Survey, hydrographic

A survey that has as its principle purpose the determination of geometric and dynamic characteristics of bodies of water.

Glossary of Terms

Impermeable groyne

A groyne constructed such that sand cannot pass through the structure (but sand may still move over or around it).

Mangrove Forest

A community of salt-tolerant trees and shrubs, with many other associated organisms, that grows on some tropical and sub-tropical coasts in a zone roughly coinciding with the intertidal zone.

Coastal Plain

The low-lying, gently-sloping area landward of the beach often containing fossil sands deposited during previously higher sea levels.

Upstream

A long coasts with obliquely approaching waves there is a longshore (wave-driven) current. For this current one can define an upstream and a downstream direction.

Upland

Dry land area above and landward of the ordinary high water mark (ohwm).

Often used as a general term to mean high land far from the coast and in the interior of the country.

Mean High Water (MHW)

The average height of the high 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 high water heights are included in the average where the type of tide is either semi-diurnal or mixed.

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Survey, hydrographic