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
14
CORE 14D:
Core 14D was taken at a water depth of 8.5m (28ft) (Table 1) and had a total
length of 138cm (54.3in) (Figures 97&98). A total of 8grain size samples were taken at
depths of 1-10cm (0.4-3.9in), 21-30cm (8.3-11.8in), 31-40cm (12.2 15.7in), 51-58cm
(20.1-22.8in), 61-70cm (28-31.5in), 91-100cm (35.8-39.4in), 101-110cm (39.3-43.3in)
and 121-130cm (47.6-51.2in). Analyses from the core revealed that there was a sandy
mud layer for the first 57cm (22.4in) of the core with a sand content less than 50%. From
57cm (22.4in) to 100cm (39.4in) there is a sand layer with sand content of up to 80% and
a mean grain size greater than 0.04mm (4.7phi). At the bottom of the core there is an
additional muddy layer with sand content less than 45% (Tables 65&66). Sand and shell
weights are shown in Table 64. Percent sand, silt and clay are shown in Table 65.
Median grain size, mean grain size, skewness and sorting index are shown in Table 66.
Graphs of the results are located in Figures 99-102.
It was determined that core 14D had approximately 45cm (17.7in) of sediment
contained at least 50% sand, of which 40cm (15.7in) was located shallower than 1m
(39.4in)depth. The average grain size in the upper 1m (3.28ft) was determined to be
0.0451mm.
125
Figure 97: Core Log of 14D for depths 0-150cm
Figure 98: Computerized core log for 14D
126
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)
14D
1-10
18.72
1.17
14D
21-30
15.44
1.85
14D
31-40
14.54
5.14
14D
51-58
6.95
1.58
14D 61-70
0.00
0.02
0.01 0.02 0.05 0.18 0.28 0.36 11.82 63.30 44.89 4.89
14D 91-100
0.08
0.05
0.08 0.08 0.06 0.10 0.20 0.40 13.93 88.42 24.68 2.20
14D
101-110
29.06
5.60
14D
121-130
12.50
1.54
Table 62: RO-TAP data for core 14D
127
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
14D
1-10
50.2
31.3
14D
21-30
68.4
43.0
14D
31-40
71.8
31.8
14D
51-58
81.6
59.4
14D
61-70
100.0 100.0 100.0 100.0 99.9 99.8 99.7 99.5
92.9 57.7 32.7
9.5
14D
91-100
99.9
99.9
99.9 99.8 99.8 99.7 99.6 99.3
90.5 34.8 19.2
6.8
14D
101-110
54.7
27.6
14D
121-130
70.5
45.7
Table 63: Percent Finer table for core 14
128
Core ID
Sample Depth (cm)
shell weight
200+ weight
200-230 weight
sand + shell
14D 1-10
18.72
1.17
18.72
14D 21-30
15.44
1.85
15.44
14D 31-40
14.54
5.14
14.54
14D 51-58
6.95
1.58
6.95
14D 61-70
0.28
120.65
4.89
120.93
14D 91-100
0.45
127.63
2.20
128.08
14D 101-110
29.06
5.60
29.06
14D 121
