Frédéric Mothe, Gilles Le Moguédec, Gérard Nepveu

A logging module for oak connected to the Fagacées model
Simulation du billonnage de chêne en sortie
du modèle de croissance Fagacées
Frédéric Mothe, Gilles Le Moguédec,
Gérard Nepveu, Emmanuel Bucket
LERFOB : Laboratoire d'Etude des Ressources Forêt-Bois
UMR INRA-ENGREF, 54280 Champenoux, France
Objective
Improve the quality assessment of the modelled trees (stands | scenarios...)
by considering logging strategy and target products
=> simulate the logging process
using the stem taper description delivered by the growth models
Pp3
Fagacées
oak specific
logging module
Work initiated in collaboration with
Emmanuel Bucket (CTBA)
"Modélisation des bilans "environnement"
et "produits" de sylvicultures contrastées
de chêne sessile"
(convention de coopération INRACTBA 2003-2004)
and others...
generic logging module
Capsis 2006
in progress
2
Operating principle of the oak logging module
Logging oriented toward a list of products :
tranchage
sorted by
priority order
sliced veneers
plot
merrains
selection using the data
available in Fagacées :
growth rings
sapwood /
heartwood
aubier / duramen
knotty core
coeur branchu
staves
(wine barrels)
unedged sawing
(furniture/joinery)
bark
sawing
LVL
crown base
LVL
particle boards
sciage
industriel
fire wood
Capsis 2006
3
Logging rules for oak
Product
priority
number
length
stump
1
1
0.3 m
slicing
2
1
1 - 2.2 m
∅MED ≥ 50 cm
∅MED ≤ 140 cm
∅CB ≤ 10 cm
staves
3
2
1.1 m
∅MED ≥ 45 cm
(∅DUR - ∅CB) / 2
≥ 9 cm
furniture
4
-
3-5m
∅FB ≥ 25 cm
(∅CB / ∅DUR)² ≤
13%
sawing
5
-
3-5m
∅FB ≥ 25 cm
-
LVL
6
-
1.5 m
∅FB ≥ 18 cm
∅CB ≤ 12 cm
∅DUR ≥ 14 cm
particle
boards
7
3
2 - 2.2 m
∅FB ≥ 7 cm
-
firewood
8
-
0.5 - 1 m
∅FB ≥ 7 cm
-
top log
9
-
-
Capsis 2006
diameter
-
-
wood quality
-
4
Algorithm used for processing one tree
Begin
Tree taper
Logging rules
stump
slicing
staves
furniture
sawing
LVL
particle
firewood
top log
H=0
product = stump
search for the
max valid length
=L
L=0?
Capsis 2006
5
Algorithm used for processing one tree
Begin
Logging rules
stump
slicing
staves
furniture
sawing
LVL
particle
firewood
top log
H=0
product = stump
search for the
max valid length
=L
next
product
H=H+L
no
H = HTot ?
yes
L=0?
no
log cutting
yes
Fin
Capsis 2006
output
files
6
Simulation outputs
Tree data file
Log data file
DBH x product data file
volumes
weights
to be completed (prices...)
Capsis 2006
7
Generic logging module GeoLog (experimental)
Products anonymous (P1, P2...)
custom products => derived product & panel class (e.g. Fagacées)
Logging rules
using basic stem geometry
(min diameter, min length...)
max diameter of branched core
min diameter of heartwood
max diameter of juvenile wood
custom rules
=> TreeRadius_cmProvider ()
=> TreeCrownBaseHeightProvider ()
=> adapt GeoLog class (e.g. Pp3)
(TreeXXProvider ?)
=> derived product & panel class (e.g. Fagacées)
Outputs volumes by compartments
weights
=> wood density model (TreeWoodDensityProvider ?)
adapt GeoLog class
other
Capsis 2006
=> derived export class
8
Minimal requirements for using GeoLog
<= TreeRadius_cmProvider ()
(required)
<= TreeCrownBaseHeightProvider ()
(optional)
Capsis 2006
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Requirements for customising products and rules
<= derived product class
<= custom parameter
<= default settings
custom rules
<= derived panel class
Capsis 2006
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Merci !
Capsis 2006
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the end
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