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28 Cards in this Set

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  • Back
mixed tide
A complex tidal cycle, usually with two high tides and two low tides of unequal height per day.
tidal tatum
The reference level (0.0) from which tidal height is measured.
Long-wavelength shallow-water wave caused by rapid displacement of water. See also seismic sea wave.
Pendulum-like rocking of water in an enclosed area; a form of standing wave that can be caused by meteorological or seismic forces, or that may result from normal resonance excited by tides.
high tide
The high water position corresponding to a tidal crest.
storm surge
An unusual rise in sea level as a result of the low atmospheric pressure and strong winds associated with a tropical cyclone. Onrushing seawater precedes landfall of the tropical cyclone and causes most of the damage to life and property.
dynamic theory of tides
Model of tides that takes into account the effects of finite ocean depth, basin resonance, and the interference of continents on tide waves.
tidal current
Mass flow of water induced by the raising or lowering of sea level owing to passage of tidal crests or troughs. See also ebb current; flood current.
low tide
The low water position corresponding to a tidal trough.
seismic sea wave
Tsunami caused by displacement of the Earth along a fault. (Earthquakes and seismic sea waves are caused by the same phenomenon.)
Periodic short-term change in the height of the ocean surface at a particular place, generated by long-wavelength progressive waves that are caused by the interaction of gravitational force and inertia. Movement of Earth beneath tide crests results in the rhythmic rising and falling of sea level.
tidal bore
A high, often breaking wave generated by a tide crest that advances rapidly up an estuary or river.
equilibrium theory of tides
Idealized model of tides that considers Earth to be covered by an ocean of great and uniform depth capable of instantaneous response to the gravitational and inertial forces of the sun and moon.
neap tide
The time of smallest variation between high and low tides occurring when Earth, moon, and sun align at right angles. Neap tides alternate with spring tides, occurring at two-week intervals.
flood current
Water rushing into an enclosed harbor or bay because of the rise in sea level as a tide crest approaches.
mean sea level
The height of the ocean surface averaged over a few years time.
slack water
A time of no tide-induced currents that occurs when the current changes direction.
diurnal tide
A tidal cycle of one high tide and one low tide per day
solar tide
Tide caused by the gravitational and inertial interaction of the sun and Earth.
tidal range
The difference in height between consecutive high and low tides.
spring tide
The time of greatest variation between high and low tides occurring when Earth, moon, and sun form a straight line. Spring tides alternate with neap tides throughout the year, occurring at two-week intervals.
standing wave
A wave in which water oscillates without causing progressive wave forward movement. There is no net transmission of energy in a standing wave.
tidal wave
The crest of the wave causing tides. Another name for a tidal bore. (Not a tsunami or seismic sea wave.)
ebb current
Water rushing out of an enclosed harbor or bay because of the fall in sea level as a tide trough approaches.
meteorological tide
A tide influenced by the weather. Arrival of a storm surge will alter the estimate of a tide's height or arrival time; as will a strong, steady onshore or offshore wind.
lunar tide
Tide caused by gravitational and inertial interaction of moon and Earth.
The line or point of no wave action in a standing pattern. See also amphidromic point.
semidiurnal tide
A tidal cycle of two high tides and two low tides each lunar day, with the high tides of nearly equal height.