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

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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?


The tidal cycle

What Causes the Tides?

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


The tidal cycle

Changes in the angle of the Moon result in changes in the heights of high and low tides


The tidal cycle

MOON

LUNAR DAY:

24 Hrs + 50 min

Result:

2 high tides

every 12 hrs + 25 min

2 low tides

every 12 hrs + 25 min


The tidal cycle

TIDAL VARIABILITY: Lunar Tides > Solar Tides

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

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


The tidal cycle

Low Tide @ the Overlook 1.6 ft. below MLLW


The tidal cycle

High Tide @ the Overlook 7.0 ft. above MLLW


The tidal cycle

Low Tide @ Sloughside Pilings 1.6 ft. below MLLW


The tidal cycle

High Tide @ Sloughside Pilings 7.0 ft. above MLLW


The tidal cycle

Low Tide @ Sloughside point 1.6 ft. below MLLW


The tidal cycle

High Tide @ Sloughside Point 7.0 ft. above MLLW


The tidal cycle

Low Tide @ the Overlook 1.6 ft. below MLLW


The tidal cycle

High Tide @ the Overlook 7.0 ft. above MLLW


The tidal cycle

Low Tide @ the Observation Deck 1.6 ft. below MLLW


The tidal cycle

High Tide @ the Observation Deck 7.0 ft. above MLLW


Locations and tide information for photos

Locations and tide information for photos

  • 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)


The tidal cycle

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

TidesOnline

www.tidesonline.nos.noaa.gov


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