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Acoustic tomography for decay detection in red oak trees

Author: Xiping Wang, (Wood scientist); Forest Products Laboratory (U.S.)
Publisher: Madison, WI : USDA, Forest Service, Forest Products Laboratory, [2007]
Series: Research paper FPL-RP, 642.
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Summary:
The science of tree stability analysis uses both biological and engineering principles in attempting to rate a tree's structural soundness and make reasonable predictions of potential for failure. In such analysis, arborists are often challenged by internal structural defects hidden from view within the trunks. This paper reports the results of an investigation using acoustic tomography to detect internal decay in  Read more...
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Additional Physical Format: Acoustic tomography for decay detection in red oak trees
7 p.
(OCoLC)224462200
Online version:
Acoustic tomography for decay detection in red oak trees.
Madison, WI : USDA, Forest Service, Forest Products Laboratory, [2007]
(OCoLC)624416409
Material Type: Government publication, National government publication, Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: Xiping Wang, (Wood scientist); Forest Products Laboratory (U.S.)
OCLC Number: 180719105
Notes: Cover title.
"August 2007"--Title page verso.
Description: 7 pages : illustrations (some color) ; 28 cm.
Series Title: Research paper FPL-RP, 642.
Responsibility: Xiping Wang ... [et a.].

Abstract:

The science of tree stability analysis uses both biological and engineering principles in attempting to rate a tree's structural soundness and make reasonable predictions of potential for failure. In such analysis, arborists are often challenged by internal structural defects hidden from view within the trunks. This paper reports the results of an investigation using acoustic tomography to detect internal decay in park trees. Two century-old red oak (Quercus rubra) trees located at the Capitol Park in Madison, Wisconsin, were nondestructively evaluated using an acoustic tomography technique. The trees were subsequently felled, and a disk at each test location was obtained and examined. We found that the light-colored zones in the tomograms were larger than the true decay present in the disks. The oversized light-colored areas were the composite effects of both decay and large internal cracks. The results of this study demonstrated that acoustic tomography cannot distinguish between large internal cracks and heartwood decay. To make a better assessment of internal condition for urban trees, resistance microdrilling should also be used prior to tree removal.

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