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R.H. Charlier and Chr. P. De Meyer
Mean Lower Low Water (MLLW) : Average height of the daily lower low
waters over a 19-year period. Only the lower low water of each pair of low
waters of a tidal day is included in the mean. Long used as the datum for
Pacific coast navigation charts, it is now gradually being adopted for use
across tile United States.
Mean Sea Level : Average height of the sea surface over a 19-year period. Not
necessarily equal to MEAN TIDE LEVEL.
Mean Tide l~vel : Plane midway" between MEAN HIGH WATER and MEAN
LOW WATER. Not necessarily equal to MEAN SEA LEVEL. Also called
half-tide level.
Module : A structural component, a number of which are joined to make a
whole.
Neap tide : A tide having about 10 to 30 percent less range than the average,
occurring about the time of quarter moons.
Nearshore : In beach terminology, an indefinite zone extending seaward from
the shoreline well beyond the breaker zone.
Nourishment : Process of replenishing a beach either naturally by longshore
transport due accretion, or artificially by delivery of materials dredged or
excavated elsewhere.
Offshore : (1) (Noun) In beach terminology, comparatively flat zone of variable
width extending from the breaker zone to the seaward edge of the
Continental Shelf, (2) (Adjective) Direction seaward from the shore toward a
large body of water.
Onshore : The landward direction, away from the water.
Overtopping : The passing of water over the top of a natural or man-made
structure as a result of wave runup or surge.
Peat : Residual product produced by partial decomposition of organic matter in
marshes and bogs.
Peat Pot (vegetation) : Pot formed from compressed peat and filled either with
soil or peat moss in which a plant or plants, grown from seed, are
transplanted without being removed from the pot.
Perched beach : A beach or fillet of sand retained above the otherwise normal
profile level by a submerged dike or sill.
......
R.H. Charlier and Chr. P. De Meyer
Mean Lower Low Water (MLLW) : Average height of the daily lower low
waters over a 19-year period. Only the lower low water of each pair of low
waters of a tidal day is included in the mean. Long used as the datum for
Pacific coast navigation charts, it is now gradually being adopted for use
across tile United States.
Mean Sea Level : Average height of the sea surface over a 19-year period. Not
necessarily equal to MEAN TIDE LEVEL.
Mean Tide l~vel : Plane midway" between MEAN HIGH WATER and MEAN
LOW WATER. Not necessarily equal to MEAN SEA LEVEL. Also called
half-tide level.
Module : A structural component, a number of which are joined to make a
whole.
Neap tide : A tide having about 10 to 30 percent less range than the average,
occurring about the time of quarter moons.
Nearshore : In beach terminology, an indefinite zone extending seaward from
the shoreline well beyond the breaker zone.
Nourishment : Process of replenishing a beach either naturally by longshore
transport due accretion, or artificially by delivery of materials dredged or
excavated elsewhere.
Offshore : (1) (Noun) In beach terminology, comparatively flat zone of variable
width extending from the breaker zone to the seaward edge of the
Continental Shelf, (2) (Adjective) Direction seaward from the shore toward a
large body of water.
Onshore : The landward direction, away from the water.
Overtopping : The passing of water over the top of a natural or man-made
structure as a result of wave runup or surge.
Peat : Residual product produced by partial decomposition of organic matter in
marshes and bogs.
Peat Pot (vegetation) : Pot formed from compressed peat and filled either with
soil or peat moss in which a plant or plants, grown from seed, are
transplanted without being removed from the pot.
Perched beach : A beach or fillet of sand retained above the otherwise normal
profile level by a submerged dike or sill.