Reef

An offshore consolidated rock hazard to navigation, with a least depth of about 20 metres (10 fathoms) or less. Often refers to coral fringing reefs in tropical waters.

Glossary of Terms

Revetment

A sloping type of shoreline armouring often constructed from large interlocking boulders. Revetments tend to have a rougher (less reflective) surface than seawalls.

Marker, reference

A mark of permanent character close to a survey station, to which it is related by an accurately measured distance and azimuth (or bearing).

Reference Point

A specified location (in plan elevation) to which measurements are refered.

In beach material studies, a specified point within the reference zone.

Diffuse Sources of Pollution

(Also called non-point sources) Multiple, not easily identifiable sources of pollution (e.g., agriculture, urban areas).

Wave Rose

Diagram showing the long-term distribution of wave height and direction.

Salinity Gradient

Change in salinity which can be expressed in parts per thousand per foot.

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Reef