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

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Author

Summary, in English

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.

Publishing year

2007

Language

English

Publication/Series

Coastal Sediments '07

Document type

Conference paper

Publisher

American Society of Civil Engineers (ASCE)

Topic

  • Water Engineering

Keywords

  • Threshold velocity
  • Turbulent wave conditions
  • Sediment motion
  • Laboratory measurements

Conference name

6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes

Conference date

2007-05-13 - 2007-05-17

Conference place

New Orleans, LA, United States

Status

Published