Model to estimate the height of the gravity position in standing trees.

Taki Seishiro, Nakazawa Masahiko, Uemura Takumi, Akamatsu Haruto

doi:10.18945/jjfes.34.217

<p>In safe and accurate felling work, it is required to determine the height of gravity position in the standing tree. In addition, even in special cutting which sawing is performed in a state with tree lifted, it is necessary to set the hanging position at higher than the height of gravity position to ensure safety, so it is important to grasp the height of gravity position in the standing tree. However, almost no knowledge is found about specific model formulas for estimating the height of gravity position in the standing tree with branches. In this study, we tried to construct a model equation to estimate the height of gravity position in the standing tree using parameters that indicate the individual shape of the tree. The height of gravity position in which the lifted tree by using a rough terrain crane becomes horizontal was measured, the average height ratio of the height of gravity position to the tree height was 37.8%. We performed multiple regression analysis with the parameters that indicate the individual shape of the tree, and obtained a model equation to estimate the height of gravity position from the parameters of tree height and branch height. According to this result, the position about 6% of the branch height added to about 34% of the tree height was the height of gravity position. In the future, it is necessary to verify with a larger number of samples such as regionality and differences in three species.</p>

Model to estimate the height of the gravity position in standing trees.

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