An Analysis of the Operational Time and Productivity in Whole-tree and Cut-to-Length Logging Operation System

This study was conducted to analyze on the operational time and productivities of logging operations in whole-tree logging operation system by tower-yarder and swing-yarder, and in cut-to-length logging operation system by excavator with grapple in order to establish the efficient logging operation system and to spread logging operation technique. In the analysis of operational time, in case of whole-tree logging operation system, the felling time was 46.6 sec/cycle by chain saw, the yarding time was 480.6 sec/cycle by tower-yarder, the yarding time was 287.4 sec/cycle by swing-yarder and the bucking time was 155.14 sec/cycle by chain saw. In case of the cut-to-length logging operation system, the felling and bucking time was 225.65 sec/cycle by chain saw, the cut-to-length extraction time was 4,972 sec/cycle by excavator with grapple, the branches and leaves extraction time was 3,143 sec/cycle by excavator with grapple. The forwarding time was 4,688 sec/cycle by wheel type mini-forwarder, the forwarding time was 2,118 sec/cycle by excavator with grapple and small forwarding vehicle. In the analysis of operational productivities, in case of whole-tree logging operation system, the average felling performance was 57.89 ㎥/day by chain saw, the average yarding performance was 20.3 ㎥/day by tower-yarder, 31.55 ㎥/day by swing-yarder respectively, the average bucking performance was 20.3 ㎥/day by chain saw. In case of the cut-to-length logging operation system, the average felling and bucking performance was 11.96 ㎥/day by chain saw, the average cut-to-length extraction performance was 34.75 ㎥/day by excavator with grapple, the average branches and leaves extraction performance was 37.66 ㎥/day by excavator with grapple, the average length of operation road construction was 73.8 m/day by excavator with grapple. The average forwarding performance by wheel type mini-forwarder and the average forwarding performance by excavator with grapple and small forwarding vehicle was 15.73 ㎥/day and 65.03 ㎥/day, respectively.