Geo-Marine Letters

, Volume 3, Issue 1, pp 43-48

First online:

Initial grain motion under oscillatory flow: A comparison of some threshold criteria

  • J. K. RiglerAffiliated withDepartment of Oceanography, University College
  • , M. B. CollinsAffiliated withDepartment of Oceanography, University College

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Experimental data are described on the threshold of transport of quartz, ilmenite, and cassiterite grains under oscillatory flow in a flume and the results are compared to those of other investigators. The results show that for a given particle size, critical shear stress (τcrit) increases with increasing wave period and that τcrit increases with both grain size and grain density. These data are compared with prediction equations.