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Quantitative Evaluation of Coastal Forests on Natural Disaster Mitigation - Considering the Complexity of Vegetation Structures

Research Project

Project/Area Number 20K14838
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 22040:Hydroengineering-related
Research InstitutionKyoto University

Principal Investigator

Chang Che-Wei  京都大学, 防災研究所, 特定助教 (20866826)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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 / 水理模型実験 / 水槽実験 / ブシネスクモデル / 津波 / 高潮 / 高波
Outline of Research at the Start

近年、気候変動による沿岸域のリスクが増加しつつあると考えられる一方、海岸林等の生態系を生かしたEco-DRRは低コストかつ効果的な高波に対する防御として注目を集めている。しかし、沿岸林のEco-DRR機能についての評価は簡略化されたモデルにもとづき行われており、実務レベルで要求される定量的評価には至らない。本課題では、アジア・太平洋域で主要な海岸林であるマングローブと松を対象に最新の3D技術を用いて複雑な海岸林の物理形状を正確に模擬した水槽実験を行い、波浪減衰評価を実施する。実験結果をもとに海岸林についての数理モデル構築し、これを数値モデルに組み込み、沿岸林の防御機能を定量化する。

Outline of Final Research Achievements

The study discovered correlations between morphological parameters of mangroves in field surveys, based on which a new parameterization was proposed. Using 3D-printed scale models that replicated the exact root structure of mangroves, we studied wave-mangrove interactions and established the empirical formulas for force coefficients that represent mangrove resistance. By inspecting fluid velocity and turbulence surrounding mangroves, we identified the blockage effects and the enhanced turbulent kinetic energy induced by mangrove roots, which highlighted the importance of mangrove roots to hydrodynamics. With the empirical formulas of force coefficients from laboratory experiments, we parameterized mangrove-induced resistance in a Boussinesq-type model to simulate water waves through mangroves. The model results showed that accounting for both drag ad inertia effects improves the model simulation of experimental measurements without relying on calibration.

Academic Significance and Societal Importance of the Research Achievements

現地調査での測定は豊富なデータベースを構成し、他の研究者が数値シミュレーションでマングローブをパラメータ化するのに利用できる。実験室実験により、波とマングローブの相互作用や波浪減衰に対するマングローブの効果について、根の構造を含めた詳細な情報が明らかになったことは、環境保全や沿岸保護にとって非常に重要な発見となる。開発したマングローブ効果を組み込んだ数値モデルは、将来のリスク評価に利用することができる。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (8 results)

All 2022 2021 2020

All Journal Article (5 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 5 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] An Experimental Study of Mangrove‐Induced Resistance on Water Waves Considering the Impacts of Typical <i>Rhizophora</i> Roots2022

    • Author(s)
      Chang Che‐Wei、Mori Nobuhito、Tsuruta Naoki、Suzuki Kojiro、Yanagisawa Hideaki
    • Journal Title

      Journal of Geophysical Research: Oceans

      Volume: 127 Issue: 6

    • DOI

      10.1029/2022jc018653

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Parameterization of Mangrove Root Structure of Rhizophora stylosa in Coastal Hydrodynamic Model2022

    • Author(s)
      Mori Nobuhito、Chang Che-Wei、Inoue Tomomi、Akaji Yasuaki、Hinokidani Ko、Baba Shigeyuki、Takagi Masashi、Mori Sotaro、Koike Hironoshin、Miyauchi Miho、Suganuma Ryosuke、Sabunas Audrius、Miyashita Takuya、Shimura Tomoya
    • Journal Title

      Frontiers in Built Environment

      Volume: 7 Pages: 782219-782219

    • DOI

      10.3389/fbuil.2021.782219

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effect of flexible coastal vegetation on waves in water of intermediate depth2021

    • Author(s)
      Hu Jie、Mei Chiang C.、Chang Che-Wei、Liu Philip L-F.
    • Journal Title

      Coastal Engineering

      Volume: 168 Pages: 103937-103937

    • DOI

      10.1016/j.coastaleng.2021.103937

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Green infrastructure for the reduction of coastal disasters: a review of the protective role of coastal forests against tsunami, storm surge, and wind waves2021

    • Author(s)
      Chang Che-Wei、Mori Nobuhito
    • Journal Title

      Coastal Engineering Journal

      Volume: 63 Issue: 3 Pages: 370-385

    • DOI

      10.1080/21664250.2021.1929742

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Application of Boussinesq Modeling on Water Waves through Mangroves2020

    • Author(s)
      CHANG Che-Wei、MORI Nobuhito
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

      Volume: 76 Issue: 2 Pages: I_49-I_54

    • DOI

      10.2208/kaigan.76.2_I_49

    • NAID

      130007935875

    • ISSN
      1883-8944, 1884-2399
    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Mangrove and its impacts on water waves: a model-scale laboratory study using 3D replicas of typical Rhizophora2022

    • Author(s)
      Chang, Che-Wei
    • Organizer
      37th International Conference on Coastal Engineering (ICCE 2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Recent investigation on the protective function of mangroves against coastal waves2021

    • Author(s)
      Chang, Che-Wei
    • Organizer
      43rd Ocean Engineering Conference in Taiwan
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Application of Boussinesq Modeling on Water Waves through Mangroves2020

    • Author(s)
      Che-Wei CHANG and Nobuhito MORI
    • Organizer
      土木学会 海岸工学講演会
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

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Published: 2020-04-28   Modified: 2024-01-30  

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