Assessment of the expected wind load

The wind load that a tree is exposed to has a decisive influence on tree-statistics calculations. For calculation of the stability and safety against fracture of a tree, initial evaluation of the maximum wind loads (i.e. assuming hurricane-like wind conditions) that are applied to the tree is required.

TSE integrates the following tree-specific and topographic factors for calculation of the expected wind loads:

Top sail surface and its load centre (for this, use of an appropriate computer programme, e.g. ArWiLo, is required)
Aerodynamic behaviour of the tree top (Cw value)
Frequency factor (considers the oscillation willingness of the tree)
Terrain factor (includes wind-decelerating topographic conditions, e.g. roughness of the ground)
Squall factor (represents the influence of wind-enhancing effects and turbulences, e.g. street canyons)
Air pressure

In compliance with the rules of DIN 1055, TSE connects the various influence factors of wind loads on trees and as a result provides a theoretical maximum wind load acting at the load centre. This load is then included as comparative value in further calculations for stability and safety against fracture.

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