• Governing Equations
  • Model Sensitivity & Site Location
  • Ripple Geometry and Bottom Roughness
  • Model Calibration

    Long-term Studies


    Significant wave height derived from S4 pressure records. Shaded regions identify sediment transport events predicted by the model.




    1994
    Progressive trajectory plots of sediment transport




    1995
    Progressive trajectory plots of sediment transport





    Wind and current averages over selected events.

    ..wwwwwwwww.........




    Conclusions

  • Transport events are linked to waves and vary in intensity and distribution throughout the year.
  • Alongshore sediment transport dominates, but a directional bias toward
  • onshore flow is seen in the cross-shore data.
  • This bias appears to be nearly independent of mean cross-shore wind direction.



    ACKNOWLEDGMENTS

    The first author was funded through the Office of Naval Research/Augmentation Awards for Science and Engineering Research Training. Both authors were funded through NOAA's National Undersea Research Program and the Office of Naval Research. Both authors would like to thank Drs. James Irish, James Lynch and Peter Traykovski of WHOI for providing their ripple geometry and sediment concentration data.


    REFERENCES

    Glenn, S. and W. D. Grant, 1987: A suspended sediment corrrection for combined wave and current flows. J. Geophys. Res., 92, 8244-8246.

    Gross, T. F., A. E. Isley and C. R. Sherwood, 1992: Estimation of stress and bed roughness during storms on the Northern California Shelf. Cont. Shelf Res., 12, 389-413.

    Hill, P. S., A. R. M. Nowell and P. A. Jumars, 1988: Flume evaluation of the relationship between suspended sediment concentration and excess boundary shear stress. J. Geophys. Res., 93, 12,499-12,509.

    Villaret C. and J. H. Trowbridge, 1991: Effects of stratification by supended sediments on turbulent shear flows. J. Gephys. Res., 96, 10,659-10,680.

    Wikramanayake P. N. and O. S. Madsen, 1991: Calculation of movable bed friction factors. Technical report DACW-39-88-K-0047. Technical progress report for the Dredging Research Program. U.S. Army Corps of Engineers, Coastal Engineering Research Center, Vicksburg, MS, 105 pp.

    Questions???

    styles@arctic.rutgers.edu