The grabbing forces of log grapples were modeled and analyzed mathematically under operating conditions when grabbing logs from compact log piles and from bunch-like log piles. The grabbing forces are closely related to the structural parameters of the grapple, the weight of the grapple, and the…
Keywords: grabbing forces, log grapples, logging, forest operations, equipment manufacturing
Source: International Journal of Forest Engineering. 16(1): 77-85.
Clearcutting aspen from the upland portion of an upland peatland watershed in north central Minnesota caused snowmelt peak discharge to increase 11 to 143 percent. Rainfall peak discharge size increased as much as 250 percent during the first two years after clearcutting, then decreased toward…
Keywords: floods, land use, peak discharge, Lake States, logging
Source: Water Resources Bulletin. 19(1): 59-67.
Presents the weights and the centers of gravity for the green trees and boles of balsam fir, white spruce, and red pine for use in the design of harvesting equipment.
Keywords: equipment, logging, harvesting, design, engineering
Source: Research Paper NC-75. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station
Much of the nonindustrial, private forest land in the Northeast is characterized by small diameter trees with low volume. Conventional harvesting systems used in logging these stands generally results in submarginal economic returns. Often, small-scale harvesting systems have economic advantages in…
Keywords: logging, time studies, production rates
Source: In: Proceedings of the 12th annual meeting of the council on forest engineering, Implementing techniques for successful forest operations; 1989 August 29-30; Coeur d'Alene, Idaho. 61-66
Estimating ground-based timber harvesting systems production with an object oriented methodology was investigated. The estimation model developed generates stands of trees, simulates chain saw, drive-to-tree feller-buncher, swing-to-tree single-grip harvester felling, and grapple skidder and…
Keywords: logging, timber harvesting, forest operations, cost, production, validation
Source: Forest Science. 49(1): 64-76.
Today, there is keen interest in using alternative silvicultural systems like individual-tree selection, group openings and shelterwood because the general public feels these systems are more acceptable than clearcutting. Consequently, due to repeated entries into forest stands and the fact that…
Keywords: Missouri Ozark Forest Ecosystem Project, logging, clearcutting, individual-tree selection
Source: In: Proceedings Society of American Foresters 1999 national convention; 1999 September 11-15; p. 210-222. (1999)
Stand management activites influence (1) tree growth and quality; (2) stand structure, stocking and composition; (3) wildlife and aquatic habitat quality; and (4) long-term site productivity. The cumulative impacts of stand-level treatments affect ecosystem structure and function at the landscape…
Keywords: logging, terrestrial, aquatic habitats, silviculture, stand growth
Source: Forest Research Information No. 177. 1994. pp. 53-65.
The Weak Link hand-held calculator program (HP-41C) quickly analyzes a system for logging production and costs. The production equations model conventional chain saw, skidder, loader, and tandemaxle truck operations in eastern mountain areas. Production of each function of the logging system may be…
Keywords: Harvesting costs, logging, hand-held calculator, timber production, forest engineering
Source: Res. Pap. NE-510. Broomall, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiement Station. 12p.
This program gives the log weight that the skidder can move and gives fuel consumption either in liters or gallons per turn. Slope of the skid trail, skidder weight, and skid distance must be entered into the program.
Keywords: Skidder, load capacity, logging, computer programs, cost estimating, fuel estimating, skidding forces and distances
Source: Res. Pap. NE-537. Broomall, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiement Station. 7p.
Bioassessment is a useful tool to determine the impact of logging practices on the biological integrity of streams and wetlands. Measuring biota directly has an intuitive appeal for impact assessment, and biota can be superior indicators to physical or chemical characteristics because they can…
Keywords: Best management practices, BMP, forestry, logging, invertebrates, macrophytes, algae, fish, amphibians, reptiles, birds
Source: Water, Air, and Soil Pollution 00: 1-17