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Closed form solution for threshold velocity for initiation of sediment motion under waves

Hanson, Hans LU and Camenen, Benoit LU (2007) 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes In Coastal Sediments '07
Abstract
The present paper presents a rational expression for the initiation of motion for non-cohesive sediment under rough turbulent wave conditions. Previously proposed relationships for the initiation of motion are examined as well as laboratory measurements corresponding to fully rough turbulent boundary layers (which is normally the case under prototype conditions). By combining the modified Shields criterion as proposed by Bagnold with the wave friction factor, f<sub>w</sub>, from Jonsson, an easily applied criterion for the threshold velocity for incipient motion under rough turbulent conditions. The new relationship is formulated as U<sub>w,cr</sub>=4<sub>cr</sub>[1.1log... (More)
The present paper presents a rational expression for the initiation of motion for non-cohesive sediment under rough turbulent wave conditions. Previously proposed relationships for the initiation of motion are examined as well as laboratory measurements corresponding to fully rough turbulent boundary layers (which is normally the case under prototype conditions). By combining the modified Shields criterion as proposed by Bagnold with the wave friction factor, f<sub>w</sub>, from Jonsson, an easily applied criterion for the threshold velocity for incipient motion under rough turbulent conditions. The new relationship is formulated as U<sub>w,cr</sub>=4<sub>cr</sub>[1.1log <sub>10</sub>(<sub>cr</sub>T/(πd<sub>50</sub>))-0.08]<sup>1/0.9</s up>. Predictions with the new criterion are shown to be in good agreement with measurements over the full range of typically encountered engineering conditions. © 2007 ASCE. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Threshold velocity, Turbulent wave conditions, Sediment motion, Laboratory measurements
in
Coastal Sediments '07
publisher
American Society of Civil Engineers (ASCE)
conference name
6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes
external identifiers
  • Scopus:34548562273
DOI
10.1061/40926(239)2
language
English
LU publication?
yes
id
b0ca76d6-7a7a-40c5-a3c9-25e6764b7734 (old id 643471)
date added to LUP
2007-12-04 14:48:45
date last changed
2016-10-13 04:46:24
@misc{b0ca76d6-7a7a-40c5-a3c9-25e6764b7734,
  abstract     = {The present paper presents a rational expression for the initiation of motion for non-cohesive sediment under rough turbulent wave conditions. Previously proposed relationships for the initiation of motion are examined as well as laboratory measurements corresponding to fully rough turbulent boundary layers (which is normally the case under prototype conditions). By combining the modified Shields criterion as proposed by Bagnold with the wave friction factor, f&lt;sub&gt;w&lt;/sub&gt;, from Jonsson, an easily applied criterion for the threshold velocity for incipient motion under rough turbulent conditions. The new relationship is formulated as U&lt;sub&gt;w,cr&lt;/sub&gt;=4&lt;sub&gt;cr&lt;/sub&gt;[1.1log &lt;sub&gt;10&lt;/sub&gt;(&lt;sub&gt;cr&lt;/sub&gt;T/(πd&lt;sub&gt;50&lt;/sub&gt;))-0.08]&lt;sup&gt;1/0.9&lt;/s up&gt;. Predictions with the new criterion are shown to be in good agreement with measurements over the full range of typically encountered engineering conditions. © 2007 ASCE.},
  author       = {Hanson, Hans and Camenen, Benoit},
  keyword      = {Threshold velocity,Turbulent wave conditions,Sediment motion,Laboratory measurements},
  language     = {eng},
  publisher    = {ARRAY(0x552af98)},
  series       = {Coastal Sediments '07},
  title        = {Closed form solution for threshold velocity for initiation of sediment motion under waves},
  url          = {http://dx.doi.org/10.1061/40926(239)2},
  year         = {2007},
}