Journal of hydraulic research, Vol. 50 N° 1. Journal of hydraulic research - Janvier/Février 2012
| Titre : | Journal of hydraulic research, Vol. 50 N° 1. Journal of hydraulic research - Janvier/Février 2012 |
| Type de document : | Bulletin |
| Paru le : | 11/06/2012 |
Dépouillements
Article : texte imprimé
Although the Bond number is generally known in fluid mechanics to describe the effects of surface tension and weight of a liquid drop or bubble, W.N. Bond as an individual is currently hardly known. Based on a lucky coincidence, the author was a[...]
Article : texte imprimé
Herein, a phenomenological theory that unifies the flow resistance caused by a variety of submerged bluff bodies, including cylindrical vegetation, two-dimensional dunes and the roughness elements studied in Schlichting's 1936 experiments, is pr[...]
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The current pier scour design in the USA is mainly based on the CSU equation, yet a recent incisive evaluation indicates a need to change it because substantial advances were made in the last two decades for understanding the pier scour processe[...]
Article : texte imprimé
David N. Powell, Auteur ;
Abdul A. Khan, Auteur
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The transport mechanism as well as the extent and the shape of the scour upstream of a circular orifice is investigated under steady flow conditions for different sediment sizes and heads on the orifice. The main mechanism of sediment transport [...]
Article : texte imprimé
Roberto Gaudio, Auteur ;
Ali Tafarojnoruz, Auteur ;
Francesco Calomino, Auteur
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This study presents the results of clear-water tests on the following five combined flow-altering countermeasures against bridge pier scour: (1) submerged vanes and a bed sill, (2) slot and sacrificial piles, (3) a collar and sacrificial piles, [...]
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Alessio Radice, Auteur ;
Chau K. Tran, Auteur
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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 [...]
Article : texte imprimé
Mingdeng Zhao, Auteur ;
Wenxin Huai, Auteur ;
Jie Han, Auteur
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Wetland flow is currently actively studied because of its applications in stormwater management, wastewater treatment and habitat restoration. This research applies the well-established poroelastic media flow theory to uniform laminar wetland fl[...]
Article : texte imprimé
Ehsan Khavasi, Auteur ;
Hossein Afshin, Auteur ;
Bahar Firoozabadi, Auteur
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Turbidity currents containing kaolin particles were studied experimentally in a channel and the velocity and concentration profiles were measured using an acoustic Doppler velocimeter. These experiments were performed to investigate the depositi[...]
Article : texte imprimé
Sylvie Van Emelen, Auteur ;
Soares-Frazão, Sandra, Auteur ;
Cyrus K. Riahi-Nezhad, Auteur
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The City of New Orleans is surrounded by an intricate network of floodwalls and dikes built to protect it from flooding from the Mississippi River and Lake Pontchartrain. In 2005, following Hurricane Katrina, New Orleans experienced one of the m[...]
Article : texte imprimé
Hasan Zobeyer, Auteur ;
Peter Steffler, Auteur
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Herein, a coupled depth-averaged (DA) and Reynolds-averaged Navier–Stokes (RANS) model is developed for steady plane open-channel flows with or without the assumption of hydrostatic pressure (HP). Initially, the water surface and the DA velocity[...]
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Mario Oertel, Auteur ;
Daniel B. Bung, Auteur
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Since several decades, dam-break waves have been of main research interest. Mathematical approaches have been developed by analytical, physical and numerical models within the past 120 years. During the past 10 years, the number of research inve[...]
Article : texte imprimé
Ayaka Kashima, Auteur ;
Lee, Pedro J., Auteur ;
Roger Nokes, Auteur
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The kinetic differential pressure (KDP) method for measuring unsteady discharge in pressurized fluid conduits is introduced. The method utilizes two pressure measurements to estimate the unsteady discharge at the sampling rate of the pressure se[...]
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Zhonghua Yang, Auteur ;
Wei Gao, Auteur ;
Wenxin Huai, Auteur
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A new model is developed to estimate the discharge capacity in straight, symmetric, compound open channels based on the energy concept. The energy loss and the transition mechanism in these channels are analysed based on mechanical analysis, in [...]
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Abdorreza Kabiri-Samani, Auteur ;
Amir Javaheri, Auteur
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A comprehensive experimental investigation was performed to better understand the effect of the weir geometry of a Piano Key weir (PKW) on the discharge coefficient for both free and submerged flow conditions. Experiments were conducted in a 12 [...]
Article : texte imprimé
G. Adriana Camino, Auteur ;
David Z. Zhu, Auteur ;
Nallamuthu Rajaratnam, Auteur
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Assessing the amount of energy dissipation that can be achieved by simple jet diffusion in a confined environment has considerable practical importance. Previous works on jets in confined enclosures have indicated that the entrainment of a recir[...]
Article : texte imprimé
Gorazd Novak, Auteur ;
Franc Steinman, Auteur ;
Matej Müller, Auteur
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A visualization method was employed for accurate non-intrusive measurement of velocity fields at a physical model of a sharp-crested rectangular sideweir under subcritical flow. The experimental observation of velocity vectors at various horizon[...]
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In this study, a new parameterization is proposed to be incorporated into the classical integral model for bubble plumes. The virtual origin of the flow, the entrainment coefficient and the momentum amplification factor were obtained by adjustin[...]
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Gonzalo Simarro, Auteur ;
Sofia Civeira, Auteur ;
António H. Cardoso, Auteur
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This technical note focuses on the plan geometry of riprap mattresses to protect spill-through abutments against local scour through edge failure. Two non-standard riprap apron geometries are experimentally studied. The performance of the new ge[...]
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