by neufer » Tue May 08, 2012 1:54 pm
joelwellwater wrote:
The moon had a big effect at the beach, it was really high tide with huge waves. We really scared that time, but we amaze and watch the moon. It was a big WOW!, it was huge. I wonder if what are the werewolves doing that time XD
![Smile :)](./images/smilies/icon_smile.gif)
The moon is ~2.4 denser than the sun so lunar quadrupole tidal effects are nominally ~2.4 stronger.
(The volume of similar apparent sized objects goes as
the cube of their distance;
whereas, the quadrupole forcing goes as
the inverse cube of their distance.
Hence, the relative quadrupole forcing of the sun & moon only depends upon their relative densities.)
The moon is ~7% closer than normal so it's quadrupole tidal effects are ~ 22% stronger (i.e., 1.07
3).
So the total tidal effects of a full perigee moon are ~ ( 1 + 2.4 x 1.22 )/2.4 ~ 64% stronger than normal.
However,
the maximal "spring" tides should follow the maximal forcing event by 2 to 3 days:
http://en.wikipedia.org/wiki/Tide wrote:
<<The semi-diurnal range (the difference in height between high and low waters over about half a day) varies in a two-week cycle. Approximately twice a month, around new moon and full moon when the Sun, Moon and Earth form a line (a condition known as syzygy) the tidal force due to the sun reinforces that due to the Moon. The tide's range is then at its maximum: this is called the spring tide, or just springs. It is not named after the season but, like that word, derives from the meaning "jump, burst forth, rise", as in a natural spring.
When the Moon is at first quarter or third quarter, the sun and Moon are separated by 90° when viewed from the Earth, and the solar tidal force partially cancels the Moon's. At these points in the lunar cycle, the tide's range is at its minimum: this is called the neap tide, or neaps (a word of uncertain origin).
Spring tides result in high waters that are higher than average, low waters that are lower than average, 'slack water' time that is shorter than average and stronger tidal currents than average. Neaps result in less extreme tidal conditions. There is about a seven-day interval between springs and neaps.>>
[quote="joelwellwater"]
The moon had a big effect at the beach, it was really high tide with huge waves. We really scared that time, but we amaze and watch the moon. It was a big WOW!, it was huge. I wonder if what are the werewolves doing that time XD :)[/quote]
The moon is ~2.4 denser than the sun so lunar quadrupole tidal effects are nominally ~2.4 stronger.
(The volume of similar apparent sized objects goes as [u]the cube[/u] of their distance;
whereas, the quadrupole forcing goes as [u]the inverse cube[/u] of their distance.
Hence, the relative quadrupole forcing of the sun & moon only depends upon their relative densities.)
The moon is ~7% closer than normal so it's quadrupole tidal effects are ~ 22% stronger (i.e., 1.07[sup]3[/sup]).
So the total tidal effects of a full perigee moon are ~ ( 1 + 2.4 x 1.22 )/2.4 ~ 64% stronger than normal.
However, [color=#00AF00]the maximal "spring" tides should follow the maximal forcing event by 2 to 3 days[/color]:
[quote=" http://en.wikipedia.org/wiki/Tide"]
[float=right][img3="[b][color=#00AF00]maximal "spring" tides should follow the maximal forcing event by 2 to 3 days[/color][/b]"]http://upload.wikimedia.org/wikipedia/commons/thumb/d/d5/Tide_schematic.svg/500px-Tide_schematic.svg.png[/img3][/float]
<<The semi-diurnal range (the difference in height between high and low waters over about half a day) varies in a two-week cycle. Approximately twice a month, around new moon and full moon when the Sun, Moon and Earth form a line (a condition known as syzygy) the tidal force due to the sun reinforces that due to the Moon. The tide's range is then at its maximum: this is called the spring tide, or just springs. It is not named after the season but, like that word, derives from the meaning "jump, burst forth, rise", as in a natural spring.
When the Moon is at first quarter or third quarter, the sun and Moon are separated by 90° when viewed from the Earth, and the solar tidal force partially cancels the Moon's. At these points in the lunar cycle, the tide's range is at its minimum: this is called the neap tide, or neaps (a word of uncertain origin).
Spring tides result in high waters that are higher than average, low waters that are lower than average, 'slack water' time that is shorter than average and stronger tidal currents than average. Neaps result in less extreme tidal conditions. There is about a seven-day interval between springs and neaps.>>[/quote]