105
AB
C
D
Line 14
Beach
0
50
100
% Sand
Depth (cm)
0
100
150
200
300
250
50
Depth (cm)
0
100
150
200
300
250
50
Depth (cm)
0
100
150
200
300
250
50
0
100
150
200
300
250
50
0
50
100
% Sand
0
50
100
% Sand
0
50
100
% Sand
Beach
Figure 80: Fence Profile of Line 14
106
14 B
C
D
E
0cm
50cm
0cm
50cm
100cm
150cm
0cm
50cm
100cm
150cm
200cm
0cm
50cm
100cm
150cm
200cm
250 cm
300cm
Figure 81: Core Photographs of line 14
13
CORE 14C:
Core 14C was taken at a water depth of 7.9m (26ft) (Table 1)and had a length
217cm (85.4in) (Figures 90-92). A total of 13 grain size samples were taken at depths of
1-10cm (0.4-3.9in), 21-24cm (8.3-9.4in), 24-34cm (9,4-13.4in), 34-40cm (13.4-15.7in),
71-80cm (28-31.5in), 81-90cm (31.9- 35.4in), 101-110cm (39.3-43.3in), 121-130cm
(47.6-51.2in), 131-140cm(51.6-55.1in), 141-145cm (55.5-57.1in), 161-170cm(63.3-
67in), 171-180cm (67.3-70.9in) and 181-190cm (71.3-74.8in). Core 14C observations
showed that the core was composed of a mixture of sand, muds and clays, and
consequently there was large range in percent sand throughout the core. Percent sand
ranged from 50% at the top of the core, to 86% midway down the core to 1% at the very
bottom of the core, with much variation between (Table 60). Sand and shell weights are
shown in Table 59. Percent sand, silt and clay are shown in Table 60. Median grain size,
mean grain size, skewness and sorting index are shown in Table 61. Graphs of the results
are located in Figures 93-96.
It was determined that core 14C had approximately 70cm (27.6in) of sediment
contained at least 50% sand, of which 30cm (11.8in) was located shallower than 1m
(39.4in) depth. The average grain size in the upper 1m (3.28ft) was determined to be
0.0647mm.
116
Figure 90: Core log of 14C for depths 0-150cm
Figure 91: Core log of 14C for depths 150-300cm
117
Figure 92: Computerized core log of 14C
118
Core
ID 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)
14C
1-10
26.91
7.06
14C
21-24
13.62
1.97
14C 24-34
3.38
3.24
2.14 1.62 0.76 0.49 0.72 1.35 3.55 43.23 32.78 11.79
14C
34-40
21.76
3.40
14C
71-80
21.60
9.19
14C 81-90
0.00
0.01
0.02 0.02 0.01 0.03 0.05 0.22 3.29 39.34 29.05 5.81
14C 101-110
0.08
0.01
0.04 0.03 0.05 0.11 0.23 0.48 5.97 53.66 23.71 3.67
14C 121-130
1.14
0.25
0.70 0.76 0.80 0.86 1.58 5.98 10.87 33.08 28.04 20.14
14C 141-145
0.01
0.05
0.08 0.13 0.08 0.13 0.29 0.82 32.38 24.84 20.92 7.59
14C
161-170
15.20
3.34
14C
171-180
6.46
3.19
14C
181-190
0.23
0.20
14C 131-140
1.89
0.56
1.50 1.21 0.98 0.76 1.31 2.93 4.12 19.72 12.81 7.83
Table 57: RO-TAP data for core 14C
119
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
14C
1-10
53.7
28.9
14C
21-24
68.4
50.6
14C
24-34
97.3
94.7
93.0 91.7 91.1 90.7 90.1 89.0
86.2 51.5 25.2
9.5
14C
34-40
54.4
29.6
14C
71-80
69.1
23.5
14C
81-90
100.0 100.0 100.0 100.0 99.9 99.9 99.9 99.7
96.7 61.5 35.4
6.3
14C
101-110
99.9
99.9
99.9 99.8 99.8 99.7 99.4 98.9
92.8 37.7 13.4
4.7
14C
121-130
99.1
98.9
98.3 97.7 97.0 96.3 95.0 90.2
81.4 54.5 31.7
3.9
14C
131-140
97.4
96.7
94.6 92.9 91.6 90.6 88.8 84.8
79.1 52.2 34.7
4.1
14C
141-145
100.0
99.9
99.9 99.7 99.7 99.5 99.2 98.4
66.0 41.2 20.3
8.1
14C
161-170
74.6
44.2
14C
171-180
87.7
45.3
14C
181-190
99.4
72.7
Table 58: Percent Finer table for core 14C
120
Core ID
Sample Depth (cm)
shell weight
200+ weight
200-230 weight
sand + shell
14C 1-10
26.91
7.06
26.91
14C 21-24
13.62
1.97
13.62
14C 24-34
11.63
81.63
11.79
93.26
14C 34-40
21.76
3.40
21.76
14C 71-80
21.60
9.19
21.60
14C 81-90
0.09
71.95
5.81
72.04
14C 101-110
0.32
84.05
3.67
84.37
14C 121-130
4.51
79.55
20.14
84.06
14C 141-145
0.48
79.25
7.59
79.73
14C 161-170
15.20
3.34
15.20
14C 171-180
6.46
3.19
6.46
14C 181-190
0.23
0.20
0.23
14C 131-140
6.90
40.89
7.83
47.79
Table 59: Shell and Sand weight for core 14C
121
Core ID
sample id
mid sample
depth
% shell
% sand
%silt
%clay
