How do they log steep slopes?
Steep Slope Logging/ Tethered Logging Logging or felling trees on slopes using a winch line for traction assistance of one or more machines on slopes steeper than typical for mechanized logging equipment.
What is tethered logging?
Tethered logging systems utilize cable winch systems on harvesters, feller bunchers, forwarders, loaders, and skidders to stabilize and assist equipment operations on steep slopes. The cable system allows the equipment to operate on slopes that would normally be considered unsafe for equipment or damaging to soils.
What is a steep terrain?
Steep slopes are legally defined as hillsides having a 15 foot, or greater, vertical rise over 100 feet of horizontal run, or 15% slope (Figure 1).
How does a logging Skyline work?
All skyline systems contain a skyline. The mainline is the line that runs from the tower to the carriage. This cable pulls the carriage back to the landing. The haulback is used in downhill operations and where the line slope is less than 20% and the carriage requires assistance to get into the unit.
What is a yarder in logging?
A yarder is piece of logging equipment that uses a system of cables to pull or fly logs from the stump to a collection point. It generally consists of an engine, drums, and spar, but has a range of configurations and variations, such as the swing yarder.
What is a steep slope in math?
In math, steeper means bigger so the slope of that line is bigger than the slope of the second skater’s line.
What’s a mountain slope?
[′mau̇nt·ən ‚slōp] (geography) The inclined surface that forms a mountainside.
What does the word steep meaning?
Adjective. steep, abrupt, precipitous, sheer mean having an incline approaching the perpendicular. steep implies such sharpness of pitch that ascent or descent is very difficult. a steep hill a steep dive abrupt implies a sharper pitch and a sudden break in the level.
Is there such a thing as steep slope logging?
While not considered to be steep slope logging, the poor soil, especially during high rainfall in winter combined with the 30-35% slopes in isolated parts of the cut blocks were significantly reducing the effectiveness and productivity of the skidders.
What are tethered logging systems and how do they work?
Tethered logging systems are not new, having been utilized in New Zealand on the steep (and similar) terrain there. The systems themselves aren’t utilizing any dramatically new technology either. In tethered systems, a winch has been fitted to the back of a piece of equipment such as a harvester or a forwarder.
Can Starks timber harvest on steep slopes?
Before the leveler, the Department of Natural Resources (DNR) had only allowed Starks Timber to harvest on slopes up to a 40 percent incline. Starks had to prove they could safely go steeper.
How has logging equipment evolved over time?
However, modern logging equipment has quickly evolved with the introduction of Tigercat six-wheel skidders and leveling track shovel loggers. Now the opportunity exists for ground-based harvesting systems to be used in steeper terrain that was previously the domain of the traditional cable yarding systems.