EM 1110-2-1100 (Change 1)
31 Jul 03
HIGH WATER MARK
A reference mark on a structure or natural object, indicating the maximum stage of tide or flood.
HIGH WATER OF ORDINARY SPRING TIDES (HWOST)
A tidal datum appearing in some British publications, based on high water of ordinary spring tides.
HIGHER HIGH WATER (HHW)
The higher of the two high waters of any tidal day. The single high water occurring daily during periods when the
tide is diurnal is considered to be a higher high water. (See Figure II-5-16.)
HIGHER LOW WATER (HLW)
The higher of two low waters of any tidal day. (See Figure II-5-16.)
HIGHEST ASTRONOMICAL TIDE (HAT)
The highest level of water which can be predicted to occur under any combination of astronomical conditions. This
level may not be reached every year.
HINDCASTING
In wave prediction, the retrospective forecasting of waves using measured wind information.
HINTERLAND
The region lying inland from the coast. Also the inland area served by a port.
HISTORIC EVENT ANALYSIS
Extreme analysis based on hindcasting typically ten events over a period of 100 years.
HOLOCENE
An epoch of the QUATERNARY period, from the end of the PLEISTOCENE, about 8,000 years ago, to the present
time. Syn: Recent.
HOMOPYCNAL FLOW
A condition in which the outflow jet from a river or coastal inlet and the water in the receiving basin are of the same
density or are vertically mixed.
HOOK
A spit or narrow cape of sand or gravel which turns landward at the outer end; a RECURVED SPIT.
HOPPER DREDGE
Self-propelled floating plant which is capable of dredging material, storing it onboard, and transporting and placing
the material at a specified disposal site. Often used to dredge inlets and then deposit the material along the open coast or
offshore.
HORIZONTAL CLOSURE METHOD
Construction of a dam by dumping the materials from one or both banks, thus constricting the channel progressively
laterally until the dam is closed. This method is also known as end dumping and point tipping
HURRICANE
An intense tropical cyclone in which winds tend to spiral inward toward a core of low pressure, with maximum
surface wind velocities that equal or exceed 33.5 m/sec (75 mph or 65 knots) for several minutes or longer at some points.
TROPICAL STORM is the term applied if maximum winds are less than 33.5 m/sec but greater than a whole gale (63 mph or
55 knots). Term is used in the Atlantic, Gulf of Mexico, and eastern Pacific.
HURRICANE PATH or TRACK
Line of movement (propagation) of the eye through an area.
Appendix A Glossary of Coastal Terminology
A-37
Previous Page
