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Elements and Performance Criteria
Performance Evidence
Knowledge Evidence
An individual must be able to demonstrate the knowledge required to perform the tasks outlined in the elements and performance criteria of this unit. This includes knowledge of:
tree dynamics and impact of tree form and morphologytree stability and physical loads affecting trees, particularly in high stress environmentsroot plate environment, including:depth and consistency of soilspatial limitationssite excavations and potential damagearboricultural activity and impact on tree structure and stability, including:pruning operations to branches and rootspresence and impact of defects on tree structure, including:extent of decay and damage of trunk and root systemassessment of strength and material properties of structural woodbiomechanical impact of wind on tree structure, including:seasonal wind patterns, and tree exposuresurface area and tree structureaerodynamic drag factor of tree crown in relation to trunk diameter and extent of hollownessestimation of primary loads occurring in seasonal climatic eventssevere wind-load due to storms and extreme weather conditionsload associated with rain and snow saturated foliageadditional drag associated with saturated foliageopen-grown form of treetesting principles for static load, including:use and purpose of a static load on trees during structural integrity testing as an estimate of a wind equivalent loadcalibrating static load testing instrumentslimits of structural safety during a static testingmeasurement of trunk strengthinvasive and non-invasive methods of testing treesassessment of root plate anchorage in the groundmethods and reasons for monitoring loads and forces on trees, including:electronic monitoringmonitoring of tree to ensure loads are kept within safe limitsvalue and purpose of benchmarks obtained from stable tree populationstree biomechanics studies using dynamic methods of analysis, including:simple models of tree dynamicscomplex models and finite element analysesmultimodal approaches representing dynamics of branches on treescalculations required for structural and biomechanical assessments of trees, including:mass of branchesvector of force on treestree dynamic responsewind velocity and directionstatistical analysis and interpretation of test resultsdynamic effect of branch movement on tree stability and failure rate, including:oscillation frequencyenergy dissipation and damping effect of canopy structurelikelihood of structural failurelevel of anchoring potential of root systemstability of treerecords and reporting procedures for analysis of structural integrity testing.