Figure
10. Sidescan-sonar (bottom panel) and sediment-sample (top panel) transects from the lower
beach face to the middle shelf. Sidescan-sonar image shows a high backscatter return from
the sand-dollar field on the lower beach face, but otherwise the signature is a uniform
low backscatter. The sediment samples, by contrast, show a progressive offshore fining of
the surface sediments. On the lower beach face, surface sediments are primarily fine sand.
On the inner shelf, the very-fine sand fraction increases from 45% in 18 m water depth to
62% in 58 m water depth. Mud content increases gradually across the inner shelf, and
seaward of the sample in 58 m water depth it exceeds 25%. Click on the figure to
view a larger image. Figure location shown in Fig. 4.
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Figure
10. Sidescan-sonar (bottom panel) and sediment-sample (top panel) transects from the lower
beach face to the middle shelf. Sidescan-sonar image shows a high backscatter return from
the sand-dollar field on the lower beach face, but otherwise the signature is a uniform
low backscatter. The sediment samples, by contrast, show a progressive offshore fining of
the surface sediments. On the lower beach face, surface sediments are primarily fine sand.
On the inner shelf, the very-fine sand fraction increases from 45% in 18 m water depth to
62% in 58 m water depth. Mud content increases gradually across the inner shelf, and
seaward of the sample in 58 m water depth it exceeds 25%. Click on the figure to
view a larger image. Figure location shown in Fig. 4.