UKTC Archive

RE: critical wind-speeds for tree failure

Subject: RE: critical wind-speeds for tree failure
From: Simon Major
Date: Oct 12 2017 13:01:37
Hi Rupert, similar threads currently running on the other forum (the 
four-lettered tree risk one), I'd just posted similar to below.

Interestingly, UK Met Office wind warnings are risk-based with probability of 
failure and consequence both taken into account. They don't use wind speed 
thresholds alone to trigger a warning.  They take into account local 
populations, rush hour traffic, holidays, one-off events etc.

So e.g. a yellow warning during a festival weekend will be at a much lower 
wind speed than a midwinter day with normal regional activity.

UK yellow warnings - be aware and plan ahead.
Amber - get prepared to change your plan. 
Red – take action now.

I'd be inclined to act on similar lines. i.e. a midwinter night I probably 
wouldn't head out to close a wood during Jim's force 8, but I'd be bricking 
it if I knew the local fun-run was going through the wood all morning in 
force 8. And somewhere in between the (four-lettered system) oh why not (it's 
in the free download) - QTRA's 'weather related targets' comes in handy. What 
is the occupation going to be in the conditions you think that tree is / 
those trees are going to fail in?

Btw - there is also an audio recording of the AA presentation, maybe only 
meant for paid up attendees.

Cheers.
Simon

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
[mailto:uktc-request@xxxxxx.tree-care.info] On Behalf Of Rupert Baker
Sent: 12 October 2017 11:23
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: critical wind-speeds for tree failure

Hi collective,

I googled this term when puzzling over a request to suggest a critical wind 
speed above which a woodland should be closed;  it came up with 

https://www.trees.org.uk/Trees.org.uk/media/Trees-org.uk/Documents/Conferenc
e17/WED-08-Prof-Steffen-Rust.pdf which appear to be a powerpoint presentation 
from this year.  Now the main address is the AA;  anyone know which seminar 
or W.H.Y. this came from?

The authors/presenters are Steffen Rust, Lothar Gocke (with an umlaut on the
o) and Franziska Jachning

 

All the best

 

Rupert




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