Rogue Waves

[zoidberg]

Constructive Interference? Or a 'Rogue Hole'....?

Is this what could have 'nixed' Susie Goodall?
She tells of the 'screaming' of the wind, for hours, and that her Rustler was coping, with the JSD deployed. Then it all went quiet.....

Have a look...

 

[Kukri]

I thought the bridle on her JSD failed?

 

[Ohlin Karcher]

I thought the bridle on her JSD failed?

Yes that's right.

I've been hit by a submarine's wave ( nothing else to create it) and it seemed to be a near-capsizing nightmare in the middle of an otherwise jolly cruise.
It was off North Germany, heading to Helgo with the shipping lanes behind me.
I've had 2 rogue waves just in that spot, in different yachts in different years. Sudden huge terrifyingly short high waves out of nowhere, then back to normal a minute later. Coincidence, maybe.

Someone's got a book out about rogue waves I think Zoidberg.

 

[r_h]

I thought the bridle on her JSD failed?

Correct - as a result I understand the manufacturers of her drogue have now changed from a cow hitch at the outboard end of the bridle to proper splices.

 

[zoidberg]

The question is 'What caused the failure'..... 'How did it come about?'

 

[GHA]

The question is 'What caused the failure'..... 'How did it come about?'

Cos sail in the southern ocean for long you'll be out in some monster waves. Seem to be plenty reports of how quiet it goes in the troughs.

 

[Ohlin Karcher]

What's the deepest reported rogue trough?

 

[Bouba]

It’s also a story of how science was so certain then did a quick about face. And I’m sure the branch of science involved would not be a million miles away from the climatologists who also carry that same certitude today

 

[Deleted member 36384]

It’s been worked out how they form recently, modeled and tested. Google it.

 

[NotBirdseye]

What's the deepest reported rogue trough?

They're still not quite recognized so the research isn't quite there (and I've been surfing for them if you'll excuse the pun). In theory they can be as deep as a rogue wave is high (according the physics on Rogue Wave studies alone) if not a little deeper (gravity ftw). So if you're caught out there with a 15m rogue trough (we're probably talking at least a Force 7/8 there so normal wave height of about 4-8m), you're probably not coming back up and that's not gonna matter whether your boat is allegedly unsinkable or not.

Rogue holes are not the bit before and after a rogue wave (see Three Sisters) those are (I think) trenches, though you may have two elevated waves first and after the hole. It literally is an inverted rogue wave as far as the physics is concerned an you could arguably have a three sisters version (so you could encounter said 15m hole even at a Force 5-6... if nature hates you that much, stay off the water).

 

[Seajet]

What's the deepest reported rogue trough?

I think that's off Durban South Africa, a feature of the ( Agulhas ? ) current is particularly nasty troughs rather than especially high waves - this is mentioned in some editions of Heavy Weather Sailing when the WWII cruiser HMS Edinburgh discovered such a trough the hard way , also thought maybe responsible for the loss of the liner Warratah and various disappearances, and featured in some fanciful novels.

 

[Ohlin Karcher]

Yes I've heard of those troughs, ships literally fall into them and keep going down when they splash into the valley.
There were lots of stories doing the rounds in Grimsby, about one or two trawlers which sank without explanation or time to get on the radio. The explanation was huge quantities of gas, rising up from a hole in the seabed. The rising gas bubbles form a great pillar of bubbles or foam, the ship sails into the mousse and suddenly falls down the vertical tunnel of bubbles until it hits the seabed. Don't know if it's true..but very spooky!

 

[Kukri]

The Ben Line cargo liner Bencruachan fell into a hole off Durban and survived but was slightly bent. 2nd May 1973.

 

[Kukri]

Yes I've heard of those troughs, ships literally fall into them and keep going down when they splash into the valley.
There were lots of stories doing the rounds in Grimsby, about one or two trawlers which sank without explanation or time to get on the radio. The explanation was huge quantities of gas, rising up from a hole in the seabed. The rising gas bubbles form a great pillar of bubbles or foam, the ship sails into the mousse and suddenly falls down the vertical tunnel of bubbles until it hits the seabed. Don't know if it's true..but very spooky!

I had a set of pictures, not taken by me, of a drilling rig doing exactly that. Obviously in her case a gas pocket. The pictures were taken from a supply boat getting the hell out of Dodge at double ring full ahead.

 

[Seajet]

Yes I've heard of those troughs, ships literally fall into them and keep going down when they splash into the valley.
There were lots of stories doing the rounds in Grimsby, about one or two trawlers which sank without explanation or time to get on the radio. The explanation was huge quantities of gas, rising up from a hole in the seabed. The rising gas bubbles form a great pillar of bubbles or foam, the ship sails into the mousse and suddenly falls down the vertical tunnel of bubbles until it hits the seabed. Don't know if it's true..but very spooky!

That's one of the main theories to explain the Bermuda Triangle, I hadn't heard of it happening closer to home, that's really put me off my supper.

 

[jimi]

I blame creamola foam. Loads of cargo ships sunk during the war carrying cargoes of Creamola foam, or even worse, Andrews liver salts. Over time the containers corrode and then theres a great big explosion of foam and down goes the ship.

 

[Kukri]

And another one, the Neptune Sapphire, also 1973, on her maiden voyage, same area, steamed into a hole and ring fractured in way of the bulkhead between hold 1 and hold 2. Towed in.



There is a funny story about this one. The Master was thrown out of bed and immediately looked out of his cabin window... to see the bow of a ship going past. He ran to the wheelhouse and yelled at the OOW «*What the ****?»

To which the officer of the watch replied That was our bow, Sir!

 

[JumbleDuck]

It’s also a story of how science was so certain then did a quick about face. And I’m sure the branch of science involved would not be a million miles away from the climatologists who also carry that same certitude today

Science works on evidence. As soon as there was evidence for rogue waves, science accepted them, and as soon as there was evidence for anthropogenic global warming science accepted that. Eppe si muove, as we scientists say when confronted with wilful stupidity and ignorance.

 

[JumbleDuck]

That's one of the main theories to explain the Bermuda Triangle, I hadn't heard of it happening closer to home, that's really put me off my supper.

Methane clathrates are the suspects, but since there is nothing whatsoever special about the Bermuda Triangle it's not quite clear what they are suspected of. This a cracking good read on the subject:

Meticulous investigation and a very American, dry, laconic style.

 

[jimi]

Science works on evidence. As soon as there was evidence for rogue waves, science accepted them, and as soon as there was evidence for anthropogenic global warming science accepted that. Eppe si muove, as we scientists say when confronted with wilful stupidity and ignorance.

Aye, Galileo knew all about rogue waves.. His real name was actually Leo and as a young man he often would go sailing in his Laser in high winds encountering huge waves and then became known as Gale Leo this became corrupted over time to Galileo cos as he got older he worked more and more in the kitchen. Of course the biggest rogue wave he saw was in St Peters square when the Pope acknowledged his presence.