marks in the mud left by groundings

dylanwinter

dylanwinter

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Joined
28 Mar 2005
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Location
Buckingham
www.keepturningleft.co.uk
Dear East Coasters

I love the mud -

I was wondering how long marks last that are left by boats going aground and then pouring on the engine revs to get off.

While sailing at the top of the Alde I went aground by Troublesome Reach - three tides later the marks were still there - and I had not really used a lot of engine power

you do see some astonishingly large trenches excavated by big boats



I do feel bad because I have spoiled the aesthetic of the perfect glistening surface - but perhaps I should also worry about the environmental damage I am doing

Dylan


 
Not quite the East Coast.

Does this count? The River Humber.

I remember locking out of the River Ancholme (South Ferriby) lock about 3 hours after HW one weekend in my old Swift 18, keel fully down. I cut the channel a little bit and left a nice groove through the pristine, glistening mud. Having been told about it by the lock keepers I looked the following weekend and could still see my groove!

It is very gloopy stuff!
 
think positive Dylan. Just consider of all the little crustaceans which would starve if the East Coast Fleet did not plough up the richly inhabited mud.


And if you want to consider environmental damage of a massive scale, look at the gouges "keel marks" left by million ton icebergs around the continental shelf !

http://www.americanscientist.org/issues/pub/2008/5/icebergs-of-the-southeast

"On the Rockall Bank, keel marks are observed over an area of c. 6000 km2, to maximum water depths of 500 m in the south and 600 m in the west; they are present on about 10% of the seabed between 200-500 m WD. Furrows are generally smaller (1-6 m deep), possibly due to different sediment properties." from http://www.agu.org/
 
disturbance can be goo

sarabande said:
think positive Dylan. Just consider of all the little crustaceans which would starve if the East Coast Fleet did not plough up the richly inhabited mud.


And if you want to consider environmental damage of a massive scale, look at the gouges "keel marks" left by million ton icebergs around the continental shelf !

http://www.americanscientist.org/issues/pub/2008/5/icebergs-of-the-southeast

"On the Rockall Bank, keel marks are observed over an area of c. 6000 km2, to maximum water depths of 500 m in the south and 600 m in the west; they are present on about 10% of the seabed between 200-500 m WD. Furrows are generally smaller (1-6 m deep), possibly due to different sediment properties." from http://www.agu.org/
Click to expand...

good point

I am sure that some of the sea birds and seals benefit from bringing crustacea and worms to the surface

a short term benefit

it does appear that some of these marks may be around for a week or more

very interesting

Dylan
 
I suppose we could leave little labels on them "Dylan woz 'ere, Sept 2010", then we could all share in each other's misfortunes.
On the other hand, perhaps not - I'd use up quite a few during the course of a season...
 
There but for the grace of God...............

Cantata said:
I suppose we could leave little labels on them "Dylan woz 'ere, Sept 2010", then we could all share in each other's misfortunes.
On the other hand, perhaps not - I'd use up quite a few during the course of a season...
Click to expand...

I thank whoever thought of lift keels and bilge keels everytime I have a near miss! It must be a sinking feeling in a deep keel etc to know you are going to be stuck at some god awful angle for a tide or so! Especially so if there is a slug of a boat nearby at a level angle with an owner who has certain opinions!

Exhibit 1 my Lu'd! KTL 45 my Lu'd. About 6 minutes in my Lu'd! You can clearly hear the defendent commenting on the poor sailing ability of deep keelers my Lud!

Guilty! Your sentance is to spend 6 months on a motor boat taking all the abuse thrown at you from good sailing folk. Take him down!
 
On the basis of our experience up the River Brede at Rye, they last about a week. If you make a slice of about a foot deep with a bilge keel.
Should have been loads of water after the dredging! Well that's always my excuse.
 
I confess to having left a long deep furrow along the north side of Shotley Spit on Friday. Helpfull comments from the boat less than half a boat length to windward "you'll be aground", did he tack away to let me off the mud..... hmmmm.
 
dylanwinter said:
Dear East Coasters

I love the mud -

I was wondering how long marks last that are left by boats going aground and then pouring on the engine revs to get off.

While sailing at the top of the Alde I went aground by Troublesome Reach - three tides later the marks were still there - and I had not really used a lot of engine power

you do see some astonishingly large trenches excavated by big boats



I do feel bad because I have spoiled the aesthetic of the perfect glistening surface - but perhaps I should also worry about the environmental damage I am doing

Dylan


If you still in Wells next the Sea ask the Skipper of the Albatross about going aground, I bet the marks are still there.
Click to expand...
 
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