Tides Bay of Fundy at high tide The rising of Earths ocean surface caused by the tidal forces of the Moon and the Sun acting on the oceans httpswwwyoutubecomwatchvOP0cpXpw8yk httpswwwyoutubecomwatchvEnDJ6XpGfo ID: 805877
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Slide1
Bay of Fundy at low tide
Tides
Bay of Fundy at high tide
The rising of Earth's ocean surface caused by the tidal forces of the Moon and the Sun acting on the oceans.
https://www.youtube.com/watch?v=OP0cpXpw8yk
https://www.youtube.com/watch?v=EnDJ6_XpGfo
Slide2A tide is a repeated cycle of sea level changes in the following stages:
1st step
Over several hours the water rises or advances up a beach in the flood tide.
Tidal Cycle
Slide3A tide is a repeated cycle of sea level changes in the following stages:
2nd step
Water reaches its highest level, stops at high water. Tidal currents cease. Called slack water or slack tide. Tide reverses direction and is said to be turning.
Tidal Cycle
Slide4A tide is a repeated cycle of sea level changes in the following stages:
3rd Step
The sea level lowers or falls over several hours during the ebb tide.
Tidal Cycle
Slide5A tide is a repeated cycle of sea level changes in the following stages:
4th Step
The level stops falling at low water. This point is also described as slack tide or turning.
Tidal Cycle
Slide6A tide is a repeated cycle of
sea level changes
Tidal Cycle
A tide is a repeated cycle of sea level changes
Slide7Tides
As the Earth rotates, the moon’s gravity pulls water toward the point on the Earth’s surface closest to the moon.
http://www.onr.navy.mil/Focus/ocean/motion/tides1.htm
Slide8Spring Tides
During new moon and full moon, the sun, moon, and Earth are almost in alignment.
The combined gravity causes higher than normal high tides and lower than normal low tides
Slide9Neap Tides
1st and 3rd quarter moon is at right angles to sun and Earth.
The sun’s pull is at right angle to the Earth, causing lowest height difference between tides
Slide103
rd
Quarter Moon1st Quarter Moon
Slide11Slide12Slide13Slide14Slide15Slide16Slide17Slide18Slide19Slide20Slide21Slide22Slide23Slide24Tidal force
- secondary effect of the force of gravity, responsible for the tides.
The side nearest to the second body experiences a greater force, while the opposite side experiences a lesser force.
Use the Force, Luke..
It occurs because the gravitational force exerted on one body by a second body is not constant across its diameter.
http://www.gly.uga.edu/railsback/Tides/TideHammer01.html
http://www.pbs.org/wgbh/nova/venice/tides.html
Slide25Once a day
Diurnal Tides
- In parts of the northern Gulf of Mexico and Southeast Asia, tides have one high and one low water per tidal day
Slide26Semi-diurnal tides
- two high and two low waters per tidal day. They are common on the Atlantic coasts of the United States and Europe.
Twice a day
Slide27Mixed tides
- where successive high-water and low-water levels change a great deal. In these tides, we have a higher high water and lower high water as well as higher low water and lower low water. The tides around west coast of Canada and the United States are of this type.
Can’t Decide!
Slide28Where on Earth?
Slide29Graphing Tides
Slide30Slide31To calculate a tidal range, subtract the low tide from the high tide.
Minimum Tidal Range = 4.7 feet – 0.6 feet = 4.1 feet
4.7 feet
0.6 feetThe tidal range shown above is the minimum tidal range for this time period. What is the name given to tides such as these?What phases of the moon cause these tides?
Slide32To calculate a tidal range, subtract the low tide from the high tide.
Maximum Tidal Range = 6.1 feet –
(-1.1 foot) = 7.2 feetThe tidal range shown above is the maximum tidal range for this time period. What
is the name given to tides such as these?What phases of the moon cause these tides?6.1 feet- 1.1 feet
Slide33Day
Time
Height (meters) above mean sea levelMonday
6:00 AM1.5 2:00 PM
6.7 10:30 PM1.7
Tuesday
7:30 AM
6.5
5:00 PM
1.9
Wednesday
3:00 AM
6.3
1:30 PM
2.1
Thursday
12:30 AM
6.1
12:30 PM
2.3
12:00 AM
5.9
When do we dock
?
One example of the importance of tides
Channel = 15 meters
Dockside depth = 15 meters
Draft of ship = 12.5 meters
Slide34Wave characteristics
Wavelength
(L): distance between crests
Wave Height
(H) : vertical distance between crest and troughWave Period (T): time for successive waves to pass a fixed point
Slide35Slide36Kiawah
Island
Slide37Slide38Ebb-Tidal Delta
Slide39Slide40Slide41Morris Island
Lighthouse
Coast Guard Station
Slide42