Encontrados 7 documentos, a visualizar página 1 de 1
The thickness of the transport layer in stratified geomorphic flows
Leal, J. B.; Ferreira, Rui M. L.; Cardoso, António H.River Flow 2010 ; This paper is aimed at the development of a model for the thickness of the transport layer in stratified geomorphic flows such as sheet-flows or immature debris flows occurring, for instance, as a consequence of dam failure. These are flows with high geomorphic potential, occurring at or generating high shear stresses, whose ultimate driving mechanism is gravity. The micromechanical character...
Geomorphic dam-break flows. Part II: numerical simulation
Leal, J. G. A. B.; Ferreira, Rui M. L.; Cardoso, António H.Proceedings of the Institution of Civil Engineers - Water Management 163 Issue WM6
A conceptual model for sheet-flow drawn from rapid granular flow theories
Leal, J. B.; Ferreira, Rui M. L.; Nicolau, Vanessa A.; Amaral, Sílvia R.; Almeida, António B.33rd IAHR Congress: Water Engineering for a Sustainable Environment ; This paper is aimed at presenting i) a simple, yet sound, conceptual model applicable to the simulation of erosion, deposition and transport of cohesionless sediment in stratified flows under high shear stresses and ii) numerical solutions in idealized unsteady flow non-equilibrium transport situations. The conceptual model for the granular ...
Organised turbulence over mobile and immobile hydraulically rough boundaries
Leal, J. B.; Ferreira, Rui M. L.; Franca, Mário J.; Cardoso, António H.33rd IAHR Congress: Water Engineering for a Sustainable Environment ; The present work is aimed at the study of near-bed organised turbulence over mobile and immobile, porous, hydraulically rough boundaries. The bed was permeable and composed of non-cohesive sediments. Two data sets were analysed, characterised by the same u*. The mobile bed data featured generalised sediment transport for all size fractions s...
Maximum level and time to peak of dam-break waves on mobile horizontal bed
Leal, J. B.; Ferreira, Rui M. L.; Cardoso, António H.Journal of Hydraulic Engineering, Vol. 135, No. 11, November 1, 2009 ; This experimental study focuses the influence of bed material mobility and initial downstream water level on maximum water level and time to peak of dam-break waves. It covers horizontal bed conditions on fixed bed, sand bed, and pumice bed. Results include water surface level time evolution, maxima wave levels and time to peak. The influen...
Parameterization of the logarithmic layer of double-averaged streamwise velocit...
Franca, Mário J.; Ferreira, Rui M. L.; Lemmin, UlrichThe logarithmic layer of double-averaged (in time and space) streamwise velocity profiles obtained from field measurements made in the Swiss rivers, Venoge and Chamberonne is parameterized and discussed. Velocity measurements were made using a 3D Acoustic Doppler Velocity Profiler. Both riverbeds are hydraulically rough, composed of coarse gravel, with relative submergences (h/D50) of 5.25 and 5.96, respectivel...
Flow resistance in open-channel flows with mobile hydraulically rough beds
Leal, J. B.; Ferreira, Rui M. L.; Franca, Mário J. P.River Flow 2008, Vol.1
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