2021 Fiscal Year Final Research Report
Estimation of potential large wood export in Japan
| Project/Area Number |
19H02395
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 25030:Disaster prevention engineering-related
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
川越 清樹 福島大学, 共生システム理工学類, 教授 (30548467)
峠 嘉哉 東北大学, 工学研究科, 助教 (90761536)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 流木流出 / 発生 / 堆積 / 斜面崩壊モデル / 貯留関数モデル |
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| Outline of Final Research Achievements |
A quantitative model for analyzing the mass balance of large wood and its export on an annual scale at a watershed scale was developed for the first time in the world. The model consists of two frameworks: the rainfall-induced analytical shallow landslide model for the large wood recruitment, and the double storage function with the lumped hydrological method at a watershed scale for the large wood entrainment. For the model application to the whole of Japan, field surveys at recent disaster areas with large wood export, model verification and improvements were carried out. Finally, a method for the risk assessment of large wood export on a watershed scale, considering its storage and , was established using the model.
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| Free Research Field |
水文学、土木工学
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| Academic Significance and Societal Importance of the Research Achievements |
世界初の流木流出の一連のプロセスに基づく流木流出統合モデルを開発した．これまで実現できなかった時系列的な流出流木量の流域評価を可能とする世界に先駆けた成果である．本モデルを用いた流木流出リスク評価手法を開発した．降水量のみから堆積流木量を考慮した流木流出リスクが推定できるため，実社会への実装に向けて極めて有効であると考える．
流出流木量の将来予測も視野に入れた，流出流木量に基づく河川流域の生物多様性評価や水災害リスク推定の手法を確立することは，地球温暖化時代のレジリエンス研究として非常に重要である．森林特性の将来予測手法の開発やEco-DRRへの展開はそれに資する当初の計画以上の研究成果である．
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