Evaluation of drag force of trees damaged from storm and flood

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Evaluation of drag force of trees damaged by storm and flood, the mechanism of collapse and the break were examined from the experiment and the field survey. The following were examined from the model experiment. The drag that combined the branch and the leaves would allot 90% at the strong wind, and it was clarified that the drag evaluation of the canopy was important though the leaves in the low wind was an effect of 60% allotment. The following were examined from the field survey. The age of a tree was about 20 years in the collapsing tree, and the breaking showed no relation to the age of a tree. The collapse moment of the struck tree was clarified from the pulling down examination of the tree. The relation between the age of a tree and the tree form structure was requested. In addition, the bending test was executed, the flexural capacity of unseasoned wood was examined, the region of the collapse and the break was shown from the model analysis, and the mechanism was clarified.