ChrisE
Well-Known Member
This story made me think that we could do the same with Portland Bill....
Sea tunnel
- Thread starter ChrisE
- Start date
BlackJacksGaff
Well-Known Member
So how would it work ?
Would it have a lock at each end ? I imagine there could be quite a flow through it a certain times of tide without any form of control
Would it have a lock at each end ? I imagine there could be quite a flow through it a certain times of tide without any form of control
ChrisE
Well-Known Member
I dunno, I reckon with about 5 knots of tide on the ebb, you could get a bore running down the tunnel and you then surf through well above hull speed. The question is which light signals would you use for vessel constained by bore. On second thoughts, parahandy or claymore would probably know....
Twister_Ken
Well-Known Member
"the world's first tunnel for ships and boats."
Obviously, no one at Mutter Boot Monthly is aware of the tunnels on various canal systems around Europe.
Obviously, no one at Mutter Boot Monthly is aware of the tunnels on various canal systems around Europe.
saskia
Well-Known Member
As well as many inland ones on the canals - one about 5kms on the Canal du Nord which takes sizeable barges, tankers etc - there's also the one at the end of the Rhone to Marseille canal, which takes pretty large sea-going vessels so far as I know.
Twister_Ken
Well-Known Member
And the Corinth Canal is more like an open-topped tunnel!
Dyflin
Well-Known Member
Some pretty pics here:
Nice video of typical weather from here:
http://www.youtube.com/watch?v=5T8z2jx03UQ
Nice video of typical weather from here:
http://www.youtube.com/watch?v=5T8z2jx03UQ
Norman_E
Well-Known Member
The oldest canal tunnel appears to be the Sapperton tunnel, dating from 1789.
Evadne
Well-Known Member
Typical Norway weather...
ChrisE
Well-Known Member
Coo, the tunnel is impressive. The weather didn't look that bad to me, I reckon that the Vikings must left Norway and it is now populated by hairdressers and failing C&W singers.
Seriously, well as serious as I'm going to be today, I've been round the headland at Stat and whilst it's a bit rough, it doesn't have Portland Bill tides and if anyone is thinking of doing the passage north from Bergen, if you've sailed in the Channel then Stat will hold no terrors for you.
Seriously, well as serious as I'm going to be today, I've been round the headland at Stat and whilst it's a bit rough, it doesn't have Portland Bill tides and if anyone is thinking of doing the passage north from Bergen, if you've sailed in the Channel then Stat will hold no terrors for you.
Dyflin
Well-Known Member
I haven't been around it myself, but have several family members and friends who have and I know it's treated with utmost respect in Norway and according to batmagasinet.no 100 people have lost their lives there in the last 100 years.
The seas get very confused as can be seen from this image:
And if the seas don't get you, the RAF have been known to have a go /forums/images/graemlins/wink.gif
On Sept. 30-1943 the costal steamer 'Sanct Svithun' was between Vossa and Bukholmen near Stadt, southward bound in heavy weather when she at around 19:00 was attacked by machine gun fire and bombs from 6 British aircraft. She received several direct hits and was set ablaze. The captain and the pilot attempted to beach her on the west side of Kobbeholmen (off Ervik), and were able to place her bow on a submerged rock, but the stern part was sinking in the heavy swells. Her entire midships section was on fire and the heat was intense. People at Ervik, who were busy harvesting potatoes in the fields saw what was happening, and ran to their boathouses wanting to help. 12 people in 3 large rowboats headed towards the ship and were able to save several from the water, as well as from a raft.
One of Sanct Svithun's able seamen jumped into the sea and with great difficulty managed to climb up on Kobbeholmen where he fastened the hawser which was then used by many people to get to safety. They in turn were rescued by the rowboats; as soon as there was a break in the tall swells a couple of people would jump from the steap knoll and into one of the boats. After a while Sanct Svithun slid off and sank. The rescue operation continued until it turned dark, and about 20 survivors had to spend the night there, until other, smaller boats returned early the following morning to pick up the rest of the cold, shipwrecked people. The last person to be rescued was the captain, who had also been the last to leave the ship. Later that day it became clear that 78 or 79 had been saved, while 24 Norwegian passengers, 19 crew and between 10 and 20 German soldiers died (numbers vary according to source - another source says: 22 or 26 passengers died, as well as 10-12 Germans).
A possible reason for the bombing of Sanct Svithun could be that she had had 50 German soldiers on board at first. However, these had disembarked when she arrived Ålesund earlier that day (they later travelled south on Havda).
