69
0
50
100
0
100
150
200
300
250
50
Depth
(cm
)
0
50
100
00
50
100
100
150
200
300
250
50
0
100
150
200
300
250
50
0
50
100
0
100
150
200
300
250
50
% Sand
% Sand
% Sand
% Sand
Line 13
Figure 47: Fence Profile for Line 13
70
13 A
B
C
D
0cm
300cm
250cm
200cm
150cm
100cm
50cm
0cm
0cm
50cm
100cm
150cm
200cm
250cm
300cm
0cm
50cm
50cm
100cm
100cm
150cm
150cm
200cm
200cm
250cm
300cm
250cm
Figure 48: Core Photographs for Line 13
10
CORE 13B:
Core 13B was taken at a water depth of 6.1m (20ft) (Table 1) and had a total
length of 240cm (94.5in) (Figures 57-59). A total of 9 grain size samples were taken at
depths of 1-10cm (0.4-3.9in), 11-20cm (4.3- 8.3in) , 101-110cm (39.3-49.8in), 131-
136cm (51.6-53.5in), 136-140cm (53.5-55.1in), 164-170cm (64.6-66.9in), 201-210cm
(78.7-82.7in), 220-230cm (86.6-90.5in) and 231-240cm (90.9-94.5in). The grain size
analyses revealed that the top 136cm (53.5in) of the core contained at least 76% sand and
had a mean grain size of no less than 0.09mm (3.4phi) (Tables 40&41). Sand and shell
weights are shown in Table 39. Percent sand, silt and clay are shown in Table 40.
Median grain size, mean grain size, skewness and sorting index are shown in Table 41.
Graphs of the results are located in Figures 60-63.
It was determined that core 13B had approximately 150cm (59.1in) of sediment
contained at least 50% sand, of which 100cm (39.4in) was located shallower than 1m
(39.4in) depth. The average grain size in the upper 1m (3.28ft) was determined to be
0.0916mm.
79
Figure 57: Core Log of 13B for depths 0-150cm
Figure 58: Core Log of 13B for depths 150-240cm
80
Figure 59: Computerized core log of 13B
81
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)
13B 1-10
0.29
0.40
0.30 0.20 0.13 0.16 0.30 1.14 9.51 61.14 34.74 13.63
13B 11-20
0.00
0.06
0.06 0.07 0.06 0.28 0.45 1.88 11.06 67.59 28.05 20.22
13B 101-110
1.01
0.85
0.58 0.39 0.21 0.37 0.65 3.53 45.64 93.03
11.79
13B 131-136
1.04
0.35
0.21 0.16 0.11 0.14 0.53 1.78 8.55 51.12 23.87 0.86
13B
136-140
13.76
3.95
13B
164-170
26.00
6.01
13B
201-210
22.40
4.01
13B
220-230
5.73
0.95
13B 231-240
3.68
5.70
5.18 4.17 1.73 0.87 0.74 4.95 70.72 39.87 0.78 6.70
Table 37: RO-TAP data for core 13B
82
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
13B
1-10
99.8
99.5
99.2 99.1 99.0 98.9 98.6 97.7
90.4 43.3 16.5
1.7
13B
11-20
100.0 100.0
99.9 99.9 99.8 99.6 99.3 98.0
90.1 42.0 22.1
2.6
13B
101-110
99.4
98.9
98.5 98.3 98.2 97.9 97.5 95.4
67.7 11.2 11.2
1.8
13B
131-136
98.9
98.5
98.3 98.1 98.0 97.8 97.3 95.4
86.2 31.2
5.6
2.8
13B
136-140
71.8
43.8
13B
164-170
58.7
17.2
13B
201-210
59.7
29.0
13B
220-230
75.7
47.2
13B
231-240
97.9
94.7
91.8 89.5 88.5 88.0 87.6 84.8
45.2 22.8 22.4
12.1
Table 38: Percent finer table for core 13B
83
Core ID
Sample Depth (cm)
shell weight
200+ weight
200-230 weight
sand + shell
13B 1-10
1.48
106.83
13.63
108.31
13B 11-20
0.53
109.03
20.22
109.56
13B 101-110
3.41
142.85
11.79
146.26
13B 131-136
2.01
85.85
0.86
87.86
13B 136-140
13.76
3.95
13.76
13B 164-170
26.00
6.01
26.00
13B 201-210
22.40
4.01
22.40
13B 220-230
5.73
