Results 161 to 170 of about 363,183 (210)

Near-bed particle motion over transitionally-rough bed

Journal of Hydraulic Research/De Recherches Hydrauliques, 2011
The motion of sediment particles over a transitionally-rough bed is studied experimentally using a real-time high-speed imaging system. Vertical distributions of the instantaneous flow velocities were measured using acoustic Doppler velocimetry. The sediment saltation trajectories and the associated velocity components were deciphered from the high ...
Krishnan Murugesan
exaly   +2 more sources

Hydraulic Jumps on Rough Beds

Journal of Hydraulic Engineering, 2007
This paper presents the results of an experimental investigation on the hydraulic jump on horizontal rough beds. Experiments were carried out to study the effect of bed roughness on both the sequent depth ratio and the roller length. The investigation allowed the writers to positively test the reliability of a new solution of the momentum equation for ...
CAROLLO, Francesco Giuseppe, FERRO, Vito, PAMPALONE, Vincenzo   +2 more
openaire   +2 more sources

Beds without Rooms: Sleeping Rough

Journal of Interior Design, 2022
The sleep environment is considered one of the most private spaces for humans, primarily linked to a home. As the main actant of the sleep environment, a bed is usually associated with a comfortable private space: the bedroom. However, when the sleep environment is outside and visible to the public gaze, its function evolves into an urban role.
openaire   +1 more source

Numerical Investigation of Natural Rough-Bed Flow

2020
The turbulent flow in natural rough-bed watercourses is a rather complex phenomenon, still poorly investigated. The majority of the existing works on this subject is of experimental nature, while the numerical ones are mostly related to artificially and regularly-roughened beds. In the present work a numerical investigation is carried out, in which the
ALFONSI G., FERRARO D., LAURIA A., GAUDIO R.   +3 more
openaire   +3 more sources

Aerodynamic roughness length of sandy beds and gravel beds

Environmental Earth Sciences, 2012
A physical model was developed for the aerodynamic roughness length of gravel beds and sandy beds under different atmospheric stability conditions based on Monin–Obukhov similarity theory and dimensional analysis. The relationship between the roughness length, the properties of the roughness elements, the characteristics of the airflow, and an ...
Ping Lv, Zhibao Dong
openaire   +1 more source

Effective Thermal Conductivity of Rough Spheres Packed Bed

Heat Transfer: Volume 1, 2003
The effective thermal conductivity, ke, rigorously defined on the basis of the local volume averaging method, is an important parameter in porous media. The experimental and numerical results available in literature demonstrate that the kevalue is influenced by several parameters such as thermal and mechanical properties of the multiphase porous medium,
VANOLI L., Buonanno G., Caritenuto A., Giovinco G.   +3 more
openaire   +4 more sources

Velocity Distribution in the Roughness Layer of Rough-Bed Flows

Journal of Hydraulic Engineering, 2004
Several models for the vertical distribution of the double-averaged (in time and in the plane parallel to the mean bed) longitudinal velocity in the flow region between roughness troughs and roughness tops are suggested. We found that the same model for velocity distribution may be applicable to a range of flow conditions and roughness types, which ...
Vladimir Nikora, Katinka Koll, Ian McEwan, Stephen McLean, Andreas Dittrich   +4 more
openaire   +1 more source

Bed roughness produced by saltating sediment

Journal of Geophysical Research: Oceans, 1989
Several expressions for characterizing bed roughness produced by a layer of saltating sediment have previously been proposed, and another is presented herein. These expressions relate the magnitude of the bottom roughness to the thickness of the near‐bed layer of saltating particles.
Patricia L. Wiberg, David M. Rubin
openaire   +1 more source

Modelling Dynamic Bed Roughness Associated with Bed Form Development

2009
In this study bed form development was quantified and used to calculate a dynamic bed roughness parameter. An algorithm that can be readily implemented into numerical models was developed and evaluated for two scenarios, with distinct flow conditions and sediment carrying capacities.
W B Rauen, B Lin, R A Falconer
openaire   +1 more source

Surface roughness: capturing rough-bed river diversity

Channel geometry and bed surface roughness modulate the flow resistance of river channels, which is fundamental to the conveyance of water and sediment. In rough-bed rivers, where the flow is shallow relative to roughness height, there is notable uncertainty in flow resistance calculations based on sediment percentiles (D50 or D84) or the standard ...
Robert Houseago, Rebecca Hodge, Rob Ferguson, Rich Hardy, Chris Hackney, Steve Rice, Joel Johnson, Elowyn Yager, Trevor Hoey, Taís Yamasaki   +9 more
openaire   +1 more source