Results 21 to 30 of about 79,589 (237)

Characterizing bed roughness on the Antarctic continental margin

Journal of Glaciology, 2023
Spatial variability in bed topography, characterized as bed roughness, impacts ice-sheet flow and organization and can be used to infer subglacial conditions and processes, yet is difficult to quantify due to sparse observations. Paleo-subglacial beds of
Santiago Munevar Garcia, Lauren Elizabeth Miller, Francesca Anna Maria Falcini, Leigh Asher Stearns   +3 more
doaj   +1 more source

Subglacial roughness of the Greenland Ice Sheet: relationship with contemporary ice velocity and geology [PDF]

The Cryosphere, 2019
The subglacial environment of the Greenland Ice Sheet (GrIS) is poorly constrained both in its bulk properties, for example geology, the presence of sediment, and the presence of water, and interfacial conditions, such as roughness and bed rheology ...
M. A. Cooper, M. A. Cooper, T. M. Jordan, T. M. Jordan, D. M. Schroeder, D. M. Schroeder, M. J. Siegert, C. N. Williams, C. N. Williams, J. L. Bamber   +9 more
doaj   +1 more source

Is the critical Shields stress for incipient sediment motion dependent on channel-bed slope? [PDF]

, 2008
Data from laboratory flumes and natural streams show that the critical Shields stress for initial sediment motion increases with channel slope, which indicates that particles of the same size are more stable on steeper slopes.
Dietrich, William E., Lamb, Michael P., Venditti, Jeremy G.   +2 more
core   +1 more source

Quantifying bed roughness beneath contemporary and palaeo-ice streams

Journal of Glaciology, 2018
Bed roughness is an important control on ice-stream location and dynamics. The majority of previous bed roughness studies have been based on data derived from radio-echo sounding (RES) transects across Antarctica and Greenland.
FRANCESCA A.M. FALCINI, DAVID M. RIPPIN, MAARTEN KRABBENDAM, KATHERINE A. SELBY   +3 more
doaj   +1 more source

Effect of near‐bed turbulence on chronic detachment of epilithic biofilm: Experimental and modeling approaches. [PDF]

, 2010
The biomass dynamics of epilithic biofilm, a collective term for a complex microorganism community that grows on gravel bed rivers, was investigated by coupling experimental and numerical approaches focusing on epilithic biofilm‐flow interactions.
Ahmed Kettab, Asaeda, Asaeda, Auer, Belkhadir, Bentham, Biggs, Biggs, Borchardt, Bothwell, Boulêtreau, Boulêtreau, Capdeville, Cheng, Flipo, Frédéric Garabétian, Frédéric Y. Moulin, Fuller, Ghosh, Godillot, Hamlyn, Hart, Hondzo, Horner, Horner, Jeffrey, José Miguel Sánchez-Pérez, Kliment, Krause, Labiod, Lekfir, Lock, Lopez, Lopez, Mayer, McIntire, McLean, Mignot, Minshall, Momo, Moulin, Moulin, Myriam Graba, Nepf, Nezu, Nielsen, Nikora, Nikora, Nikora, Nikora, Nikora, Nikora, Olivier Eiff, Py, Reiter, Reiter, Reiter, Sabine Sauvage, Saravia, Stevenson, Stevenson, Stéphanie Boulêtreau, Uehlinger, Wilcock, Winterbourn, Xu   +65 more
core   +2 more sources

PREDICTING MOVABLE BED ROUGHNESS IN COASTAL WATERS [PDF]

Coastal Engineering Proceedings, 2011
Accurately predicting movable bed roughness is essential to the analyses of transport processes, but when the bottom is rippled, as it commonly is in the coastal environment, characterizing the roughness is less straightforward than when the bottom is flat.
Humbyrd, Chelsea Joy, Madsen, Ole S.
openaire   +2 more sources

Formula of movable bed roughness for the Middle Yangtze River

Shui kexue jinzhan, 2020
The computation of movable bed roughness is an important step in morphodynamic models. After the operation of the Three Gorges Project (TGP), a dramatic decrease of sediment load entering the Middle Yangtze River (MYR) caused the processes of channel ...
Xin LIU, Junqiang XIA, Meirong ZHOU, Shanshan DENG   +3 more
doaj   +1 more source

Very-large-scale motions in rough-bed open-channel flow [PDF]

, 2017
Acknowledgements The study has been supported by two EPSRC/UK grants, ‘High-resolution numerical and experimental studies of turbulence-induced sediment erosion and near-bed transport’ (EP/G056404/1) and ‘Bed friction in rough-bed free-surface flows: a ...
Cameron, S. M., Nikora, V. I., Stewart, M. T.   +2 more
core   +1 more source

The Influence of Bed Roughness on Turbulence: Cabras Lagoon, Sardinia, Italy

Journal of Marine Science and Engineering, 2015
Estimates of bed roughness used for predictions of sediment transport are usually derived either from simple scalars of the physical roughness (i.e., ripple height or grain size) or from the hydrodynamic roughness length (Zo) based upon velocity gradient
Clémentine Chirol, Carl L. Amos, Hachem Kassem, Alice Lefebvre, Georg Umgiesser, Andrea Cucco   +5 more
doaj   +1 more source

Bed-Load Effects on Hydrodynamics of Rough-Bed Open-Channel Flows [PDF]

Journal of Hydraulic Engineering, 2005
The extent to which turbulent structure is affected by bed-load transport is investigated experimentally using a nonporous fixed planar bed comprising mixed-sized granular sediment with a d50 of 1.95 mm. Three different sizes of sediment ~d50= 0.77, 1.99, and 3.96 mm!
CAMPBELL L. J, MCEWAN I. K, NIKORA V. I, POKRAJAC D, GALLAGHER M, MANES, COSTANTINO   +5 more
openaire   +3 more sources