100
Cumulative Grain Size
S31
Goldsmith Inlet
90
S30
80
70
S29
60
50
40
30
20
S28
10
0
-6
-4
-2
0
2
4
6
Grain Size (Phi)
Figure 3-50g. Goldsmith Inlet cumulative grain size S28-S31, 8 October 2002 and 31 July
2003
Figure 3-51 displays a plan view distribution of sediment grain size at Goldsmith
Inlet. Because exact sampling locations were not recorded, as by GPS, the grain-size
map is approximate. The plan view clearly shows the fining of sediment with distance
into the inlet and pond from the entrance. Current velocity magnitude plays a major role
in determining the distribution of grain size within an inlet, resulting in a graded deposit
and sorting within the channel. The greater velocity magnitude at the inlet mouth will
entrain and transport increasingly larger grain sizes. As the current velocity magnitude
decreases, the larger grain size fractions will be deposited, whereas finer sediments will
be transported further into the inlet.
97
Chapter 3 Field Data Collection and Analysis
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