SIMYAR: a cable-yarding simulation model.

Abstract

A skyline-logging simulation model designed to help planners evaluate potential yarding options and alternative harvest plans is presented. The model, called SIMYAR, uses information about the timber stand, yarding equipment, and unit geometry to estimate yarding co stand productivity for a particular operation. The costs of felling, bucking, loading, and hauling are not considered. Included are a description of the input requirements for SIMYAR, descriptions of the major algorithms, suggested applications, and a discussion of limitations. A users guide is available as an appendix to this publication.

The SKYTOWER and SKYMOBILE programs for locating and designing skyline harvest units.

“…Other programs in PLANS help planners design highlead yarding units (HIGHLEAD; Twito and others 1987b),lay out preliminary transportation systems (ROUTES; Reutebuch in press), estimate cable-yarding cost and production (SIMYAR; McGaughey and Twito 1987), visualize topography (VISUAL and SLOPE;McGaughey and Twito 1988), and develop DTMs from topographic maps (MAP; Twito and others 1987a).…”