Figure 10. Envelope of cross-section surveys during the SandyDuck experiment showing large variations of bottom
topography. During this period the sand bar was initially at location a, migrated onshore to location b, then moved offshore
to location c during a passing storm
Figure 11. Evidence of shear waves found in 1986 during the SUPERDUCK experiment. Note the development of
large-amplitude long-period wave forms after about 120 min, when the longshore velocity increased above 4 m/sec (after
Hathaway et al. 1998)
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