Sediment Threshold

2014 ◽  
pp. 189-259 ◽  
Author(s):  
Subhasish Dey
Keyword(s):  
Sediment Threshold

scholarly journals SEDIMENT THRESHOLD UNDER OSCILLATORY WAVES

1974 ◽  
Vol 1 (14) ◽  
pp. 44 ◽  
Author(s):  
Paul D. Komar ◽  
Martin C. Miller
Keyword(s):  
Wave Action ◽  
Water Motion ◽  
Sediment Threshold ◽  
Oscillatory Waves

As the velocity of the water motion near the bottom under oscillatory waves is increased, there comes a stage when the water exerts a stress on the particles sufficient to cause them to move. This study reviews data on threshold of sediment motion under wave action and compares the results with the established curves for threshold under a unidirectional current.

Sediment threshold under stream flow: A state-of-the-art review

2008 ◽  
Vol 12 (1) ◽  
pp. 45-60 ◽  
Author(s):  
Subhasish Dey ◽  
Athanasios Papanicolaou
Keyword(s):  
Stream Flow ◽  
State Of The Art ◽  
Sediment Threshold

Onset of sediment motion under waves and currents

1987 ◽  
Vol 14 (2) ◽  
pp. 196-206 ◽  
Author(s):  
Michael C. Quick ◽  
Kristopher Kingston ◽  
Shenglong Lei
Keyword(s):  
Maximum Velocity ◽  
Wave Theory ◽  
Roughness Height ◽  
General Criterion ◽  
Flow Conditions ◽  
Threshold Criterion ◽  
Velocity Condition ◽  
Waves And Currents ◽  
Average Current ◽  
Sediment Threshold

Experiments have been made to study the resultant flow field and bed shear stress produced by the combination of surface waves and steady currents. Comparison has been made between the sediment threshold flow conditions for steady flow, for waves alone, and for combined waves and currents. Experiments, using a laser Doppler anemometer and sediments sieved into narrow size ranges, show that a similar maximum velocity condition, close to the bed, causes onset of motion for all the conditions tested. This maximum velocity can be calculated from the Manning equation, the log velocity law, and second-order wave theory, if it is assumed that the near-bed maximum wave and average current velocity at one roughness height above the bed combine linearly. It is demonstrated that the Shields threshold criterion can be extended to both the wave and combined wave plus current situations. The maximum velocity at approximately one roughness height above the bed is therefore shown to be a good general criterion, which can also be used to estimate the probability of sediment motion. Key words: waves and currents, sediment transport, coastal erosion.

Sediment Threshold with Upward Seepage

2004 ◽  
Vol 130 (9) ◽  
pp. 1118-1123 ◽  
Author(s):  
Subhasish Dey ◽  
Ulrich C. E. Zanke
Keyword(s):  
Sediment Threshold

Hydrodynamics of sediment threshold

2016 ◽  
Vol 28 (7) ◽  
pp. 075103 ◽  
Author(s):  
Sk Zeeshan Ali ◽  
Subhasish Dey
Keyword(s):  
Sediment Threshold

The sediment threshold over tidally induced megaripples

1986 ◽  
Vol 69 (3-4) ◽  
pp. 219-234 ◽  
Author(s):  
Kerry P. Black ◽  
Terry R. Healy
Keyword(s):  
Sediment Threshold
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