High Tides in Venice

General discussion
Post Reply
DaveWalsh
Posts: 123
Joined: Sat Oct 26, 2013 9:37 am

High Tides in Venice

Post by DaveWalsh » Sun Nov 17, 2019 6:55 pm

Apparently Venice is experiencing unprecedented high tides this last few days causing immense damage in a spot where high water is a regular occurrence, so there must be something very unusual going down.
First research stop was the tide tables for Galway, which maxed at 5.0 a few days ago, on say Wednesday and Thursday, the usual 36 hours after the full moon which was last Tuesday. Folks, 5.0 is nothing in Galway. You need 5.6 or 5.7 before the dreaded "sandbag" word is heard. Even then you need other factors complicateding things.
But Venice is still getting hammered and this is Sunday, they are back to 4.6 in Galway (which actually is OHW, ordinary high water, the level that legally determines the foreshore from contiguous privately owned land) so what is going on?
  • Is it low pressure ? Remember the rule "an inch is a foot", i.e. an inch of mercury is a foot of water, meaning 2.5cm less of mercurial pressure equates to 30cm of tide height.
  • Is it wind? I can't see wind was the major factor.
Knotman, where are you when you are needed most in our hour of peril?
Advise us, advise us now.
DWalsh

knotman
Posts: 123
Joined: Sat Oct 26, 2013 9:37 am

Re: High Tides in Venice

Post by knotman » Tue Nov 19, 2019 9:38 pm

Believe it or not, Mr Walsh, I was in Venice this weekend observing first hand.
I have a picture which will answer all your questions as to the real cause of all this flooding.
.Will post ASAP.

PS: the locals were most worried about the wind direction.

Knotman .

knotman
Posts: 123
Joined: Sat Oct 26, 2013 9:37 am

Re: High Tides in Venice

Post by knotman » Tue Nov 19, 2019 9:48 pm

Look up SEICHE. Standing waves {rocking motion} set up in elongated bays, closed at one end eg, Fundy , Adriatic,


Post Reply