the tidal cycle what forces cause the rising and falling of the ocean tides? how often does the tide...

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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?

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Page 1: 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

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?

Page 2: 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

What Causes the Tides?

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

Page 3: 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

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

Page 4: 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

LUNAR DAY:

24 Hrs + 50 min

Result:

2 high tides

every 12 hrs + 25 min

2 low tides

every 12 hrs + 25 min

MOON

Page 5: 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

TIDAL VARIABILITY: Lunar Tides > Solar Tides

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

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

Page 6: 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

Low Tide @ the Overlook 1.6 ft. below MLLW

Page 7: 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

High Tide @ the Overlook 7.0 ft. above MLLW

Page 8: 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

Low Tide @ Sloughside Pilings 1.6 ft. below MLLW

Page 9: 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

High Tide @ Sloughside Pilings 7.0 ft. above MLLW

Page 10: 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

Low Tide @ Sloughside point 1.6 ft. below MLLW

Page 11: 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

High Tide @ Sloughside Point 7.0 ft. above MLLW

Page 12: 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

Low Tide @ the Overlook 1.6 ft. below MLLW

Page 13: 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

High Tide @ the Overlook 7.0 ft. above MLLW

Page 14: 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

Low Tide @ the Observation Deck 1.6 ft. below MLLW

Page 15: 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

High Tide @ the Observation Deck 7.0 ft. above MLLW

Page 16: 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

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)

Page 17: 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

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

TidesOnline

www.tidesonline.nos.noaa.gov

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