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Movie 3. Bedload sediment transport characteristics at maximum flood: (a) Bedload transport rate (cm2/s) and bedload transport vectors; (b) Shear velocity magnitude and near-bed (1 m) velocity vectors; (c) Erosion rate (mm/hour); (d) Net change in bed thickness (mm). Strong bedload transport and shear velocities are found upstream and offshore as the flow separates from the headland tip. This causes rapid erosion on either side of the tip, but strong convergence of sand directly off the headland tip. As the shear velocities decrease downstream from the headland tip, bedload convergence of sand results in rapid deposition and sandbank generation.
This movie is part of a paper entitled "Modeling Sand Bank Formation Around
Tidal Headlands" by Signell and Harris, which can be found at
http://smig.usgs.gov/SMIG/features_0300/headland.html