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Line 12
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Beach
Figure 18: Fence Profile for Line 12
36
12A
B
100cm
250cm
100c m
0cm
0cm
50cm
50cm
150cm
200cm
0cm
0cm
50cm
50cm
100cm
100cm
150cm
150cm
200cm
200cm
C
D
Figure 19: Core photographs of Line 12
8
CORE 12C:
Core 12C was taken at a water depth of 7.9m (25.9ft.) (Table 1) and had a total
length of 144cm (43.8in) (Figures 34&35). A total of 9 grain size samples were taken at
depths of 1-10cm (0.4-3.9in), 11-21cm (4.3- 8.3in), 21-30cm (8.3-11.8in), 31-40cm (12.2
15.7in), 41-50cm (16.1-19.7), 51-60cm (20-23.6in), 61-65cm (24-25.6in), 65-70cm
(25.6-27.6), 101-110cm (39.3-49.8in). The top of this core down to approximately 65cm
(25.6in) contained a mud with sand laminations and had percent sand decreasing from 81
to 15%. At the bottom of the core there was an observed sand layer from approximately
70 to101cm (27.6 to 39.3in) which had above 77% (Tables 25&26). Sand and shell
weights are shown in Table 24. Percent sand, silt and clay are shown in Table 25.
Median grain size, mean grain size, skewness and sorting index are shown in Table 26.
Graphs of the results are located in figures 36-39.
It was determined that core 12C had approximately 60cm (23.6in) of sediment
contained at least 50% sand, of which 50cm (19.7in) was located shallower than 1m
(39.4in) depth. The average grain size in the upper 1m (3.28ft) was determined to be
0.0928mm.
53
Figure 34: Core log of 12C for depths of 0-114cm
Figure 35: Computerized core log of 12C
54
Core
ID
Sample
Depth
(cm)
#10/
2.0mm
Screen
Sample
Weight
(g)
#14/
1.40mm
Screen
Sample
Weight
(g)
#18/
1.00mm
Screen
Sample
Weight
(g)
#25/
710μm
Screen
Sample
Weight
(g)
#35/
500μm
Screen
Sample
Weight
(g)
#45/
355μm
Screen
Sample
Weight
(g)
#60/
250μm
Screen
Sample
Weight
(g)
#80/
180μm
Screen
Sample
Weight
(g)
#125/
125μm
Screen
Sample
Weight
(g)
#170/
90μm
Screen
Sample
Weight
(g)
#200/
75μm
Screen
Sample
Weight
(g)
#230/
63μm
Screen
Sample
Weight
(g)
12C 1-10
0.88
0.60
0.42 0.32 0.18 0.29 0.35 0.98 12.65 65.58 12.31 9.27
12C
11-21
24.66
1.18
12C
21-30
15.99
1.77
12C
31-40
9.85
1.05
12C
41-50
20.72
2.67
12C
51-60
30.76
4.30
12C
61-65
3.64
0.91
12C 65-70
0.10
0.18
0.16 0.15 0.11 0.13 0.16 0.51 5.52 60.07 19.67 8.61
12C 101-110
0.18
0.27
0.21 0.21 0.16 0.16 0.33 2.61 14.58 46.66 12.70 6.55
Table 22: RO-TAP data for core 12C
55
ASTM
Classification
coarse
sand
medium
sand
medium
sand
medium
sand
medium
sand
fine
sand
fine
sand
fine
sand
fine
sand
fine
sand
fine
sand silt
Wentworth
Classification
granule
very
coarse
sand
very
coarse
sand
coarse
sand
coarse
sand
medium
sand
fine
sand
fine
sand
fine
sand
very
fine
sand
very
fine
sand
very fine
silt
Core ID
Sample
Depth
(cm)
%
finer
than
N10/
2.0mm/
-1.0Φ
Screen
% finer
than
N14/
1.40mm/
-0.5Φ
Screen
% finer
than
N18/
1.00mm/
0.0Φ
Screen
% finer
than
N25/
710μm/
0.5Φ
Screen
% finer
than
N35/
500μm/
1.0Φ
Screen
% finer
than
N45/
355μm/
1.5Φ
Screen
% finer
than
N60/
250μm/
2.0Φ
Screen
% finer
than
N80/
180μm/
2.5 Φ
Screen
% finer
than
N125/
125μm/
3.0Φ
Screen
% finer
than
N170/
90μm /
3.5Φ
Screen
% finer
than
N200/
75μm /
4.0Φ
Screen
% finer
than
4μm/ 8Φ
Observed
Contents of
the sample
shell
only
shell
only
shell
only
shell
only
shell
only
shell
only
shell
only sand sand sand sand
silt
12C
1-10
99.2
98.7
98.3 98.0 97.9 97.6 97.3 96.4
85.2 27.2 16.3
4.3
12C
11-21
45.4
24.8
12C
21-30
67.0
48.9
12C
31-40
78.5
60.5
12C
41-50
62.2
45.3
12C
51-60
57.6
34.8
12C
61-65
85.0
60.7
12C
65-70
99.9
99.8
99.6 99.5 99.4 99.3 99.1 98.7
93.7 40.3 22.8
7.0
12C 101-110 99.8 99.5 99.3 99.1 98.9 98.7 98.4 95.6 79.9 29.9 16.3 23.6
Table 23: Percent Finer table for core 12C
56
Core ID
Sample Depth (cm)
shell weight
200+ weight
200-230 weight
sand + shell
12C 1-10
2.69
91.87
9.27
94.56
12C 11-21
24.66
1.18
24.66
12C 21-30
15.99
1.77
15.99
12C 31-40
9.85
1.05
9.85
12C 41-50
20.72
2.67
20.72
12C 51-60
30.76
4.30
30.76
12C 61-65
3.64
0.91
3.64
12C 65-70
0.83
85.93
8.61
86.76
12C 101-110
1.19
76.88
6.55
78.07
Table 24: Shell and Sand weights for core 12C
Core ID
sample id
mid sample
depth
% shell
% sand
%silt
%clay
