TIDES The EBB and FLOW. Tides are affected by... Gravitational pull of the moon Gravitational pull...
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Transcript of TIDES The EBB and FLOW. Tides are affected by... Gravitational pull of the moon Gravitational pull...
![Page 1: TIDES The EBB and FLOW. Tides are affected by... Gravitational pull of the moon Gravitational pull of the sun Centrifugal force of earth as it rotates.](https://reader035.fdocuments.net/reader035/viewer/2022062315/5697c0081a28abf838cc6680/html5/thumbnails/1.jpg)
TIDESThe EBB and FLOW
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Tides are affected by . . .
• Gravitational pull of the moon
• Gravitational pull of the sun
• Centrifugal force of earth as it rotates
• Position of the sun & moon
• Angle of orbit of moon around earth
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The Earth . . .•Makes one revolution around the sun per year
•Rotates on its axis about once per day
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The Moon. . .•Revolves around the Earth at an angle 28.5o to the Earth’s equator
•Revolves once every 29.53 days
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A TIDE is. . .•The alternate rising and falling of sea level as a result of the gravitational forces exerted on the Earth by the sun and moon
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Flood Tide:
•A rising tide, moving inward
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EbbTide:
•A falling tide, moving outward
![Page 8: TIDES The EBB and FLOW. Tides are affected by... Gravitational pull of the moon Gravitational pull of the sun Centrifugal force of earth as it rotates.](https://reader035.fdocuments.net/reader035/viewer/2022062315/5697c0081a28abf838cc6680/html5/thumbnails/8.jpg)
Two competing forces produce tides . . .
•Gravitational between moon and Earth
•Centripetal between sun and Earth
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Tidal Range:•The difference in height between successive high and low tides
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Spring Tides-High Highs & Low Lows
• Spring tides-
during a new and full
moon, when earth, sun
& moon line up-
produces highest of high
and lowest of low tides
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Neap TidesMedium Highs & Lows
• Neap tides- during the
1st & 3rd quarter moons,
when the earth, sun, and
moon are at right angles
(work against each other)
- Produces small high
and low tides.
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Equatorial & Tropic Tide:
•Caused by angle and pull of moon at different positions to the Earth
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Diurnal Tides:•One high and one low per day (one cycle)
DAY ONE DAY TWO
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Semidiurnal Tides:•Two highs and two lows per day (two cycles)
DAY ONE DAY TWO
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Tides are modified by
•Land•Weather•Coriolis force
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Lunitidal Interval:•The lag in time between when you expect the tide and when it actually occurs
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Tidal Bore:•A true tidal wave that moves up a river
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Tide tables• The moon circles the earth every
24 hours 50 minutes. Tides occur 50 minutes later each day.
• Tides can be easily calculated in order to ensure safe navigation in areas like harbors
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Put on your thinking cap!
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What can happen to a ship if a seaman
fails to check his tide table?
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It could get stuck at low tide!
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How can knowing the time of high and low tide aid in fishing?
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High tide carries fish in, they get trapped
at low tide.
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At which tide level would you have the
best luck beachcombing?
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LOW TIDE!
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Why are tides important to
estuaries, bays, and marshes?
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Tides bring fish in to spawn and for food.
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Are tides a source of energy?
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They have been harnessed to produce
energy in power plants!