The tidal cycle
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The Tidal Cycle. What forces cause the rising and falling of the ocean tides? How often does the tide change? What environmental factors influence the height of the tides? What do the tidal flats look like at high tide? What do the tidal flats look like at low tide?. What Causes the Tides?

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The tidal cycle
The Tidal Cycle

  • What forces cause the rising and falling of the ocean tides?

  • How often does the tide change?

  • What environmental factors influence the height of the tides?

  • What do the tidal flats look like at high tide?

  • What do the tidal flats look like at low tide?


What Causes the Tides?

Gravitational Pull from the Moon and Tidal Inertia Results in Tidal Wave that Rotates Around the Earth



MOON heights of high and low tides

LUNAR DAY:

24 Hrs + 50 min

Result:

2 high tides

every 12 hrs + 25 min

2 low tides

every 12 hrs + 25 min


TIDAL VARIABILITY: Lunar Tides > Solar Tides heights of high and low tides

Spring Tides = Alignment of Moon & Sun / High Amplitude Exchange

Neap Tides = Misalignment of Moon & Sun / Low Amplitude Exchange


Low Tide @ the Overlook 1.6 ft. below MLLW heights of high and low tides


High Tide @ the Overlook 7.0 ft. above MLLW heights of high and low tides










Locations and tide information for photos
Locations and tide information for photos MLLW

  • Low Tide (lower low) on June 7, 2004 predicted -1.6 @ 10:35am at Coos Bay mouth using OSU/Hatfield Marine Science Center Dock, Yaquina Bay, OR

  • High Tide (lower high) on June 7, 2004 predicted 7.0 @ 5:35pm at Coos Bay mouth using OSU/Hatfield Marine Science Center Dock, Yaquina Bay, OR

  • Photos taken June 7, 2004 at South Slough National Estuarine Research Reserve, Charleston, OR along the shoreline mid-estuary accessed from the Estuary Study Trail System. Low tide photos taken between 10:45am – 11:15am (photographer - Tom Gaskill)

  • High tide photos taken between 5:45pm – 6:15pm (photographers - Tom & Gabriel Gaskill)


Real-time, Predicted, and Historic Tides are Available On-line:

TidesOnline

www.tidesonline.nos.noaa.gov


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