Publication
Mass-based depth and velocity scales for gravity currents and related flows
Related publications (48)
A model for entrainment in avalanches and debris flows based on PIV measurements of viscous gravity currents.
Christophe Ancey, Belinda Margaret Bates
A simple experiment, designed to investigate entrainment in geophysical free-surface flows such as avalanches and debris flows, was performed using a dam break of viscous fluid which travels over a rigid bed until meeting a shallow layer of the same fluid ...
2014Manipulating flow separation: sensitivity of stagnation points, separatrix angles and recirculation area to steady actuation
François Gallaire, Edouard Boujo
A variational technique is used to derive analytical expressions for the sensitivity of several topological indicators of flow separation to steady actuation. Considering the boundary layer flow above a wall-mounted bump, the six following representative q ...
Royal Soc2014Influencing Flow Patterns and Bed Morphology in Open Channels and Rivers by Means of an Air-Bubble Screen
Anton Schleiss, Koen Blanckaert, Violaine Dugué
The ability of a bubble screen to redistribute the flow field and bed morphology in shallow rivers and open channels has been investigated in laboratory experiments. Rising air bubbles generated by a pressurized porous tube situated on the bed induced seco ...
American Society of Civil Engineers2014Head losses in junction manholes for free surface flows in circular conduits
Michael Pfister, Corrado Gisonni
Former studies on combining flows resulted in an efficient layout of sewer junctions operated under supercritical approach flow conditions. Straight extensions allowed a reduction in the shock wave heights generated by the merging flows, so that the global ...
Asce-Amer Soc Civil Engineers2014Shear velocity estimates in rough-bed open-channel flow
Ulrich Lemmin, Fereshteh Bagherimiyab Hunkeler
Shear velocity u(*) is an important parameter in geophysical flows, in particular with respect to sediment transport dynamics. In this study, we investigate the feasibility of applying five standard methods [the logarithmic mean velocity profile, the Reyno ...
Wiley-Blackwell2013Forced reattachment in separated flows: a variational approach to recirculation length reduction
François Gallaire, Edouard Boujo
Sensitivity analysis is used to design an open-loop control for separated flows. The length of the recirculation region is expressed as a cost functional, and its sensitivity to actuation is derived analytically. This analysis allows to identify regi ...
2013Jets opposing turbidity currents and open channel flows
Anton Schleiss, Christoph Oehy
Hydraulic jumps at the tail end of spillways are usually induced by baffle blocks or other obstacles. Such jumps can also be induced by jets that oppose the main flow. Another application is to back up turbidity currents in reservoirs by means of opposing ...
Asce-Amer Soc Civil Engineers2013Adiabatic vertical downward air-water flow pattern map: influence of inlet device, flow development length and hysteresis effects
John Richard Thome, Navid Borhani, Marco Milan
Flow patterns for adiabatic vertical downward air water flow in an 8.8 mm diameter channel have been studied. In particular, the influence of the inlet device, the flow history and the development length on the flow pattern have been investigated and asses ...
Elsevier2013Discussion “Propagation of surge waves in channels with large-scale bank roughness"
In open channels, a sudden rise in water elevation generates a positive surge. Positive surges are commonly observed in man-made channels (Bazin 1865, Treske 1994) and a natural occurrence is the tidal bore in macro-tidal estuaries (Tricker 1965, Chanson 2 ...
2013Sediment Suspension Dynamics in Turbulent Unsteady, Depth-Varying Open-Channel Flow over a Gravel Bed
Fereshteh Bagherimiyab Hunkeler
Even though flow in natural rivers and channels is generally unsteady, only a few studies on turbulent structures in unsteady open-channel flows have been carried out. In hydraulic engineering problems, unsteady flow is often approximated with concepts of ...
EPFL2012