International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)

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Term No.Term Name/Term DescriptionAction
1311
Neap tides
Exceptionally low tides that occur twice each month when the earth, sun and moon are at right angles to each other.
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2005
Tideway
A channel in which the tide runs; also, a rush of tidal water through a channel or stream.
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2006
Tide land
Land which is inundated during flood tide.
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2007
Tide head
The head of the stretch of land up to which the influence of the tide is felt or the utmost limit of the land coming within the zone of influence of the tide......
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2008
Tide
The periodic rising and falling of the water that results from the gravitational attraction of the moon and sun acting upon the rotating earth. The term tide should not be used to designate the horizontal movement of water which is the tidal current......
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2010
Solar day
The interval between two successive transits of the sun`s centre over the same meridian.
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2011
Lunar day
The interval between two successive transits of the moon`s centre over the same meridian.
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2012
Tide day
The interval between the arrival of any two consecutive high waters of the direct tide (or of the opposite tide) at any given place, its average length being 24 hours 51 minutes......
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2013
Diurnal tides
Tides requiring a full day to complete their cycle, i.e. only one high and one low water in each lunar day.
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2014
Semi-diurnal tides
Tides requiring approximately one-half lunar day to complete their cycle, that is, two high water and two low waters in each lunar day; predominating type of tide throughout the world is semi-diurnal......
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2015
Mixed tides
Those which are preponderantly semi-diurnal at some times and diurnal at others, according to the declination of the moon......
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2016
Spring tide
Maximum tide following the second and fourth quarters of the moon, that is, the new and full moon (occurring every two weeks). At these times (called sizigy) the forces of the sun and the moon are combined......
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2017
Neap tide
A tide occurring near the time of the quadrature of the moon with the sun. The neap tidal range is usually 10 to 30 per cent less than the mean tidal range......
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2020
Apogean tides
The decreased range tides occurring at a time when the moon is in apogee.
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2021
Perigean tide
Tides with increased range which occur when the moon is in the perigee.
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2022
Flood tide, or Rising tide
Tides during a period between low water and the following high water.
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2023
Ebb tide
Tides during a period between high water and following low water.
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2024
Slack water, or Slack tide
Tide water during the period where there is no horizontal motion of water at the surface.
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2025
Equatorial tide
The tide occurring when the moon is on, or closest to the plane of the earth`s equator.
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2026
Tropic tide
The tide occurring semi-monthly when the effect of the moon`s maximum declination is greatest.
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2027
Duration of tide, Duration of ebb tide Duration of flood tide
Duration of flood tide or a rising tide is the interval of time from low water to following high water; and duration of the ebb tide or falling tide is the interval of time from high water to following low water. Together, they cover a period of 12.42 hours for a semi-diurnal tide; the duration of the flood and ebb tides is approximately 6.21 hours.....
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2032
Amplitude of the tide
The semi-range of the tide.
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2035
Low water of ordinary spring tides (LWOST)
A tidal datum appearing in some British publications, based on low water of ordinary spring tides.
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2036
Mean tide level, or Half-tide level
The plane, or surface, that is exactly half way between high water and mean low water. Because of the lack of symmetry of the tidal curve, this is not exactly the same as the mean sea level......
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2038
High water line of tide
Intersection of the plane of mean high water with the shore.
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