Cape May Point 227 Project
0
-1
-2
Cell 6-Double-T
-3
-4
23
-5
Cell 6
-6
-7
-8
23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
1
Unit #
DOUBLE-T As-Built Elevations 10/07/02
72
Cape May Point 227 Project
Cell 5
0
-1
Cell 5-Beachsaver
-2
-3
-4
1
-5
-6
-7
-8
73 70 67 64 61 58 55 52 49 46 43 40 37 34 31 28 25 22 19 16 13 10 7 4 1
Unit #
BEACHSAVER During Construction 8/16/02 to 9/25/02
As-Built Elevations 10/07/02
Figure 8. Settlement measurements and placement layout of Beachsaver Reef and
Double-T Sill. Measurements made at top of each unit (at arrow).
change in elevation of the top of the Beachsaver Reef units from when each unit was
placed (dark line on plot) and on 7 October (light line on plot), some twelve days after
final installation. The average settlement was 0.2 m and the average crest elevation was
within the planned range of 0.9 to 1.2 m. Three of the units have settled into a suspected
scour hole with a loss of 1.2 m of elevation. Most of the Double-T sill unit crests were
placed between 1.8 and 2.1 m depth as planned (Figure 8).
Subsequent surveys will be obtained at four survey intervals (March, June,
September and December) for a period of two years for both beach profiles and
settlement. In the event of a storm with significant shoreline impacts, an expedited
survey will also be obtained. Scour, settlement and reorientation need to be documented
to evaluate projects structural stability. Excessive changes in the positions of both types
of units may affect their ability to retain sand. The new geotextile fabric layer will be
evaluated as to its effectiveness in preventing scour and settlement.
Sediments
Sediment samples were collected from the mid-tide area in cells 5 and 6 in April
2002 to characterize the winter grain size distributions. An additional sample series was
collected along selected profile lines in August 2002 to characterize the pre-project grain
size distribution within all of the groin compartments. Preliminary analysis of these
sediment samples indicates that the beach in this area contains a coarse fraction, most
likely due to the high wave/current interactions at this location. Both spatial and
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