Thesis (MScFor (Dept. of Forest and Wood Science)--University of Stellenbosch, 2010. / ENGLISH ABSTRACT: This study aims to quantify the benefits of implementing an operational
harvesting plan in forest harvesting operations. This is to be achieved by
comparing productivity and costs from unplanned and planned harvesting
operations. The study was conducted on a Pinus radiata plantation owned
by Mountain to Ocean Forestry Company (Pty) Ltd (MTO) located near the
town of Grabouw in the Western Cape Province of South Africa.
MTO conducts harvesting operations using semi-mechanised tree-length
harvesting systems. A wheeled H67 Clark Ranger cable skidder is used to
extract tree-lengths from infield to the landing. Data was obtained both
manually (work study) and from GPS tracking. Choking and dechoking data
was obtained through time and method studies. GPS tracking was used to
measure travel loaded and travel empty times, as well as travel distances
and travel speeds. The aim of using both manual techniques and GPS
tracking was to obtain detailed and spatially accurate information about the
operation. The operating costs were estimated using South African
Harvesting and Transport Costing Model.
Productivity of the newly introduced tagline system (45.97 m³/pmh) exceeded
that of mainline system (37.85 m³/pmhh) by 26%. The unit production cost of
using tagline system (R20.21/m³) was 10% lower than the unit production
cost of using mainline system (R22.54/³3). There were no benefits to be
gained from improving the level of skid trail construction by removal of
logging residue or cutting down stumps to as near the ground level as
possible. A combination of manual (time and method studies) data collection
and GPS tracking provided more detailed and accurate information on the
semi-mechanised harvesting system. / AFRKAANSE OPSOMMING: Hierdie studie beoog om die voordele van die uitvoering van 'n operasionele
inoestingsplan te kwantifiseer. Dit word bereik deur produktiwiteit en kostes
van beplande en onbeplande inoestingswerksaamhede te vergelyk. Die
studie is gedoen in Pinus radiata opstande van Mountain to Ocean Forestry
Company (Pty) Ltd (MTO) naby Grabouw in die Wes-Kaap provinsie van
Suid Afrika.
MTO gebruik semi-gemeganiseerde boomlengte inoestingstelsels in hul
inoestingswerksaamhede. . H67 Clark Ranger wielsleeptrekker met kabel en
wenas is gebruik om boomlengtes van die veld na die pad te sleep. Data is
versamel deur van beide hand (werkstudie) en GPS-opsporing gebruik te
maak. Afhaak en aanhaak data is verkry deur van tyd- en metodestudies
gebruik te maak. Gelaaide en ongelaaide tyd, spoed en afstande is met
behulp van die GPS gemeet. Deur van beide hand en GPS
versamelingsmetodes gebruik te maak, kon omvattende sowel as ruimtelik
akkurate inligting oor die werksaamhede verkry word. Die bedryfskostes is
verkry van die South African Harvesting and Transport Costing Model.
Produktiwiteit van die nuut ingestelde verbindingslynstelsel (45.97 m³/pmh)
het die hooflynstelsel (37.85 m³/pmh) met 26% oorskry. Die
eenheidsproduksiekoste van die verbindingslynstelsel (R20.21/m³) was 10%
laer as die eenheidsproduksiekoste van die hooflynstelsel (R22.54/m³). Daar
was geen voordeel in die verbetering van die sleeppad konstruksie deur afval
te verwyder of stompe nader aan die grondvlak af te sny nie. 'n Kombinasie
van hand (tyd- en metodestudies) dataversameling en GPS-opsporing het
meer akkurate en omvattende inligting oor die semi-gemeganiseerde
inoestingstelsel verskaf.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/5333 |
| Date | 12 1900 |
| Creators | Odhiambo, Benedict O. |
| Contributors | Ackerman, P. A., Pulkki, R. E., University of Stellenbosch. Faculty of Agrisciences. Dept. of Forest and Wood Science. |
| Publisher | Stellenbosch : University of Stellenbosch |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | Unknown |
| Type | Thesis |
| Format | 109 p. : ill. |
| Rights | University of Stellenbosch |
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