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629
Bedload at low Shields stress on arbitrarily sloping beds: failure of the Bagnold hypothesis,in review
, 2002
"... Abstract According to the Bagnold hypothesis for equilibrium bedload transport, a necessary constraint for the maintenance of equilibrium bedload transport is that the fluid shear stress at the bed must be reduced to the critical, or threshold value associated with incipient motion of grains. It was ..."
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Cited by 20 (0 self)
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. It was shown in a companion paper to the present one, however that the Bagnold hypothesis breaks down when applied to equilibrium bedload transport on beds with transverse slopes above a relatively modest value that is well below the angle of repose. This failure motivates the abandonment of the Bagnold
1 LARGE-WAVE SIMULATION OF TURBULENT FLOW INDUCED BY WAVE PROPAGATION AND BREAKING OVER CONSTANT SLOPE BED
"... In the present study, the three-dimensional, incompressible, turbulent, free-surface flow, developing by the propagation of nonlinear breaking waves over a rigid bed of constant slope, is numerically simulated. The main objective is to investigate the process of spilling wave breaking and the charac ..."
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In the present study, the three-dimensional, incompressible, turbulent, free-surface flow, developing by the propagation of nonlinear breaking waves over a rigid bed of constant slope, is numerically simulated. The main objective is to investigate the process of spilling wave breaking
THE EFFECTS OF BED SLOPE AND WAVE SKEWNESS ON SEDIMENT TRANSPORT
"... Abstract: The potential relevance of wave skewness and sloping beds on morphodynamic predictions is investigated. Based on a comparison with measurements it was shown that the phase lag is potentially important for modeling nearshore bar dynamics as it influences the suspended wave related transpor ..."
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Abstract: The potential relevance of wave skewness and sloping beds on morphodynamic predictions is investigated. Based on a comparison with measurements it was shown that the phase lag is potentially important for modeling nearshore bar dynamics as it influences the suspended wave related
Ice-stream stability on a reverse bed slope
, 2012
"... Marine-based ice streams whose beds deepen inland are thought to be inherently unstable1–3. This instability is of particular concern because significant portions of the marinebased West Antarctic and Greenland ice sheets are losing mass and their retreat could contribute significantly to future sea ..."
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Cited by 2 (0 self)
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since the Last Glacial Maximum (LGM), constrained by geophysical data, whose behaviour is consistent with the geomorphological record. We find that retreat of Marguerite Bay Ice Stream following the LGM was highly nonlinear and was interrupted by stabilizations on a reverse-sloping bed, where theory
The Modified Mild-Slope Equation
- Journal of Fluid Mechanics
, 1995
"... A modified version of the mild-slope equation is derived and its predictions of wave scattering by two-dimensional topography compared with those of other equations and with experimental data. In particular, the modified mild-slope equation is shown to be capable of describing known scattering prope ..."
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Cited by 39 (3 self)
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properties of singly and doubly periodic ripple beds, for which the mild-slope equation fails. The new equation compares favourably with other models of scattering which improve on the mild-slope equation, in that it is widely applicable and computationally cheap. 1.
Is the critical Shields stress for incipient sediment motion dependent on channel-bed slope
- Journal of Geophysical Research. v
, 2008
"... [1] 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. This observation is contrary to standard models that predict reduced ..."
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Cited by 17 (0 self)
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stability with increasing slope due to the added downstream gravitational force. Processes that might explain this discrepancy are explored using a simple force-balance model, including increased drag from channel walls and bed morphology, variable friction angles, grain emergence, flow aeration
Vertical structure of surface gravity waves propagating over a sloping sea bed: theory and field measurements
- J. Geophys. Res
, 2003
"... [1] Theoretical predictions of the vertical structure of wave motion over a sloping seabed are compared with field observations close to the bed in the nearshore zone. Of particular interest is the effect of the local slope on the magnitude and phase of the vertical velocity. Field measurements of ..."
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Cited by 1 (0 self)
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[1] Theoretical predictions of the vertical structure of wave motion over a sloping seabed are compared with field observations close to the bed in the nearshore zone. Of particular interest is the effect of the local slope on the magnitude and phase of the vertical velocity. Field measurements
Does the critical Shields stress for sediment transport depend on channel-bed slope?
"... This paper investigates why the observed critical Shields stress for incipient sediment motion deviates from the Shields curve. This deviation is often described in the literature as due to measurement errors and non-uniformity of channel-bed slope or flows. On the contrary, this paper hypothesises ..."
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This paper investigates why the observed critical Shields stress for incipient sediment motion deviates from the Shields curve. This deviation is often described in the literature as due to measurement errors and non-uniformity of channel-bed slope or flows. On the contrary, this paper hypothesises
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