Chapter 9: Tides
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Tide | periodic rise & fall of ocean resulting from gravitational interactions of moon, sun, & earth
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| Tidal range | difference between high & low tide water lines
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| Ebb flow | Seaward tidal flow from high to low tide
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| Flood flow | Landward tidal flow from low to high tide
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| Slack water | Time of no flow between ebb and flood
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| Diurnal tide | one high & one low tide are experienced each day
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| Semidiurnal tide | two high & two low tides of approximately equal altitudes occur daily
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| Mixed tide | two strongly unequal high & low tides occur daily
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| Spring tide | tide occurring twice a month in which greatest tidal range is experienced (occurs during new & full moon)
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| Neap tide | tide occurring twice a month when the tidal range is the smallest
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| Microtidal | coast with <2m tidal range
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| Mesotidal | Type of coast with 2-4m tidal range
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| Macrotidal | Type of coast w/ >4m tidal range
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| Gravitational force | force of attraction between masses
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| Centrifugal force | An apparent "center-fleeing force" felt by objects experiencing uniform circular motion as a result of inertial resistance to centripetal acceleration
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| Coriolis force | Apparent force caused by rotation of the earth, responsible for the deflection of surface currents to the right in the northern hemisphere & to the left in southern hemisphere
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| Equilibrium theory of tide formation | Two tidal bulges are produced on opposite sides of the earth; the bulge facing the moon is produced largely by the moon's gravitational effect, whereas the bulge on the opposite side is produced by centripetal acceleration (centrifugal force)
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| Apogee | when distance between the moon & the earth is 407,000km; causes slightly lower tides
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| Perigee | when distance between the moon & the earth is 357,000km; causes higher tides
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| Equinoxes | Sept. 21, March 21. Spring tides are highest b/c moon, earth, and sun are in straight line
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| Solstices | June 21, Dec. 21; spring tides are lower b/c moon, earth, and sun are NOT aligned
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| Perihelon | Location of sun during winter (for northern hemisphere); 148,500,000km from earth
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| Aphelion | location of sun during summer (for northern hemisphere); 152,200,000km from earth
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| Amphidromic system | Region under the influence of a single rotating kelvin wave
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| Amphidromic point | Nodal point around which the kelvin wave rotates
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| Cotidal lines | lines connecting points experiencing high tide at the same time
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| Corange lines | lines connecting points having the same tidal range
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| Harmonic method of tide prediction | The observed tide is produced from a number of components (partial tides) having a given period, amplitude, & phase that can be represented by a sine wave
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| M2 | Principal lunar tidal component (12.42 hrs)
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| S2 | Principal solar tidal component (12.00 hrs)
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| K1 | Luni-solar diurnal tidal component (11.00 hrs)
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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