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SHIP-SINKING MONSTER WAVES REVEALED BY ESA SATELLITES
European Space Agency.<ul> ^ | 21 July 2004

Posted on 07/25/2004 12:36:29 AM PDT by Yosemitest

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To: Yosemitest
See Seich Wave Calculator

Seiching is the formation of standing waves in water body, due to wave formation and subsequent reflections from the ends. These waves may be incited by earthquake motions (similar to the motions caused by shaking a glass of water), impulsive winds over the surface, or due to wave motions entering the basin. The various modes of seiching correspond to the natural frequency reponse of the water body.

In this example, a rectangular basin (of infinite width) with given length and depth is seiching in accordance with the mode that you specified (greater than zero). The period of seiching (T) is determined by finding the correct length wave that will fit in the basin for the given water depth (based on linear water wave theory). The percent refers to the difference between the seiching period predicted by the dispersion relationship versus that usually used: shallow water theory.

(For shallow water theory, the seiching period is given by twice the basin length (l) divided by the modal number (n) and the speed of a shallow water wave (which depends on the water depth h)

As an example, try a basin of length 100 m, a depth of 20 m, and a mode number of two. Note that the water surface motion is out of phase with the velocities (shown with white lines). Also notice that the water motions do not have the elliptical orbits as progressive waves do (as in the Linear Kinematics applet). Under a node (no displacement of the water surface), the velocity is always horizontal, while under an antinode (max. displacement), the velocity is vertical. Further, this example (with quite a large water depth) gives quite a discrepancy between the linear theory result of the applet and the shallow water theory.

In the figure, you will notice that the number of modes corresponds to the number of nodal points (points of no motion of the water surface).

There are an infinite number of seiching modes possible, from the lowest (mode 1) to infinity. The period of oscillation decreases with mode number. Realistically, the lower modes probably occur in nature, as frictional damping affects the higher modes preferentially (higher frequency).

The seiching calculations for linear theory are given in Chapter 4 and 5 of Dean and Dalrymple, Water Wave Mechanics for Engineers and Scientists, World Scientific Press.)

21 posted on 07/25/2004 10:23:42 AM PDT by boris (The deadliest weapon of mass destruction in history is a Leftist with a word processor)
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To: boris

But you would have to spell it:-Remonstorate.


22 posted on 07/25/2004 10:42:02 AM PDT by ijcr (Age and treachery will always overcome youth and ability.)
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To: SunkenCiv

wow


23 posted on 07/25/2004 11:10:17 AM PDT by y2k_free_radical (ESSE QUAM VIDERA-to be rather than to seem)
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To: expat_panama

"Reporters, surfers, and normal people look and a wave and think of the height as being from the top to the bottom -- makes sense but that can turn a '29-metre' wave into a '58-metre' wave."

Missleading at it's best!

I brought nback a 38' sailboat from the Istmus of Catalina to San Pedro in a whole gale that had been blowing for 3 days and the trough to peak of the waves was 50-70' which in a storm isn't that unusual in the Catalina channel.

It was a pretty exciting trip, the 25 miles was covered in an hour and 46 minutes, almost power boat speed.


24 posted on 07/25/2004 11:16:42 AM PDT by dalereed
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To: Yosemitest

Shackleton survived such a massive wave on his small boat trip to S. Georgia. Damage from a 1400 foot splash, after a landslide in Alaska, was reported on the Mega-Tsunami TV show on (?) Discovery channel.


25 posted on 07/25/2004 1:55:58 PM PDT by JohnBovenmyer (I)
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To: Yosemitest

bump


26 posted on 07/25/2004 2:04:45 PM PDT by VOA
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To: y2k_free_radical
:') Thanks for the "wow'. :'D
see Civ's favorites incl Books, Magazines, Movies, Music

27 posted on 07/25/2004 5:13:39 PM PDT by SunkenCiv (Unlike some people, I have a profile. Okay, maybe it's a little large...)
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To: Yosemitest

"King" waves we call them... known to pluck fishermen off high cliffs on the west coast of Australia. They even have signs posted..."Beware of King Waves".


