical conditions are distinguished. The splash shapes are also analysed and a qualitative description is furnished. The scour phenomenon is analysed, resulting in relationships that can be used to predict the main geometrical scour parameters, including the maximum scour hole depth, the scour hole length, and the scour hole width. The scour hole and dune profiles are compared with those due to a single jet under identical hydraulic conditions, whose vertical inclination with respect to the horizontal plane equals the average vertical angle between the two crossing jets. It was found that for high tailwater condition, the scour hole depth due to crossing jets is less than that for the single jet. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.669534 Exemplaires
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Titre : Effects of hydraulic jump location on air entrainment in closed conduits Type de document : texte imprimé Auteurs : Joshua D. Mortensen, Auteur ; Steven L. Barfuss, Auteur ; Blake P. Tullis, Auteur Année de publication : 2012 Article en page(s) : pp. 298-303 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Air entrainment Characteristic length Closed conduit Hydraulic jump Location effect Résumé : In vented closed conduit conveyance systems, air entrained through hydraulic jumps can be problematic for system operation. While various factors influencing air entrainment have been reported in the literature, no specific attention has been paid to the hydraulic jump location relative to the point of downstream air release. To better understand the effects of jump location on air entrainment, in this study, experiments were conducted in a vented, circular conduit with variable hydraulic jump locations relative to the pipe outlet. When the hydraulic jump was fully contained within the pipe, the air entrainment rate was dependent on the Froude number immediately upstream of the jump but was independent of the jump location within the pipe. The rate of air entrainment significantly increased, however, when the hydraulic jump was not fully contained within the pipe. For this condition, the distance from the toe of the jump to the pipe outlet significantly influences the air entrainment rate. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.670008
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 298-303[article] Effects of hydraulic jump location on air entrainment in closed conduits [texte imprimé] / Joshua D. Mortensen, Auteur ; Steven L. Barfuss, Auteur ; Blake P. Tullis, Auteur . - 2012 . - pp. 298-303.
Hydraulique
Langues : Anglais (eng)
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 298-303
Mots-clés : Air entrainment Characteristic length Closed conduit Hydraulic jump Location effect Résumé : In vented closed conduit conveyance systems, air entrained through hydraulic jumps can be problematic for system operation. While various factors influencing air entrainment have been reported in the literature, no specific attention has been paid to the hydraulic jump location relative to the point of downstream air release. To better understand the effects of jump location on air entrainment, in this study, experiments were conducted in a vented, circular conduit with variable hydraulic jump locations relative to the pipe outlet. When the hydraulic jump was fully contained within the pipe, the air entrainment rate was dependent on the Froude number immediately upstream of the jump but was independent of the jump location within the pipe. The rate of air entrainment significantly increased, however, when the hydraulic jump was not fully contained within the pipe. For this condition, the distance from the toe of the jump to the pipe outlet significantly influences the air entrainment rate. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.670008 Exemplaires
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Titre : Velocity profiles and friction coefficients in circular open channels Type de document : texte imprimé Auteurs : Ji-In Yoon, Auteur ; Jaeyong Sung, Auteur ; Myeong Ho Lee, Auteur Année de publication : 2012 Article en page(s) : pp. 304-311 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Chézy equation Circular open channel Friction coefficient Manning Stereoscopic PIV Velocity distribution function Résumé : Velocity distributions and friction coefficients in a circular open channel have been investigated experimentally. To measure three-dimensional velocity components, a stereoscopic particle image velocimetry system was used. Based on the measured data, velocity distributions and wall friction coefficients were obtained using the non-linear least-squares fitting method. Unlike in rectangular channels, the velocity distribution varies significantly since the side walls affect the flow in a different manner as the flow depth changes. The present experimental data exhibit different characteristics whether the flow depth is higher or lower than 50% of the pipe diameter. The main effect of the flow depth on the velocity distribution is the ratio of mean to maximum velocities and the position of maximum velocity. Both values reduce if the flow depth is below 50%. Wall friction and Manning coefficients also differ from the generally estimated values as the flow depth is reduced by 50%. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.673745
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 304-311[article] Velocity profiles and friction coefficients in circular open channels [texte imprimé] / Ji-In Yoon, Auteur ; Jaeyong Sung, Auteur ; Myeong Ho Lee, Auteur . - 2012 . - pp. 304-311.
