Tides
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Tides. Tides. Tides: the periodic rise and fall of the water level in the oceans and other large bodies of water High tide is when the water level is highest. Low tide is when the water level is lowest. What causes tides?. Gravitational pull of the moon and the sun on the earth.

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Tides

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Tides

Tides


Tides1

Tides

Tides: the periodic rise and fall of the water level in the oceans and other large bodies of water

  • High tide is when the water level is highest.

  • Low tide is when the water level is lowest.


What causes tides

What causes tides?

  • Gravitational pull of the moon and the sun on the earth.

  • When are the highest high tides and lowest low tides (Greatest tidal range)?

  • Answer? Full moon or New Moon.

  • When are the lowest high tides and highest low tides (Lowest tidal range).

  • Answer: First quarter and third quarter moon phases.


Spring and neap tides

Spring and Neap Tides


Tides2

Tides

  • In Chesapeake Bay, we have 2 highs and 2 lows each day.

  • High and low tides occur about 30-50 minutes later each day due to the moon rising and setting about 30-50 minutes later each day.

  • There are 6 hours between high and low tide. Due to moon’s orbit around earth. 24 hours/6 = 4 tides a day.

  • Greatest tidal range is during full and new moon.


Tidal range

Tidal Range

  • Tidal range affected locally by:

    • Shape of ocean basin

    • Size of basin

    • Depth of basin


High and low tide

High and Low Tide


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