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Glossary

Glossary of Terms

Marker, survey

An object placed at the site of a station to identify the surveyed location of that station.

Dune

A landform characterized by an accumulation of wind-blown sand, often vegetated.

Marsh, Salt

A marsh periodically flooded by salt water.

Undercutting

Erosion of material at the foot of a cliff or bank, e.g. a sea cliff, or river bank on the outside of a meander. Ultimately, the overhang collapses, and the process is repeated.

Micro-tidal

Tidal range less than 2m.

Photic Zone

The zone extending downward from the ocean surface within which the light is sufficient to sustain photosynthesis. The depth of this layer varies with water clarity, time of year and cloud clover, but is about 100m in the open ocean.

It may be considered the depth to which all light is filtered out except for about one percent and may be calculated as about two and a half-times the depth of a secchi disk reading.

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