January 13, 2004
14:38
WSPC/101-CEJ
00092
Recent Developments in the Geomorphic Investigation
571
Houses
A
30
20
Sea Cliff
Oct 1997
Beach
10
Apr 1998
0
150
100
50
0
A
30
20
Building
Beach
Sea Cliff
10
0
150
100
50
0
Meters Across Shore
Fig. 3. Cliff erosion documented by LIDAR surveys (after Sallenger et al., 1999).
remained stable while other areas eroded between 1013 m (Fig. 3) (Sallenger et al.,
1999). Spatial variability in cliff response maybe related to the changes in the beach
at the base of the cliff (Sallenger et al., 1999). For example, areas experiencing
cliff erosion are also expected to be experiencing beach erosion. Removal of beach
material will make the cliff vulnerable to toe erosion, mass slumping, and subsequent
cliff retreat. This type of study illustrates the potential for correlating cliff erosion
to adjactne beach processes though LIDAR mapping.
2.3. Bathymetric lidar
LIDAR survey techniques have been expanded to facilitate the collection of bathy-
metric data. Bathymetric LIDAR surveys provide a means of collecting regional
scale bathymetric data in order to manage coastal projects from a regional perspec-
tive. This regional approach was taken in the northern Gulf of Mexico where 265 km
of shoreline were surveyed in Florida and Alabama in order to evaluate the benefits
of regional sediment management (Parson, Lillycrop, and McClung, 1999).
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