Journal of The Japan Forest Engineering Society

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This study aimed to understand the current state of felling skill among forestry workers and to clarify the lack of acquired skills using simulated trees. Therefore, the simulation experiments were performed by making a notch cut and a felling cut according to safety guidelines. We measured the depth, direction, and slope of the notch cut as well as the width and uniformity of the hinge, and compared them with the guideline values. Consequently, it was shown that to improve the depth and direction of the notch cut at short forestry experience. Forestry workers made the notch's depth and the hingeʼs width according to the guidelines. The contact ratio with other trees was calculated using the direction and slope of the notch cut. The contact ratio was nearly 0% during line-thinning. In the line-thinning, the contact ratio was estimated to be approximately 20% using the direction of the notch cut. it was clarified that the lack of acquired skills was the direction of the notch cut.

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