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Glossary

Glossary of Terms

Dynamic Equilibrium

A system in flux, but with influxes equal to outfluxes.

Mean Low Water (MLW)

The average height of the low water over a 19-year period. For shorter periods of observations, corrections are applied to eliminate known variations and reduce the results to the equivalent of a mean 19-year value. All low water heights are included in the average where the type of tide is either semi-diurnal or mixed.

Groyne

Narrow, roughly shore-normal structure built to reduce longshore currents, and/or to trap and retain littoral material. Most groins are of rock and extend from the backshore, well onto the foreshore and rarely even further offshore.

Coral

Colonial animals in the phylum Cnidaria; mainly those that build reefs. "Coral" is also often used to refer to the hard, calcareous coral skeleton.

Non-governmental Organisation (NGO)

An organisation, usually non-profit, that is not part of the central, local, or municipal government.

Sediment Sink

Point or area at which beach material is irretrievably lost from a coastal cell, such as an estuary, or a deep channel in the seabed.

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