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Glossary of Terms

The wearing away of coastal lands, usually by wave attack, tidal or littoral currents, or wind. Coastal erosion is synonymous with shoreline (vegetation line) retreat.

BOD

Biochemical (or Biological) Oxygen Demand - high figures suggest pollution or eutrophication.

Refraction (of water waves)

The process by which the direction of a wave moving in shallow water at an angle to the contours is changed: the part of the wave advancing in shallower water moves more slowly than that part still advancing in deeper water, causing the wave crest to bend toward alignment with the underwater contours.

The bending of wave crests by currents.

Permeable Groyne

A groyne with openings or voids large enough to permit passage of appreciable quantities of littoral drift through the structure.

Monitoring

Periodic collection of data to study changes in an environment over time.

Wave Length

The horizontal distance between similar points on two successive waves measured perpendicularly to the crest.

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