2023 Fiscal Year Final Research Report
Evaluation of Water Cycle Components Using Dynamic Isoscape Models and Its Multifaceted Development
| Project/Area Number |
19H01370
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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 04010:Geography-related
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| Research Institution | University of Tsukuba |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | 水循環 / 同位体 / トレーサー / モデル |
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| Outline of Final Research Achievements |
We developed a dynamic precipitation isoscape model using global objective analysis data as input and constructed various isotope models that can be integrated with it. Furthermore, we applied thes models to component separation in watershed evapotranspiration, snowmelt runoff, lake water balance, and hot springs. As a result, we found that: (1) proper consideration of selection effects is necessary to accurately estimate the transpiration/evapotranspiration ratio; (2) river water isotope information is effective for advancing the snowmelt runoff model and accurately estimating snowmelt components; (3) the spatiotemporal heterogeneity of recharge water isotope ratios must be appropriately considered to accurately estimate the evaporation/inflow ratio of lakes; and (4) the use of a meteoric water isoscape model and a lithospheric water curve allows for the precise evaluation of the mixing ratio of lithospheric water components.
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| Free Research Field |
水文科学
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| Academic Significance and Societal Importance of the Research Achievements |
地球上あるいは地球内部の水循環は様々な要素で構成されているが、物理的手段によって直接計測できるものは限られている。そのため、水の安定同位体情報によってそれらを推定するアプローチは大変有望であると言える。本研究によって開発されたモデル群及びそれらから出力されるデータ群は、そうした研究の情報・技術インフラとして貴重である。また、それらの応用上の留意点や改善策を提示した点には学術的価値がある。さらに、これらの適切な利用は水資源や生態系サービスを適切に保全するうえで役立つと考えられ、その社会的意義も大きい。
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