ESTIMATION OF TREE DENSITY IN RIVER CHANNEL USING ALB DATA AND INDIVIDUAL TREE ANALYSIS METHOD AND ITS APPLICATION TO HYDRAULIC ANALYSIS

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  • ZHOU Yuexia
    名古屋大学 工学研究科土木工学専攻
  • TODA Yuji
    名古屋大学 工学研究科土木工学専攻
  • MIZOGUCHI Yuta
    土木研究所 流域水環境研究グループ 流域生態チーム

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  • ALB測量データと単木解析手法による河道内樹木密生度の推定及び水理解析への活用

Abstract

<p> In order to estimate the effects of trees in a river channel on flow capacity and phenomena such as scouring and fixation of low channels using a hydraulic analysis model, it is necessary to determine the density and height of trees in the river channel. Although it takes an enormous amount of labor and cost to survey tree height and density in the entire river channel, it is expected to develop a technology that can efficiently obtain information on trees in the entire river channel by utilizing aerial laser survey (ALB) data, which is widely used in river surveys. In this study, the density of trees (bamboo forests and woody plants) was estimated using ALB point cloud data and an individual-tree analysis method, and the results were used in a hydraulic analysis to evaluate the effect on the simulation result of water levels. Comparison with the field survey results showed that the individual-tree analysis method can extract the height of trees and the range of woody. It was found that the accuracy of the water level simulation result was relatively high when the extracted tree density was used in the simulation model.</p>

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