Tides lecture part one
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Part one of the Tides notes

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Tides lecture part one Tides lecture part one Document Transcript

  • Tides
  • Description of tides tides - periodic rise and fall of ocean waters
  • Tides are caused by: Main Factor #1: Gravitational pull of the moon and sun Main Factor #2: Centripetal force of the rotating Earth
  • Main Factor #1: Gravitational Pull the gravitational pull of the moon and sun The force of gravity depends on... earth moon sun
  • Main Factor #1: Gravitational Pull Gravitational Force
  • Main Factor #2: Centripetal and Centrifugal Forces
  • Main Factor #2: Centripetal and Centrifugal Forces The earth-moon system revolves around the barycenter. earth moon
  • Main Factor #2: Centripetal and Centrifugal Forces GRAVITATIONAL FORCE CENTRIPET AL GRAVITATIONAL & CENTRIPETAL
  • GRAVITATIONAL & CENTRIPETAL
  • Tidal Patterns Semidiurnal tides- two high and two low per day; Cape Cod, MA (high latitudes) Diurnal tides- one high and one low per day; Mobile, AL (low latitudes) Mixed pattern tides- Two high and two low tides per day BUT with successive high tide levels that are VERY DIFFERENT from each other; Hawaii (mid latitudes)
  • Tidal Patterns Type of tide depends on: Position on the globe Water depth Contour- shape of ocean basins geography of coastlines
  • How do Tides Vary? A tidal range is the difference between levels of ocean water at high tide and low tide. The combined forces of the sun and the moon on Earth produce different tidal ranges.
  • The Bay of Fundy: Site of the world’s largest tidal range Tidal energy is focused by shape and shallowness of bay Maximum spring tidal range in Minas Basin = 17 meters (56 feet)
  • Bay of Fundy High tide Low tide ( hours later) 6
  • Nova Scotia Tides Wolfville, NS (16 m tidal range) Diurnal Tides (one high and one low every 12 hours and 25 minutes
  • Timing the Tides The moon revolves around Earth much more slowly than Earth rotates. High and low tides at that place happen 50 min. later each day.
  • By the time the Earth has completed one revolution (one day), the moon has moved slightly, so the Earth needs to rotate a bit more to catch up with the moon…
  • Tidal Cycles Diurnal Tide: Semi Diurnal Tide: Mixed Tide: 24 hr 50 min cycle 12 hr 25 min cycle 12 hr 25 min cycle
  • Explain to your neighbor A: Why are there two tides on both sides of the Earth? B: Explain why tides do not occur at the same time each day.