EM 1110-2-1100 (Change 1)
31 Jul 03
M
MACH-STEM WAVE
Higher-than-normal wave generated when waves strike a structure at an oblique angle.
MACRO-TIDAL
Tidal range greater than 4 m.
MANAGED RETREAT
The deliberate setting back (moving landward) of the existing line of sea defense in order to obtain engineering or
environmental advantages - also referred to as managed landward realignment. Sometimes refers to moving roads and
utilities landward in the face of shore retreat.
MANGROVE
A tropical tree with interlacing prop roots, confined to low-lying brackish areas.
MARGIN, CONTINENTAL
A zone separating a continent from the deep-sea bottom.
MARGINAL PROBABILITY
The probability of a single variable in the context of a joint probability analysis.
MARGINAL RETURN PERIOD
The return period of a single variable in the context of a joint probability analysis.
MARGINAL SEA
The maritime belt over which a coastal state asserts sovereignty.
MARIGRAM
A graphic record of the rise and fall of the tide. The record is in the form of a curve in which time is represented by
abscissas and the height of the tide by ordinates.
MARKER, REFERENCE
A mark of permanent character close to a survey station, to which it is related by an accurately measured distance
and azimuth (or bearing).
MARKER, SURVEY
An object placed at the site of a station to identify the surveyed location of that station.
MARSH
(1) A tract of soft, wet land, usually vegetated by reeds, grasses and occasionally small shrubs. (2) Soft, wet area
periodically or continuously flooded to a shallow depth, usually characterized by a particular subclass of grasses, cattails and
other low plants.
MARSH, DIKED
A former salt marsh which has been protected by a DIKE.
MARSH, SALT
A marsh periodically flooded by salt water.
MASS TRANSPORT, SHOREWARD
The movement of water due to wave motion, which carries water through the BREAKER ZONE in the direction of
wave propagation. Part of the NEARSHORE CURRENT SYSTEM.
Appendix A Glossary of Coastal Terminology
A-47
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