EM 1110-2-1100 (Part III)
30 Apr 02
Figure III-2-14.
Azimuth of normal to shoreline at Ponte Vedra Beach, Florida (Walton 1972)
(4) Another possibility is that the littoral drift rose along a shoreline is as shown in Figure III-2-18. In
this case the null (nodal) point is stable. Perturbations in the shoreline, positive (accretions) or negative
(recessions), now result in transport which tends to reduce rather than accentuate the perturbation
(a "negative" feedback mechanism). In this case there is not a self-sustaining tendency toward island
breaching Walton (1972) noted that the east coast of Florida is characterized by this type of littoral drift rose
and, in fact, there are relatively few natural inlets along this coastline and a historical tendency of those inlets
that are opened by man to close (unless closure is prevented via coastal structures such as jetties).
III-2-34
Longshore Sediment Transport
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