EM 1110-2-1100 (Change 1)
31 Jul 03
SWASH BARS
Low broad sandy bars formed by sediment in the surf and swash zones, separated by linear depressions, or
RUNNELS, running parallel to the shore. Sand bodies that form and migrate across ebb-tidal shoals because of currents
generated by breaking waves.
SWASH CHANNEL
(1) On the open shore, a channel cut by flowing water in its return to the present body (e.g., a rip channel). (2) A
secondary channel passing through or shoreward of an inlet or river bar.
SWASH MARK
The thin wavy line of fine sand, mica scales, bits of seaweed, etc., left by the uprush when it recedes from its
upward limit of movement on the beach face.
SWASH PLATFORM
Sand sheet located between the main ebb channel of a coastal inlet and an adjacent barrier island.
SWASH ZONE
The zone of wave action on the beach, which moves as water levels vary, extending from the limit of run-down to
the limit of run-up.
SWELL
Wind-generated waves that have traveled out of their generating area. Swell characteristically exhibits a more
regular and longer period and has flatter crests than waves within their fetch (SEAS).
SYNOPTIC CHART
A chart showing the distribution of meteorological conditions over a given area at a given time. Popularly called a
weather map.
SYZYGY
The two points in the Moon's orbit when the Moon is in conjunction or opposition to the Sun relative to the Earth;
time of new or full Moon in the cycle of phases.
Appendix A Glossary of Coastal Terminology
A-79
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