ForOp is a model of forest operations under development, which originates from the ForEnerChips model.

Woody material flows are described from felling of trees simulated by a growth model up to product delivery at the gate of the processing industry, based on user-defined scenarios. The model is designed to account for different types of forest stands and silvicultural schedules, ways of tree description and assignment of products (roundwood of different qualities, chips), and types of tasks (e.g. felling, bucking and delimbing, extraction, transport) and related machines.

It also accounts for transport of humans and machines to the forest, and for machine building, maintenance and recycling.

Potential model outputs include material flows (product assignment, harvesting residues, losses) and related wood properties (e.g. nutrient content), energy consumptions and greenhouse gas emissions of machines, and worktimes of humans and machines.

Model development additionally aims at describing forest operations that do not generate woody material flows (e.g. planting, tending).