Tree assessment and Picus Sonic Tomography Test

Tree Assessments are conducted by a Level 5 AQF, level 5 Arborist. These are referred to a Basic Assessment, a visual survey conducted from the ground using a steel probe and a rubber mallet (formerly VTA- Visible Tree Assessment). Angophora Consulting Arborist uses the International Society of Arboricutural (ISA) Tree Risk Assessment Qualifications (TRAQ). During the Basic Assessment it may be recommended for a more advanced assessment to take place such as an tissue testing, an Aerial Inspection of the canopy or soil. A Picus Sonic Tomography Test can be used to determine the structural integrity of a tree trunk or where a defect is observed higher in the tree. This would combine an aerial Inspection and a Picus Sonic Tomography test using an Elevated Work Platform EWP (Cherry Picker). The Picus Sonic Tomograph is an instrument used for the detection of decay and cavities in standing trees. It uses the fact that velocity of sound in wood depends on modules of elasticity and density. Most damages, impair the safety against the fracture of trees, in particular cavities. White and brown rots reduce elasticity and density in wood. The test produces a colour coded two dimensional image of the test site. Angophora Consulting Arborist has been using the Picus Sonic Tomography to test trees for Councils and Private residences since 2007. We’ve recently updated the software and hardware to digital and increased the number of sensors from 6 to 12. Allowing us improved precision in a reading and also enables us to test larger trees. I have attached some sample test results. The first is of a Eucalyptus Deanei (Blue Mountains Blue Gum) where the centre has been decayed but the tree is still structurally sound and healthy. The second shows a Eucalyptus Mannifera (Brittle Gum) that is no longer safe to retain due to the internal damage. The 3rd and 4th Picus Sonic Tomography test shows a Corymbia citriodora (Lemon scented gum) that could be retained with remedial actions, such as pruning for a short term. Also included on this test is a red ring to shows where the 70/30 rule applies. A tree should have at least 30% healthy timber and less than 70% damaged or compromised timber. This is a general guide only with other considerations also taken into account, such as species, location of damage i.e. on lean side of tree and finally, where the tree is located. By using such advanced technology Angophora Consulting Arborist can help you and your stakeholders decide on whether you should retain a tree. Of particular importance are large trees that could be of community or historical significance to a site, whether European or Aboriginal. Other areas of consideration include public and shared spaces, such as trees located at a school, shopping centre, car park, University, Hospital, Church or maybe when you just need an Independent assessment of the tree. Angophora Consulting Arborist can provide this service as an independent Arborist with no links to Practicing Arborists (tree lopper) guaranteeing accurate advice with environmental sustainability in mind. For any or more information please contact me by phone 0418 966 488, e-mail info@angophoraarborsit.com.au or leave a message on Facebook and I will contact you (If you do contact by Facebook please leave a Phone number and best time to call).