The seas get very confused as can be seen from this image:
And if the seas don't get you, the RAF have been known to have a go /forums/images/graemlins/wink.gif
On Sept. 30-1943 the costal steamer 'Sanct Svithun' was between Vossa and Bukholmen near Stadt, southward bound in heavy weather when she at around 19:00 was attacked by machine gun fire and bombs from 6 British aircraft. She received several direct hits and was set ablaze. The captain and the pilot attempted to beach her on the west side of Kobbeholmen (off Ervik), and were able to place her bow on a submerged rock, but the stern part was sinking in the heavy swells. Her entire midships section was on fire and the heat was intense. People at Ervik, who were busy harvesting potatoes in the fields saw what was happening, and ran to their boathouses wanting to help. 12 people in 3 large rowboats headed towards the ship and were able to save several from the water, as well as from a raft.
One of Sanct Svithun's able seamen jumped into the sea and with great difficulty managed to climb up on Kobbeholmen where he fastened the hawser which was then used by many people to get to safety. They in turn were rescued by the rowboats; as soon as there was a break in the tall swells a couple of people would jump from the steap knoll and into one of the boats. After a while Sanct Svithun slid off and sank. The rescue operation continued until it turned dark, and about 20 survivors had to spend the night there, until other, smaller boats returned early the following morning to pick up the rest of the cold, shipwrecked people. The last person to be rescued was the captain, who had also been the last to leave the ship. Later that day it became clear that 78 or 79 had been saved, while 24 Norwegian passengers, 19 crew and between 10 and 20 German soldiers died (numbers vary according to source - another source says: 22 or 26 passengers died, as well as 10-12 Germans).
A possible reason for the bombing of Sanct Svithun could be that she had had 50 German soldiers on board at first. However, these had disembarked when she arrived Ålesund earlier that day (they later travelled south on Havda).
ChrisE
Well-Known Member
Of course, you're right and I'll be really serious for a second. It has a fearsome reputation a bit like the Bill and based on similar circumstances. The seas around that part of the coast can, in heavy, usually wintertime, storms be extremely dodgy. You have the combination of a oceanic depths shoaling up near a serious lee shore and some tidal effects that make Stat somewhere you'd rather not be.
Indeed I've heard stories of big (>100') fisihng vessels being lost a bit further up the coast where, in a winter storm, a combination of huge waves and troughs 'removed' the sea from beneath a boat in 20m of water cracking the hull and ship almost instantly foundering....
However, during normal sailing conditions during the summer, say up to F5-6, if you keep out of the shoal areas it is not a problem.
I rather like the idea of the Hurgirutte ferries going through a tunnel, tho.
Indeed I've heard stories of big (>100') fisihng vessels being lost a bit further up the coast where, in a winter storm, a combination of huge waves and troughs 'removed' the sea from beneath a boat in 20m of water cracking the hull and ship almost instantly foundering....
However, during normal sailing conditions during the summer, say up to F5-6, if you keep out of the shoal areas it is not a problem.
I rather like the idea of the Hurgirutte ferries going through a tunnel, tho.
JackFrobisher
Well-Known Member
The idea sounds fine however I can just imagine some beardy insisting on tacking through to avoid using the old iron tops'l.
ParaHandy
Well-Known Member
it'll be the Old Bill yer meaning tae avoid .. efter orra yon guff youse spouted at HOG aboot how wonderful yer diesel heater wus fer keeping warm in norway "instant starting ..", "clean .." ... hmm ... the fact that we hud tae evacuate the boat becos orra fug from it must hae escaped your mind, eh?!
Thistle
Well-Known Member
Don't know about the seas but I'm confused by the image: can someone explain, please?
Dyflin
Well-Known Member
Blue for sea, green (yellow?) for land. /forums/images/graemlins/tongue.gif
Thistle
Well-Known Member
Ho! Ho! Ho! And what about the black lines and the red arcs?
Dyflin
Well-Known Member
Black lines are general wave patterns for the period studied and red circles are worst affected areas.
Thistle
Well-Known Member
Thanks! Now I think I understand it! So, waves predominently from SW being refracted by shallow water giving less predictable wave directions and wave interference, particularly in the circles? Interesting that some focal points to the SW of the chartlet are not circled.
Alfie168
Well-Known Member
I'm getting distant echoes of a Goon Show episode where they built a canal across the Sahara desert.... to avoid potential loss of life in a sinking, they decided it would be safer not to fill it with water.
The tunnel exit reminds me of a storm drain I know in the Yorkshire Dales on the river Nidd.
Impressive though
Tim
The tunnel exit reminds me of a storm drain I know in the Yorkshire Dales on the river Nidd.
Impressive though
Tim
