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Key Terms for Second Test
Oceanography is Evil
31
Environmental Studies
Undergraduate 1
04/23/2012

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Term
The tide generating force of a body is proportional to the inverse of the distance between the body and the Earth to this power.
Definition
3
Term
How often does a spring tide occur
Definition
every two weeks
Term
What is the period of a lunar diurnal tide?
Definition
24 hours and 50 minutes
Term
Range
Definition
differences in height between consecutive high and low waters
Term
High Tide/ High Water‎
Definition
Maximum Height reached by a rising tide
Term
Low Tide/ Low Water
Definition
Lowest elevation reached by a falling tide
Term
Tidal Datum
Definition
Mean low water. This is the reference level from which ocean depths and tide heights are measured; the zero tide level. The use of mean low water assures sailors that the water is generally higher than what is marked on the chart
Term
Apogee
Definition
When the moon is furthest away from earth
Term
Perigee
Definition
when the moon is closest to earth
Term
Ebb Tide
Definition
Falling tide; the period of tide between high water and the next low tide
Term
Flood Tide
Definition
the period of the tide between low tide and the next high tide. When the water is rising.
Term
Amphidromic Point
Definition
the point from which the cotidal lines radiate on the chart; the nodal, or low amplitude point for rotary tide
Term
Cotidal lines
Definition
Lines drawn on a chart to mark the location of a tidal crest a set intervals of time
Term
corange lines
Definition
in a rotary tide, lines of equal tidal range about the amphidromic point
Term
Slack Water
Definition
state of a tidal current when its velocity is near zero; occurs when the tidal current changes direction. This is when the tidal currents slow and then reverse. This can be the only time when vessels can safely navigate a narrow channel with swift tidal currents.
Term
Syzygy
Definition
Straight line configuration of three celestial bodies (Sun, Moon Earth)
Term
Spring Tide
Definition
Tides occurring during the times of the full and new moon, when the range of the tides is greatest. Spring tides occur approximately every two weeks.
Term
Neap Tide
Definition
Tides occurring during the first and last quarters of the moon, when the range of the tides is least. This is when the lunar and solar tides are out of phase with one another and are interacting destructively.
Term
Equilibrium Theory of Tides
Definition
Tides are studied as a mathematical ideal in which wave forms behave uniformly in response to the laws of physics. This is a non-rotating, water covered earth.
Term
Dynamic Theory of Tides
Definition
Studies the tides as they actually occur on a rotating earth modified by landmasses and the geography of the ocean basins
Term
Diurnal Tides
Definition
One high water and one low water each day.
Term
Difference between the time period of lunar and solar tides.
Definition
Lunar tides have an extra 50 minutes tacked on because the moon moves and the sun does not.
Term
lunar Semi-diurnal tide has a period of....
Definition
12 hours and 25 minutes
Term
Semi-diurnal tide
Definition
Tide with two high waters and two low waters each day
Term
mixed semi-diurnal tide
Definition
type of tide with large inequalities between the two high waters and two low waters which occur each day. (higher high tide and lower low tide)
Term
Moon's Declination
Definition
The angle between the moon's orbit and the earth's equator
Term
Lunar Day/ Lunar Month
Definition
Time required for the moon to pass from one new moon to another new moon (29 days)
Term
Solar Day
Definition
time period determined by one rotation of Earth relative to the Sun; the mean solar day is ‎twenty-four hours
Term
Tidal Day
Definition
‎24 hours and 50 minutes long. This is because the moon is also moving and therefore the ‎starting point will not be under to moon until the earth turns another 12° (50 minutes)‎
Term
Centripetal Acceleration ‎
Definition
centripetal force - inward-directed force necessary to keep an object moving in a curved path ‎or rotating about an axis.‎
Term
Mesotidal Coast
Definition
The mesotidal coast has a tidal range of between 2 and 4 meters. This is in between the other ‎two classifications of tidal coasts
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