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How much does the water level change by?
3 ft.
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high timde
water comes in
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What are two tidal currents
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flood tide
water comes in
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What does the water do to switch between high and low tides?
stop and reverse
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When does slack water happen?
when tides reverse
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Tidal range
difference in water level between high and low tide
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tidal period
time between consecutive high tides
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What is the tidal period here?
~12 hrs
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What are boston's tides like?
- 2 tides a day
- semidiurnal
- regular
- same height
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What are the Gulf of Mexico's tides like?
- 24 hours to complete a tidal tide
- diurnal tide
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What type of tides does most of the world have?
mixed tides
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mixed tides
2 highs and 2 lows of a day, but different heights
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How long does a spring/neap cycle take to complete
2 weeks
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What are tides on a longer scale called?
spring/neap
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Spring
largest tidal range
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What are the 4 tides in a mixed tide system called
- lower low tide
- higher high tide
- lower high tide
- higher low tide
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tides
- rhythmic rise and fall of sea level
- very long and regular shallow water waves
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standing wave
a wave that oscillates vertically, no progressive movemnt
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What causes a standing wave?
- ride waves, reflected by coast
- amplification of tidal range
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What is an example of a place that gets a standing wave?
Bay of Fundy
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Where do tidal bores exist?
low gradient river
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What is the longest estuary affected by ocean tides?
Amazon River
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What did Sir Isaac Newton say about tides?
moon and gravity
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What is the moons gravity doing?
pulling all parts of the earth toward it
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Gravitational forces
- proportional to product of masses
- inversely proportional to squarTide generating forcese of seperation distance
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Tide generating forces
Bary center between moon and earth
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Bary center
- always between moon and earth
- experiences centripetal acceleration
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Centripetal force
all experiencing the same
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resultant forces
difference between centripetal and gravitational force
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tide generating forces are
horizontal components
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How long is the lunar day
12 hours and 25 min
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When do we get spring tides?
New and full moon
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When do we get neap tides?
at the 1st and the 3rd quarter
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syzygy
all 3 (earth, sun, and moon) lined up
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Force is proportional to
M/ r3
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