Analysis of mechanical stability of a large mature tree using 3D shape data

2014 Fiscal Year Final Research Report

• Project/Area Number: 25660285
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Environmental agriculture(including landscape science)
• Research Institution: Osaka Prefecture University
• Principal Investigator: NAKAMURA Akihiro 大阪府立大学, 生命環境科学研究科(系), 准教授 (20264814)
• Co-Investigator(Kenkyū-buntansha): KIMATA Takashi 大阪府立大学, 大学院生命環境科学研究科, 講師 (60254439)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 巨樹 / クスノキ / 3次元計測 / 樹冠形状 / 重量分布 / 力学的強度

Outline of Final Research Achievements

A volumetric model of the trunk, branches, and leaves of a large, mature Cinnamomum tree was built from 3D point cloud data obtained via a terrestrial LIDAR survey of the tree. The model was then used to calculate the weight distribution of the tree and the forces exerted on a supporting pole due to the weight of the branch it supported and the force applied to that branch under high wind conditions. Both the branch and the pole were assumed to be static for the calculations. Leaf area was also estimated using transmittance ratios of direct solar radiation under the Cinnamomum canopy. The transmittance data was obtained from a direct pyranometer in an open site and global pyranometers placed under the canopy. However the estimation of leaf area was unsuccessful. Data on leaf inclination angles, and sensor area and data allowing the discrimination of leaves and twigs were thought to be necessary.

Free Research Field

緑化工学