2022 Fiscal Year Annual Research Report
Quantitative Evaluation of Coastal Forests on Natural Disaster Mitigation - Considering the Complexity of Vegetation Structures
| Project/Area Number |
20K14838
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| Research Institution | Kyoto University |
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Principal Investigator |
張 哲維 京都大学, 防災研究所, 特定助教 (20866826)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 海岸林 / 波浪減衰 / 沿岸災害 / 気候変動適応策 / マングローブ / Eco-DRR / 水槽実験 |
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| Outline of Annual Research Achievements |
Coastal forests can serve as an ecosystem-based solution to protect the shorelines against coastal hazards.
However, practical guidelines in the design and evaluation of their performance have been lacking. Accordingly, this study aims to investigate two typical coastal forests in Asia-Pacific areas, mangroves and pine trees, and their effectiveness in reducing wave energy. The research approaches include field surveys, laboratory experiments, and numerical simulations.
Collaborating with ecologists from the National Institute for Environmental Studies, the International Society for Mangrove Ecosystems of Japan, and the Forestry and Forest Products Research Institute, I conducted field surveys in Iriomote island in Japan to collect field data on mangroves, including their geometric parameters, mechanical properties, and LiDAR-scanned images. In addition, I conducted laboratory experiments using 3D mangrove models, measuring vegetation resistance on water waves.
Given the empirical relationships between force coefficients and flow parameters, vegetation-induced resistance is incorporated into the developed numerical model. The performance of the numerical model was tested by comparing numerical results with the experimental data. By inspecting fluid velocity and turbulence surrounding mangroves, the blockage effects and the enhanced turbulent kinetic energy induced by mangrove roots were clearly identified. The latest results were presented in international conferences.
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