28 posted on 07/25/2004 5:19:24 PM PDT by Principled
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To: Yosemitest

If Bush had supported the Kyoto Treaty, these waves would never happen. /sarcasm


29 posted on 07/25/2004 5:22:20 PM PDT by rintense (Free the Soxdox!)
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To: Yosemitest
two large ships sink every week on average

If I owned one of those two ships I would just beach it and try to sell it for scrap. Every week? That has to be beyond annoying.

30 posted on 07/25/2004 5:23:59 PM PDT by RightWhale (Withdraw from the 1967 UN Outer Space Treaty and establish property rights)
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To: ijcr; Yosemitest
I can't spell either

http://www.freerepublic.com/focus/f-news/1177972/posts

goon = gonna

31 posted on 07/25/2004 8:07:40 PM PDT by dc27
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To: SunkenCiv; Grampa Dave; SierraWasp; Carry_Okie; Boot Hill; SoCal Pubbie
I need to think about moving from the Beach, 25 feet above Sea Level is only about 8 meters..
32 posted on 07/25/2004 9:16:35 PM PDT by Ernest_at_the_Beach
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To: Ernest_at_the_Beach
Or, jack up the house a little and put it on an old barge...
33 posted on 07/25/2004 9:55:18 PM PDT by SunkenCiv (Unlike some people, I have a profile. Okay, maybe it's a little large...)
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To: Yosemitest

Ship-sinking monster waves revealed by ESA satellites
European Space Agency | 7/21/04

Posted on 07/22/2004 10:25:27 PM PDT by uglybiker
Hollywood fantasy? Tidal wave disaster is just waiting to happen
The Guardian Unlimited | August 10, 2004 | Ian Sample

Posted on 08/11/2004 5:57:52 PM PDT by pepsi_junkie

34 posted on 08/12/2004 9:13:37 AM PDT by SunkenCiv (Unlike some people, I have a profile. Okay, maybe it's a little large...)
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To: Principled
They even have signs posted..."Beware of King Waves".

How can they beware of them? By the time they see one coming, it's probably too late to run very far.

35 posted on 08/12/2004 9:20:54 AM PDT by Mr. Jeeves
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To: Mr. Jeeves

right- beware of standing too near the edge of the cliffs... just in case ya know!


36 posted on 08/15/2004 4:19:49 PM PDT by Principled
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Not a ping, just a catastrophism topic added to the catalog.
Please FREEPMAIL me if you want on, off, or alter the "Gods, Graves, Glyphs" PING list --
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37 posted on 04/16/2005 10:06:46 PM PDT by SunkenCiv (FR profiled updated Monday, April 11, 2005. Fewer graphics, faster loading.)
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38 posted on 06/24/2011 3:34:29 PM PDT by SunkenCiv (Thanks Cincinna for this link -- http://www.friendsofitamar.org)
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Note: this topic is from 7/22/2004.



39 posted on 06/24/2011 3:36:18 PM PDT by SunkenCiv (Thanks Cincinna for this link -- http://www.friendsofitamar.org)
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· GGG managers are SunkenCiv, StayAt HomeMother, and Ernest_at_the_Beach ·
· join list or digest · view topics · view or post blog · bookmark · post a topic · subscribe ·

 
 Antiquity Journal
 & archive
 Archaeologica
 Archaeology
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 Bronze Age Forum
 Discovery
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Just updating the GGG info, not sending a general distribution.

To all -- please ping me to other topics which are appropriate for the GGG list.
 

· History topic · history keyword · archaeology keyword · paleontology keyword ·
· Science topic · science keyword · Books/Literature topic · pages keyword ·


40 posted on 06/24/2011 3:39:57 PM PDT by SunkenCiv (Thanks Cincinna for this link -- http://www.friendsofitamar.org)
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