Hydraulique
Langues : Anglais (eng)
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 304-311
Mots-clés : Chézy equation Circular open channel Friction coefficient Manning Stereoscopic PIV Velocity distribution function Résumé : Velocity distributions and friction coefficients in a circular open channel have been investigated experimentally. To measure three-dimensional velocity components, a stereoscopic particle image velocimetry system was used. Based on the measured data, velocity distributions and wall friction coefficients were obtained using the non-linear least-squares fitting method. Unlike in rectangular channels, the velocity distribution varies significantly since the side walls affect the flow in a different manner as the flow depth changes. The present experimental data exhibit different characteristics whether the flow depth is higher or lower than 50% of the pipe diameter. The main effect of the flow depth on the velocity distribution is the ratio of mean to maximum velocities and the position of maximum velocity. Both values reduce if the flow depth is below 50%. Wall friction and Manning coefficients also differ from the generally estimated values as the flow depth is reduced by 50%. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.673745 Exemplaires
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Titre : Three-phase bi-layer model for simulating mixed flows Type de document : texte imprimé Auteurs : François Kerger, Auteur ; Pierre Archambeau, Auteur ; Benjamin J. Dewals, Auteur Année de publication : 2012 Article en page(s) : pp. 312-319 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Air entrapment entrainment Air–water flow Drift-flux model Multiphase Résumé : Mixed flows characterized by a simultaneous occurrence of free surface and pressurized flows are often encountered in hydraulic engineering. Numerous researches have been dedicated to unify the mathematical description of both flows. Herein, shock-capturing models succeed in giving a unique set of equations. However, no method accounts for both air-entrapment and air-entrainment. This study proposes an original model to simulate air–water interactions in mixed flows. The new approach relies on the area-integration of a three-phase model over two layers. The applicability of this free surface model is extended to pressurized flows by a modified pressure term accounting for the dispersed air. The derived modelling system WOLF IMPack is then validated. The code successfully simulates open channel flows, mixed flows and water hammer in a unified framework, including air–water interactions, in structures like the drainage network. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.684454
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 312-319[article] Three-phase bi-layer model for simulating mixed flows [texte imprimé] / François Kerger, Auteur ; Pierre Archambeau, Auteur ; Benjamin J. Dewals, Auteur . - 2012 . - pp. 312-319.
Hydraulique
Langues : Anglais (eng)
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 312-319
Mots-clés : Air entrapment entrainment Air–water flow Drift-flux model Multiphase Résumé : Mixed flows characterized by a simultaneous occurrence of free surface and pressurized flows are often encountered in hydraulic engineering. Numerous researches have been dedicated to unify the mathematical description of both flows. Herein, shock-capturing models succeed in giving a unique set of equations. However, no method accounts for both air-entrapment and air-entrainment. This study proposes an original model to simulate air–water interactions in mixed flows. The new approach relies on the area-integration of a three-phase model over two layers. The applicability of this free surface model is extended to pressurized flows by a modified pressure term accounting for the dispersed air. The derived modelling system WOLF IMPack is then validated. The code successfully simulates open channel flows, mixed flows and water hammer in a unified framework, including air–water interactions, in structures like the drainage network. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.684454 Exemplaires
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Titre : Streambank shear stress estimates using turbulent kinetic energy Type de document : texte imprimé Auteurs : Leslie Hopkinson, Auteur ; Theresa Wynn-Thompson, Auteur Année de publication : 2012 Article en page(s) : pp. 320-323 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Boundary shear stress Reynolds Turbulent flow kinetic energy Vegetation Résumé : In tidal environments, the boundary shear stress (BSS) is directly proportional to the turbulent kinetic energy, with a reported proportionality coefficient of 0.19. This coefficient was calculated using velocity time series to determine Reynolds stresses and, ultimately, to estimate the BSS. The coefficient has not been evaluated using direct measurements of BSS or for environments other than tidal systems. This laboratory flume study examines the validity of this relationship for a sloping streambank with and without vegetation. BSSs and near-bank Reynolds stresses were calculated using a constant temperature anemometer and velocity measurements, respectively. The coefficient ranged from 0.11 to 0.53 when calculated with the measured values of BSS, and 0.09 to 0.37 when calculated with Reynolds stresses. The variation was attributed to differences in turbulence generation, coefficient development, and instrumentation. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.684771
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 320-323[article] Streambank shear stress estimates using turbulent kinetic energy [texte imprimé] / Leslie Hopkinson, Auteur ; Theresa Wynn-Thompson, Auteur . - 2012 . - pp. 320-323.
