EM 1110-2-1100 (Change 1)
31 Jul 03
TIDE
The periodic rising and falling of the water that results from gravitational attraction of the Moon and Sun and other
astronomical bodies acting upon the rotating Earth. Although the accompanying horizontal movement of the water resulting
from the same cause is also sometimes called the tide, it is preferable to designate the latter as TIDAL CURRENT, reserving
the name TIDE for the vertical movement.
TIDE, DAILY RETARDATION OF
The amount of time by which corresponding tides grow later day by day (about 50 minutes). Also LAGGING.
TIDE, DIURNAL
A tide with one high water and one low water in a day. (See Figure II-5-16)
TIDE, EBB
See EBB TIDE.
TIDE, FLOOD
See FLOOD TIDE.
TIDE, MIXED
See MIXED TIDE.
TIDE, NEAP
See NEAP TIDE.
TIDE, SEMIDIURNAL
See SEMIDIURNAL TIDE.
TIDE, SLACK
See SLACK TIDE.
TIDE, SPRING
See SPRING TIDE.
TIDE STAFF
A tide gage consisting of a vertical graduated staff from which the height of the tide can be read directly. It is called
a fixed staff when it is secured in place so that it cannot be easily removed. A portable staff is designed for removal from the
water when not in use.
TIDE STATION
A place at which tide observations are being taken. It is called a primary tide station when continuous observations
are to be taken over a number of years to obtain basic tidal data for the locality. A secondary tide station is one operated over
a short period of time to obtain data for a specific purpose.
TIDE, STORM
See STORM SURGE.
TIDE TABLES
Tables which give daily predictions of the times and heights of the tide. These predictions are usually
supplemented by tidal differences and constants by means of which additional predictions can be obtained for numerous other
places.
TIDE, WIND
See WIND TIDE.
A-82
Appendix A Glossary of Coastal Terminology
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