Threshold of motion of natural sediment particles in oscillatory flows

Kaiming She, L. Trim, David Pope

Research output: Contribution to journalArticlepeer-review


The mechanism of the threshold of sediment motion under wave action has been investigated by examining the dynamic forces acting on the sediment particle. The force analysis has led to a range of nondimensional parameters of clear physical significance, which are then applied to the analysis of a range of existing experimental data. The introduction of some new nondimensional parameters has resulted in significant improvement in the definition of the threshold of motion condition. Several empirical equations involving different nondimensional parameters have been derived, providing a mathematical description of the threshold condition of the sediment motion. The accuracy of these empirical equations is examined in the context of scientific and engineering applications and a simple equation is recommended for its accuracy and ease of use.
Original languageEnglish
Pages (from-to)701-709
Number of pages9
JournalJournal of Coastal Research
Issue number3
Publication statusPublished - May 2006


  • incipient motion
  • sediment transport


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