the tidal cycle what forces cause the rising and falling of the ocean tides? how often does the tide...
TRANSCRIPT
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
Changes in the angle of the Moon result in changes in the 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
MOON
TIDAL VARIABILITY: Lunar Tides > Solar 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
High Tide @ the Overlook 7.0 ft. above MLLW
Low Tide @ Sloughside Pilings 1.6 ft. below MLLW
High Tide @ Sloughside Pilings 7.0 ft. above MLLW
Low Tide @ Sloughside point 1.6 ft. below MLLW
High Tide @ Sloughside Point 7.0 ft. above MLLW
Low Tide @ the Overlook 1.6 ft. below MLLW
High Tide @ the Overlook 7.0 ft. above MLLW
Low Tide @ the Observation Deck 1.6 ft. below MLLW
High Tide @ the Observation Deck 7.0 ft. above MLLW
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)
Real-time, Predicted, and Historic Tides are Available On-line:
TidesOnline
www.tidesonline.nos.noaa.gov