Application and Comparison of Three Tomographic Techniques for Detection of Decay in Trees

Nicolotti, G.; Socco, Laura; Martinis, R.; Godio, Alberto; Sambuelli, Luigi

doi:10.48044/jauf.2003.009

Cited by 48 publications

(29 citation statements)

References 22 publications

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“…The adoption of advanced technological methods of measuring decay or determining strength promises to improve the understanding the likelihood of failure due to decay. The effectiveness of technologically advanced decay-detecting devices is still unclear (Nicolotti et al 2003;Gilbert and Smiley 2004;Deflorio et al 2008;Wang and Allison 2008;Butnor et al 2009;Seifert et al 2010). Improving the accuracy of such devices, as well as the images they produce, would facilitate the numerical evaluation of decayed cross sections.…”

Section: Decay and Strength Lossmentioning

confidence: 99%

A Review of Factors That Affect the Static Load-Bearing Capacity of Urban Trees

Dahle¹,

James²,

Kane³

et al. 2017

AUF

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Over the last 30 years, researchers have begun to employ biomechanical principles to understand the stability of urban trees. This review concentrates on literature pertaining to trees in temperate urban landscapes, but also includes relevant work from other disciplines and climates as appropriate. The load-bearing capacity of a tree depends on its size and shape and the material properties of its wood. As the trunk and branches increase in diameter, their load-bearing capacity increases. Material properties (e.g., moduli of elasticity and rupture) describe intrinsic wood stiffness and strength, which influence deflection under load and load-bearing capacity, respectively. In wood, material properties vary in relation to a variety of factors, including the direction of loading, moisture content, and tree age. Wood decay reduces a tree’s load-bearing capacity. Although practitioners have developed guidelines to assess its effect, existing guidelines should be investigated, refined or rejected on the basis of rigorous scientific testing. Static load tests have been developed to address this question, as well as investigate the likelihood of uprooting, which accounts for up to 35% of tree failures. While much has been learned, many questions remain about the static load-bearing capacity of trees growing in urban landscapes.

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Section: Decay and Strength Lossmentioning

confidence: 99%

A Review of Factors That Affect the Static Load-Bearing Capacity of Urban Trees

Dahle¹,

James²,

Kane³

et al. 2017

AUF

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“…The presence of wider annual rings was noticed in some sections, corresponding either to more favorable climatic conditions in the development of the tree (Rinn 1988;Beldeanu 1999;Beldeanu 2008), or to the local conditions of tree growth. These wider annual rings suppose a different proportion of early and latewood (Filipovici 1964;Beldeanu 1999;Beldeanu 2008), which influences the wood density in the area (Nicolotti et al 2003;Lin et al 2008;Liang and Fu 2012;Feng et al 2014;Li et al 2014) and, finally, the speed of sound propagation (Sandoz and Lorin 1996;Wang et al 2007;Leboucher 2014). The comparative analysis of the tomograms with the visual appearance after cutting a slice with a chain-saw showed that some small defects located inside the stem were not evident in the tomogram (Figs.…”

Section: Comparison Of Tomograms With the Real State Of The Wood At T...mentioning

confidence: 99%

The agreement in accuracy between tomograms, resistograms, and the actual condition of the wood from lime trees harvested from cities

Musat

2023

BioRes

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The internal quality of the wood is one of the main factors affecting the stability of trees, and it has always been of great interest to science and practice. For this reason, the present study aims to compare the results obtained by wood tomograms with those of resistance to drilling and the visual appearance after cutting a slice with a chain-saw, both to evaluate the presence and dimensions of the inside defects, and also to evaluate the irregularities of the wood structure. Round pieces of lime wood harvested from public areas were used for comparison by taking sound tomograms, followed by taking resistograms on two perpendicular directions at the same level. The results showed that internal wood defects are not always the ones that lead to reduced speeds of sound propagation through the wood. In addition, there were instances in which changes in the internal structure of the wood led to improperly colored tomograms, namely the sections characterizing the point of insertion of a thick branch in the trunk, where the tomograms indicated low speeds of sound transfer through the wood in the stem and high speeds in the wood of the branch.

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“…Hasil asesmen kesehatan pohon secara visual dapat didukung dengan pengujian kondisi pelapukan batang utama menggunakan teknologi tomografi (Rachmadiyanto et al 2017). Penelitian menggunakan teknologi tomografi telah dilakukan oleh Nicolotti et al (2003), Karlinasari (2015), dan Göcke (2017) yang menunjukkan hasil bahwa penggunaan teknologi tomografi efektif untuk mendeteksi kelapukan batang utama pohon. Dengan demikian, penggabungan asesmen dari pengamatan visual dan pengujian dengan alat teknologi tomografi diharapkan mampu meningkatkan ketepatan hasil pengamatan kondisi kesehatan pohon.…”

Section: Pendahuluanunclassified

ASESMEN KESEHATAN POHON PUSAKA Eucalyptus alba Reinw. ex Blume DI KEBUN RAYA BOGOR SECARA VISUAL DAN TEKNOLOGI TOMOGRAFI

Rachmadiyanto

Setyanti²,

Rahmaningtiyas³

et al. 2022

BKR

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Eucalyptus alba Reinw. ex Blume merupakan pohon pusaka di Kebun Raya Bogor yang ditanam pada tahun 1892 (umur 130 tahun di tahun 2022), hanya ada satu spesimen, dan memiliki bentuk batang yang unik. Pohon dengan kategori pusaka ini perlu dilestarikan dengan memperhatikan kondisi kesehatannya. Tujuan penelitian ini adalah menganalisis kondisi kesehatan pohon secara visual dan teknologi tomografi serta rekomendasi penanganannya. Metode yang digunakan adalah pengamatan visual berdasarkan International Society of Arboriculture dan teknologi tomografi menggunakan PiCUS 3 Sonic Tomograph. Hasil penelitian menunjukkan bahwa secara visual E. alba memiliki potensi tumbang/patah yang rendah pada batang utama. Namun setelah dilakukan pengukuran pelapukan pada batang utama di berbagai level ketinggian dengan teknologi tomografi, hasilnya adalah di ketinggian 50 cm (95%), 140 cm (76%), 550 cm (18%), dan 810 cm (11%). Oleh karena itu, E. alba memiliki potensi tumbang yang besar pada batang bagian bawah karena persentase pelapukan yang melebihi 70% dengan diameter yang besar (275 cm). Rekomendasi penanganan pohon berisiko adalah mempertahankan proses fisiologis pohon dengan menjaga kesuburan tanah, pemasangan umpan rayap, pembuatan pagar melingkar ke arah utara, pengukuran pelapukan berkala (satu tahun sekali), dan pemberian papan informasi terkait kondisi terkini dan mitigasi bahayanya. Penebangan total atau sebagian tidak direkomendasikan mengingat status E. alba sebagai pohon pusaka.

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Application and Comparison of Three Tomographic Techniques for Detection of Decay in Trees

Cited by 48 publications

References 22 publications

A Review of Factors That Affect the Static Load-Bearing Capacity of Urban Trees

A Review of Factors That Affect the Static Load-Bearing Capacity of Urban Trees

The agreement in accuracy between tomograms, resistograms, and the actual condition of the wood from lime trees harvested from cities

ASESMEN KESEHATAN POHON PUSAKA Eucalyptus alba Reinw. ex Blume DI KEBUN RAYA BOGOR SECARA VISUAL DAN TEKNOLOGI TOMOGRAFI

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