Hydraulique
Langues : Anglais (eng)
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 320-323
Mots-clés : Boundary shear stress Reynolds Turbulent flow kinetic energy Vegetation Résumé : In tidal environments, the boundary shear stress (BSS) is directly proportional to the turbulent kinetic energy, with a reported proportionality coefficient of 0.19. This coefficient was calculated using velocity time series to determine Reynolds stresses and, ultimately, to estimate the BSS. The coefficient has not been evaluated using direct measurements of BSS or for environments other than tidal systems. This laboratory flume study examines the validity of this relationship for a sloping streambank with and without vegetation. BSSs and near-bank Reynolds stresses were calculated using a constant temperature anemometer and velocity measurements, respectively. The coefficient ranged from 0.11 to 0.53 when calculated with the measured values of BSS, and 0.09 to 0.37 when calculated with Reynolds stresses. The variation was attributed to differences in turbulence generation, coefficient development, and instrumentation. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.684771 Exemplaires
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Titre : Transport of isotropic particles in a partially obstructed channel flow Type de document : texte imprimé Auteurs : Antoine Joly, Auteur ; Violeau, Damien, Auteur ; Frederic Moulin, Auteur Année de publication : 2012 Article en page(s) : pp. 324-337 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Lagrangian model Partially obstructed channel Particle diffusion Stochastic transport Video particle tracking Résumé : The transport of particles in turbulent flows is a common problem in hydraulic engineering. In this paper, the focus is set on a numerical model used to simulate the transport of small bodies (debris, algae, etc.) along a coastline. In this problem, the particles are larger than the small turbulent eddies, but smaller than the large turbulent eddies, and sufficiently diluted within the flow so that each particle does not affect the flow or the motion of other particles. A mixed Eulerian–Lagrangian approach was chosen in order to model a large flow area with sufficient information for the turbulent diffusion. This model is validated through an experiment on particles released into a partially obstructed channel flow. The measurements are then compared with simulations using two Eulerian industrial codes, Telemac-2D and OpenFoam. Finally, an application to algae bloom transport in a harbour is presented. En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.686457
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 324-337[article] Transport of isotropic particles in a partially obstructed channel flow [texte imprimé] / Antoine Joly, Auteur ; Violeau, Damien, Auteur ; Frederic Moulin, Auteur . - 2012 . - pp. 324-337.
