The dynamic pulling test
Requires wind gusts at least 25 km/h
Uses real wind instead of cable
As the tree is measured in real windy situation, the effect of the surroundings, the actual crown and soil conditions are included
Let the wind work for you :)
An instrument for measuring wind velocity at or near the tree to be evaluated. The closer to the better, but, depending on wind velocity DynaRoot may provide reliable data even with measurements taken several kilometres/miles away. The anemometer provides wind velocity data of sufficient frequency, Ideally the anemometer should be clear of buildings or other objects that may obstruct the wind, at a height of at least 10m.
An instrument affixed to the root collar that measures the inclination of the trunk in two perpendicular directions. The instrument provides very accurate inclination data with sufficient frequency.
An instrument attached to the trunk for measuring the micro elongation of the trunk.
A PC software for evaluating wind velocity and inclination. The data, recorded over a period of several hours, are transferred from the anemometer and inclinometer on memory cards or wirelessly via Wi-Fi. The software breaks the data down into shorter intervals, and calculates statistical parameters for each interval that are used for the tree stability evaluation.
DynaRoot/DynaTree requires an online account. If you do not have one, please ask us to create one for you (at firstname.lastname@example.org). This is free, even if you haven't bought the device yet.