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Windthrow Mechanics

Resisting forces. Show Larger Image
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Resisting Forces
  • Bole strength and root/soil strength enable trees to resist breakage or overturning.
  • Strong, tapered stems resist bending and stay straight, which reduces the turning moment due to crown displacement.
  • The resistance of the root/soil system to uprooting and overturning depends on strong roots, a good rooting arrangement, a large root/soil mass, and a cohesive bond between roots and soil.
  • Bole strength is not usually affected as the tree sways back and forth during a wind storm. However, the root/soil bond can break down, especially if the soils are low strength or wet.
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