1. TIDES
The rise and low life of waters

2. What is Tides?
 Are motions caused by the gravitational
attraction between earth, moon, and sun.
 The periodic motion of the waters of the
sea, caused by the attractive forces of the
moon and the sun.

3. Tides and the Moon

4. Tides and the Moon
 Lunar tides

5. Tides and the Moon
 Lunar tides
 occur at every 12 hours and 48 minutes,
alternating between Moon side and far side
high tides with lunar low tides in-between as
reference.

6. Tides and the Moon
 Lunar tides
 occur at every 12 hours and 48 minutes,
alternating between Moon side and far side
high tides with lunar low tides in-between as
reference.
 Water level highs and lows lag the tide
causing forces by 1-3 hours. Large amounts
of water must flow long distances around
uneven land masses

7. Tides and the Sun

8. Tides and the Sun
 Solar tides
 Smaller and occur at different times than
lunar tides
 The solar high waters are about 12 hrs.
apart as the earth rotates on its axis
 The solar semidaily tide is only 46% that of
the lunar semidaily tide.

9. Combined effects of Sun and Moon

10. Combined effects of Sun and Moon
 Spring Tides

11. Combined effects of Sun and Moon
 Spring Tides
are the highest tides we have which
occur twice each month during the full
moon (when the sun and the moon are in line with the earth)

12. Combined effects of Sun and Moon
 Spring Tides
are the highest tides we have which
occur twice each month during the full
moon (when the sun and the moon are in line with the earth)
 Neap Tides

13. Combined effects of Sun and Moon
 Spring Tides
are the highest tides we have which
occur twice each month during the full
moon (when the sun and the moon are in line with the earth)
 Neap Tides
it is when tides are at their lowest,
occur during the first and third quarter
moon (when the sun and the moon are at right angles)

15. Another kinds of
Tides

16. Another kinds of tides
 Perigean Tides

17. Another kinds of tides
 Perigean Tides
 Like other heavenly bodies, the moon's orbit around
the Earth is elliptical. Once each month, the moon
passes by the Earth at perigee, which is about
30,000 miles closer than at apogee, or the furthest
point in orbit.

18. Another kinds of tides
 Perigean Tides
 Like other heavenly bodies, the moon's orbit around
the Earth is elliptical. Once each month, the moon
passes by the Earth at perigee, which is about
30,000 miles closer than at apogee, or the furthest
point in orbit.
 When spring tides and perigee align, the moon's
extra-strong pull results in unusually high tides,
known as perigean tides. Perigean tides take place
at intervals that are slightly longer than six months,
according to the Woods Hole Oceanographic
Institution.

19. Another kinds of tides
 Diurnal Tides

20. Another kinds of tides
 Diurnal Tides
 If one high tide and one low tide take place in
a lunar day, it's known as a diurnal tide.
Diurnal tides create 24-hour, 50-minute tidal
periods.

21. Another kinds of tides
 Diurnal Tides
 If one high tide and one low tide take place in
a lunar day, it's known as a diurnal tide.
Diurnal tides create 24-hour, 50-minute tidal
periods.
 Oceans in partially enclosed basins, such as
the Caribbean and the Gulf Coast of the U.S.
often experience diurnal tides.

22. Another kinds of tides
 Semi-Diurnal Tides

23. Another kinds of tides
 Semi-Diurnal
 When two high and two low tides of the same
height take place in a lunar day, it's called a
semi-diurnal tide.


24. Another kinds of tides
 Semi-Diurnal
 When two high and two low tides of the same
height take place in a lunar day, it's called a
semi-diurnal tide.
 Semi-diurnal tidal periods are 12 hour and 25
minutes long. Most coastlines experience
semi-diurnal tides.

25. Another kinds of tides
 Mixed tides

26. Another kinds of tides
 Mixed tides
 where successive high-water and low-water
stands differ appreciably .

27. Another kinds of tides
 Mixed tides
 where successive high-water and low-water
stands differ appreciably .
 In these tides, we have a higher high water
and lower high water as well as higher low
water and lower low water.

29. THANK YOU
AND GOD BLESS
US!
By Rochelle D. Bernas