한국환경생태학회지 (Korean Journal of Environment and Ecology)

  • 제36권5호
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  • Pages.535-549
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  • 2022
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  • 1229-3857(pISSN)
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  • 2288-131X(eISSN)
한국환경생태학회 (Korean Society of Environment and Ecology)
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노거수 내부결함 탐지를 위한 비파괴 음파단층촬영의 신뢰성 분석(소나무·은행나무를 중심으로)

Reliability of Non-invasive Sonic Tomography for the Detection of Internal Defects in Old, Large Trees of Pinus densiflora Siebold & Zucc. and Ginkgo biloba L.

  • 손지원 (국립문화재연구원 자연문화재연구실) ;
  • 이광규 (국립문화재연구원 자연문화재연구실) ;
  • 안유진 (국립문화재연구원 자연문화재연구실) ;
  • 신진호 (국립문화재연구원 자연문화재연구실)
  • Son, Ji-Won (Div. of Natural Heritage, National Research Institute of Cultural Heritage) ;
  • Lee, Gwang-Gyu (Div. of Natural Heritage, National Research Institute of Cultural Heritage) ;
  • An, Yoo-Jin (Div. of Natural Heritage, National Research Institute of Cultural Heritage) ;
  • Shin, Jin-Ho (Div. of Natural Heritage, National Research Institute of Cultural Heritage)
  • 투고 : 2022.06.17
  • 심사 : 2022.09.08
  • 발행 : 2022.10.31
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초록

강풍, 폭우 등 이상기후의 대형화와 빈도 증가로 인해 나무가 부러지거나 쓰러지는 훼손이 증가하고 있으나 나무 내부의 공동, 부후 등 구조적 결함은 육안조사로 판별이 어렵기 때문에 예측을 통한 사전대응에 한계가 있다. 비파괴음파단층촬영은 나무에 미치는 물리적 훼손을 최소화하면서 내부결함을 추정하는 방법으로 내부결함 진단에 효율적이나 수종별 정확도에 차이가 발생하기 때문에 현장적용 전 측정결과의 신뢰성 분석이 선행되어야 한다. 이번 연구는 우리나라 대표 수종인 소나무와 은행나무 노거수를 대상으로 음파단층촬영의 신뢰성 검증을 위해 침입성 드릴저항 측정을 교차 적용하여 목재 내부결함을 측정하고 평가결과를 비교하였다. 두 집단 간 결함부 측정 평균값에 대한 t검정 결과 소나무는 통계적으로 유의한 차이가 없는 반면, 은행나무는 유의성에 차이가 있었다. 선형회귀분석 결과 두 수종 모두 드릴저항그래프의 결함이 증가할 때 음파단층영상 결함이 증가하는 양의 상관관계를 보였다.

Damage to forests, such as broken or falling trees, has increased due to the increased intensity and frequency of abnormal climate events, such as strong winds and heavy rains. However, it is difficult to respond to them in advance based on prediction since structural defects such as cavities and bumps inside trees are difficult to identify with a visual inspection. Non-invasive sonic tomography (SoT) is a method of estimating internal defects while minimizing physical damage to trees. Although SoT is effective in diagnosing internal defects, its accuracy varies depending on the species. Therefore, it is necessary to analyze the reliability of its measurement results before applying it in the field. In this study, we measured internal defects in wood by cross-applying destructive resistance micro drilling on old Pinus densifloraSiebold & Zucc. and Ginkgo bilobaL., which are representative tree species in Korea, to verify the reliability of SoT and compared the evaluation results. The t-test for the mean values of the defect measurement between the two groups showed no statistically significant difference in pine trees and some difference in ginkgo trees. Linear regression analysis results showed a positive correlation with an increase in defects in SoT images when the defects in the drill resistance graph increased in both species.

키워드

과제정보

이 논문은 국립문화재연구원에서 지원하는 연구비(NRICH-2105-A13F-1)에 의하여 연구되었음.

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