2022 Fiscal Year Final Research Report
Accurate and continual water-level prediction in small rivers using inverse estimation method of rainfall-runoff processes
| Project/Area Number |
20H02249
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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 22040:Hydroengineering-related
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| Research Institution | Fukushima University |
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Principal Investigator |
YOKOO Yoshiyuki 福島大学, 共生システム理工学類, 教授 (90398503)
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| Co-Investigator(Kenkyū-buntansha) |
勝山 正則 京都府立大学, 生命環境科学研究科, 教授 (40425426)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 水位流量曲線 / モデリング / 地表面モデル / 河川流量 / 降水量 / 有効降雨 |
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| Outline of Final Research Achievements |
The present study aimed to develop a methodology for the continuous and accurate prediction of water levels in small river watersheds using the "inverse estimation and modeling method for rainfall-runoff processes" developed by the principal investigator. First, we developed several "land surface models" to estimate effective rainfall from observed rainfall. As a result, we found that the method based on the “Curve Number method” was the most appropriate among them. By using the rainfall-runoff model that consists of the "land surface model" and the rainfall-runoff model based on the "inverse estimation and modeling method of rainfall-runoff processes" together with a virtual water-level-discharge rating curve, we could develop a series of methods for estimating water levels in small river watersheds. However, we found that the accuracy of the estimated water level in several actual river watersheds were unsatisfactory, and it needs further improvements.
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| Free Research Field |
水文学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究は，観測網が脆弱な中小河川における水位の常時高精度予測につながる多くの知見を得た．当初，「降雨流出過程の逆推定・モデリング法」を使うことで簡単に水位の常時高精度予測が可能と考えていたものの，それには「地表面モデル」による有効降雨量の常時高精度予測が必要になることが新たに判明した．ここに本研究の学術的意義がある．今後，この「地表面モデル」を改良することで，水位予測精度は改善できると期待できる．水位予測精度が大きく改善すれば，日本全国の中小河川の常時高精度予測が可能になり，水害の軽減や河川の維持管理コストの削減が期待できる点に社会的意義がある．
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