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Further information

 

AAIR Project No PL 94-2392


Example Meta Model Form for EU Project Information Exchange


Source: Roger Dunham, Aberdeen University
DATE: 24/05/96


user_name Roger Dunham
user_organisation Department of FORESTRY,
Aberdeen University,
581 King Street,
Aberdeen,
Scotland
date 24th May 1996
model_name Failure from compression wood
description Describes probability of failure by snapping or overturning depending
on proportion of stem occupied by compression wood
software Excel 5.0
operating_system PC Windows
isumm There are three input paramaters, two of which, height and dbh are
currently redundant, but will probably be used in a future version of
the model.
Porportion of stem occupied by compression wood at breast height
Measured from thin transverse section illuminated to show dark zones
of compression wood.
VALID ONLY FOR Sitka sprucena
ispecfile Tree Height dbh compression wood proportion
1 23.5 28 33
iexpspecfile Height measured in metres, dbh in centimetres and compression wood
percentage in %
ALL DATA IN ONE FILE.
ivar1 Height
ifile1 input.xls
idescr1 Tree height form stump to tip of highest branch or leader,
isensitiv1 Unknown
isensdescr1 none
ivar2 dbh
ifile2 input.xls
idescr2 Tree diameter at beast height.
isensitiv2 Unknown
isensdescr2 none
ivar3 compression wood percent
ifile3 input.xls
idescr3 Proportion of cross section occupied by compression wood
isensitiv3 Unknown
isensdescr3 none
csumm None
(Note from Marianne - Need regression coefficients etc
here in this case)
cspecfile NONE
cexpspecfile n/a
osumm Give probability of fialure by snap, overtuning or remaining undamaged
ospecfile Not currently in file format
oexpspecfile Probability of snap appears in column E, probability of windthrow in column F,
and probability of no damage appears in column G. Column H contains most
probable outcome. Probailities relate to likelihood of damage occurring if a similar storm
occurred again, which originally caused the damage to the stand.
ovar1 snapprob
ofile1 excel spreadsheet model.xls, clumn E
odescr1 Probability of snap
ovar2 throwprob
ofile2 Excel spreadsheet model.xls column F
odescr2 Probability of windthrow
ovar3 standprob
ofile3 Excel spreasheet, model.xls, column G
odescr3 Probability of remaining undamaged
stat_meth compression wood proportion
(Height and dbh will be included in future).
Note from Marianne: what would need to go in here would be
the parameters from any regressions carried out, information
about the statistical relationships etc)
mech_meth n/a
log_meth n/a
scope Limited to Sitka spruce grown in North of England. Develepod on
72 trees in two separet forests which had been badly wind damaged during
winter of 1994/5 Modele should be used cautioulsy in other geographic areas., model is based on a restricted sample, and more data is needed to
add confidence. Assumes that all trees were exposed to similar windloads.
Soil types, silvicultural treatments, provenance etc, have not yet been investigated.
other
copyright DEPARTMENT OF FORESTRY,
UNIVERSITY OF ABERDEEN
contact Dr Roger Dunham