[CANUFNET] Tree and wind
JHashemi at oakville.ca
JHashemi at oakville.ca
Wed Jan 30 08:24:47 EST 2008
Hi Ian,
Dr. Kim Coder's researches published by University of Georgia in 2000 under
" Tree biomechanics Series" is also a comprehensive collection on this
subject.
Here are some of the subjects in this series of articles:
Tree fall distance estimate, Sept 2000
Tree heights and force of fall. Sept 2000
Estimating wind forces on tree crowns, Sept 2000
Critical force for buckling tree stems, Sept 2000.
Check this website for the articles:
www.forestry.uga.edu/warnell/service/library
Jalil Hashemi
Town of Oakville
Jalil Hashemi, R.P.F.,
Certified Arborist
Municipal Tree Protection
Inspector
Forestry Section, Parks & Open
Space Department
jhashemi at oakville.ca
Central Operations Mailing Address:
1140 South Service Road West Town of Oakville
Oakville, Ontario, L6L 5T7 P.O. Box 310, 1225 Trafalgar Road
Tel. (905) 845-6601, Ext: 2855 Oakville, Ontario, L6J 5A6
www.oakville.ca
Fax: (905) 338-4227
"Burleton, Mark"
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[CANUFNET] Tree and wind
01/29/2008 12:40
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Hi Ian . I believe there is recent research by Scott Cullen from ASAC
on wind damage and the work by Claus Mattheck and Helge Breloer during
their initial research published in Arboricultural Association (UK)
journal in the early 90s. I will see if I have copies to be more
specific and get back to you.
Mark Burleton
Ottawa
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Today's Topics:
1. Trees and wind (Ian Wilson)
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Message: 1
Date: Mon, 28 Jan 2008 13:46:19 -0800
From: "Ian Wilson" <IWilson at kelowna.ca>
Subject: [CANUFNET] Trees and wind
To: <canufnet at list.web.net>, <urbNRnet at LIST.TREELINK.ORG>
Message-ID:
<63C8F69A3250564AAAEE162EF144217F0D0B0EE1 at kelexchange.city.kelowna.bc.ca
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Hi all,
I've been approached by a meteorologist who is looking at trying to link
wind speeds to thresholds, or a range of thresholds, where tree damage
is commonly seen. I passed on a good review article by Dr. Kim Coder on
the subject,
http://www.urbanforestrysouth.org/resources/library/storm-wind-loads-on-
trees/at_download/file_name
but he's also looking for input from other foresters or arborists.
If you have some observations or data on the subject, please pass them
on to me, and I will forward them. Below is some more information on
what he is looking for.
thanks,
Ian Wilson
City of Kelowna
--------------------------------------------------------------
Currently I am working on a project that is trying to link impacts
to wind speeds. Specifically the Meteorological Service of Canada is
trying to come up with some impact statements to go along with the
meteorological numbers that we use in our worded forecasts and warnings.
This recognizes that fact that forecasts that give the wind speed in
km/h are not easily translated by members of the public into the impacts
that the wind may have. Since wind has a big impact on the City of
Kelowna Parks dept' I wonder if you could help us out by letting us know
that the impacts are for various wind speeds. What type of damage would
you associate with a 50-70 km/h wind, a 70-80 km/h/ wind, a 90-100 km/h
wind and winds greater than 100 km/h (gusts included). Do you have any
sense of this or have you ever tried to quantify it? Perhaps you have
an idea based on the number of crews that have to be called in to clear
fallen trees and debris. Perhaps it is not just wind speed that is
important, but considerations such as wind direction, how wet it has
been, whether trees are in leaf or not etc.
To use an example we have heard from municipal parks people that
tree branches start to break off with winds gusting to 70 km/h. The
storm of November 12th 2007 produced wind of 90 km/h in Penticton
uprooting mature trees and causing widespread power outages and the
evacuation of some neighbourhoods. Any information that you have along
on the impacts that certain speeds of wind have would be greatly
appreciated.
If you have any questions or please do not hesitate to give me a call.
Gabor Fricska
Sector Development Meteorologist
Environment Canada
National Services Office - Natural Resources
3140 University Way
Kelowna BC
Tel (250) 491-1517
Fax (250) 491-1506
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