Hydraulique
Langues : Anglais (eng)
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 324-337
Mots-clés : Lagrangian model Partially obstructed channel Particle diffusion Stochastic transport Video particle tracking Résumé : The transport of particles in turbulent flows is a common problem in hydraulic engineering. In this paper, the focus is set on a numerical model used to simulate the transport of small bodies (debris, algae, etc.) along a coastline. In this problem, the particles are larger than the small turbulent eddies, but smaller than the large turbulent eddies, and sufficiently diluted within the flow so that each particle does not affect the flow or the motion of other particles. A mixed Eulerian–Lagrangian approach was chosen in order to model a large flow area with sufficient information for the turbulent diffusion. This model is validated through an experiment on particles released into a partially obstructed channel flow. The measurements are then compared with simulations using two Eulerian industrial codes, Telemac-2D and OpenFoam. Finally, an application to algae bloom transport in a harbour is presented. En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.686457 Exemplaires
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Titre : Artificial stationary breaking surf waves in a physical and numerical model Type de document : texte imprimé Auteurs : Mario Oertel, Auteur ; Jan Mönkemöller, Auteur ; Andreas Schlenkhoff, Auteur Année de publication : 2012 Article en page(s) : pp. 338-343 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Artificial stationary surf wave Breaking Numerical model Physical Tube length VOF Résumé : Surfing is one of the most popular water sports. A number of regional coastal hotspots have naturally breaking surf waves, but wave heights and breaking processes depend on various boundary conditions like seabed geometry, beach formation and swell direction. Since the optimum combination of these conditions is rare in time and place, the formation of surfable waves cannot be guaranteed. In addition, the sport's popularity is currently rising even in inland regions, and with it the interest in generating artificial surf waves in rivers or technical constructions to provide surfable waves at any time and place. This research focuses on small-scale surf waves in a physical and numerical model to identify easy-to-handle geometries and to validate numerical simulations as a low-cost solution for varying boundary conditions. Breaking heights and generated tube lengths are analysed for various geometrical and hydraulic conditions to find set-ups for the creation of stationary breaking waves. En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.672831
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 338-343[article] Artificial stationary breaking surf waves in a physical and numerical model [texte imprimé] / Mario Oertel, Auteur ; Jan Mönkemöller, Auteur ; Andreas Schlenkhoff, Auteur . - 2012 . - pp. 338-343.
Hydraulique
Langues : Anglais (eng)
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 338-343
Mots-clés : Artificial stationary surf wave Breaking Numerical model Physical Tube length VOF Résumé : Surfing is one of the most popular water sports. A number of regional coastal hotspots have naturally breaking surf waves, but wave heights and breaking processes depend on various boundary conditions like seabed geometry, beach formation and swell direction. Since the optimum combination of these conditions is rare in time and place, the formation of surfable waves cannot be guaranteed. In addition, the sport's popularity is currently rising even in inland regions, and with it the interest in generating artificial surf waves in rivers or technical constructions to provide surfable waves at any time and place. This research focuses on small-scale surf waves in a physical and numerical model to identify easy-to-handle geometries and to validate numerical simulations as a low-cost solution for varying boundary conditions. Breaking heights and generated tube lengths are analysed for various geometrical and hydraulic conditions to find set-ups for the creation of stationary breaking waves. En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.672831 Exemplaires
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Titre : Backwater effects of Jambor weir sill Type de document : texte imprimé Auteurs : Michael Gebhardt, Auteur ; Udo Pfrommer, Auteur ; Fabian Belzner, Auteur Année de publication : 2012 Article en page(s) : pp. 344-349 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Backwater effect Broad-crested weir Drag coefficient Submerged flow Weir sill Résumé : Compared with traditional weirs, Jambor weirs have the advantage that they reduce afflux due to their hydraulically-optimized shape. Hence, for identical discharge capacity, the height of the gate and thus the cost are reduced significantly. Although Jambor weir sills have been used in a combination with movable weirs for decades, the relationship between sill height, headwater and tailwater conditions and the resulting discharge has so far not been investigated systematically. Based on extensive tests in a hydraulic flume, an empirical equation and a dimensionless design chart were developed to estimate the backwater effect in the design phase to achieve the highest possible weir sill with an optimum hydraulic performance. En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.686712
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 344-349[article] Backwater effects of Jambor weir sill [texte imprimé] / Michael Gebhardt, Auteur ; Udo Pfrommer, Auteur ; Fabian Belzner, Auteur . - 2012 . - pp. 344-349.
Hydraulique
Langues : Anglais (eng)
in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 344-349
Mots-clés : Backwater effect Broad-crested weir Drag coefficient Submerged flow Weir sill Résumé : Compared with traditional weirs, Jambor weirs have the advantage that they reduce afflux due to their hydraulically-optimized shape. Hence, for identical discharge capacity, the height of the gate and thus the cost are reduced significantly. Although Jambor weir sills have been used in a combination with movable weirs for decades, the relationship between sill height, headwater and tailwater conditions and the resulting discharge has so far not been investigated systematically. Based on extensive tests in a hydraulic flume, an empirical equation and a dimensionless design chart were developed to estimate the backwater effect in the design phase to achieve the highest possible weir sill with an optimum hydraulic performance. En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.686712 Exemplaires
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