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Glossary

Glossary of Terms

Groyne Field

A series of groynes acting together to protect a section of beach. Also called a groyne system.

Mean Wave Height

The mean of all individual waves in an observation interval of approximately half an hour.

Anoxic

Refers to an environment that contains little or no dissolved oxygen and hence little or no benthic marine life. These conditions often arise in deep water locations where physical circulation of seawater is limited.

Continental Shelf

The zone bordering a continent extending from the line of permanent immersion to the depth, usually about 100 m to 200 m, where there is a marked or rather steep descent toward the great depths of the ocean.

The region of the oceanic bottom that extends outward from the shoreline, with an average slope of less than 1:100, to a line where the gradient begins to exceed 1:40 (the continental slope).

Photomosaic

An assemblage of photographs, each of which shows part of a region, put together in such a way that each point in the region appears once and only once in the assemblage, and scale variation is minimised.

Photogrammetry

The science of deducing the physical dimensions of objects from measurements on images (usually photographs) of the objects.

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