To Liam and members of the Forest List,
>>>>>>>
______________________________ Reply Separator _________________________________
Subject: Optimal Bucking Systems
Author: "LIAM MALONE (FORESTRY) PG" <LMALONE@AGRICULTURE.UCD.IE> at tawa
Date: 9/16/96 12:58 PM
Some were developed, initially at least, as purely instructional tools.
Others were intended for use at stump or skidsite to assit
motor-manual bucking i.e BUCK (Sessions et al, 1988) and HW-BUCK
(Pickens et al, 1993). The MARVL system(s) (Deadman, 1990;
Deadman and Goulding, 1979) and the programs
compiled by Eng et al (1986) and Sessions et al (1989b) were devised
to predict optimal product output from whole stands based upon pre-harvest
inventory and log specifications, and with volume constraints.
I would appreciate any information (literaure references) and
opinions on the current status and level of use of the above systems.
Of particular interest:
Whether or not AVIS (Geerts and Twaddle, 1984; Twaddle and Goulding, 1989)
and VISION(modified) (Lembersky and Chi, 1984) were adopted for actual use
on-site like BUCK (Sessions et al, 1988) and HW-BUCK (Pickens et
al, 1993)
>>>>>>>
MARVL - a Method for the Assessment of Recoverable Volume by Log grades is
the standard operational inventory method in New Zealand, applied to
virtually all the cut of 17 million m3. It is used from mid -rotation
onwards, a typical inventory schedule would be mid- rotation, five years
before harvesting, and 18 months to one year before harvesting, in a 30
year rotation. It is being used increasingly in Australia, some 15
organisations. Contact NZ Forest Research Institute, Rotorua, NZ
AVIS is also used operationally in New Zealand as a PC based "value
recovery" auditing program, or implemented on a hand-held field computer,
the Husky, mainly for on-site auditing and training. All the major forestry
companies in NZ have some form of "optimum value recovery" programme
applied to their logging crews. A recent development is to implement a
new version of AVIS, renamed "LISA", on Hagloff computerised callipers,
with the objective of determining the optimal bucking pattern operationally
on the skid-site. (Contact Wayne Gibbons at the Logging Industry Research
Organisation, LIRO, Rotorua, NZ.)
>>>>>>>>>>>
If the programs of Eng et al (1986) and Sessions et al (1989b) received
practical implementation and are used in the way MARVL is.
>>>>>>>>>>
Eng et al's system was tried briefly by Fiji Pine Ltd, but replaced by MARVL.
Some of the ideas are however, now being revisited, particularly the
methodologies for deriving log values for unconstrained optimal bucking when
there are forest-wide capacity/sales constraints. This research is being
conducted by Paul Cossens and Glen Murphy, NZ Forest Research Institute, Rotorua
Chris Goulding,
NZ Forest Research Institute,
Sala Street, Private Bag 3020
Rotorua, New Zealand
Goulding@fri.cri.nz
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