2021 Fiscal Year Final Research Report
Recharge process of water resources associated with snowmelt in alpine areas focusing on the residence time of water
| Project/Area Number |
19K13433
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 04010:Geography-related
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| Research Institution | Shinshu University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 高山帯 / 雪氷融解 / 水涵養 / 水流出 / トレーサー / 土地被覆 |
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| Outline of Final Research Achievements |
Hydrological observations, water sampling, and chemical/isotopic analyses were conducted in the alpine area above the forest limit to clarify the mechanism of water recharge and discharge associated with snowmelt in headwaters of the alpine zone. The results suggest that the dominant factors controlling water runoff and recharge in the alpine zone are short-term accumulated precipitation and the supply of snowmelt water. The application of a tracer-based component separation method revealed that the components of runoff water change from snow/ice and precipitation to groundwater and soil water as the snow/ice retreats during the summer season. Furthermore, the distinctly different water quality and isotopic ratios of runoff between vegetated and bare areas indicated that land cover conditions may determine the water storage function in alpine zones.
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| Free Research Field |
水文学，山岳科学
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| Academic Significance and Societal Importance of the Research Achievements |
気候変動の影響を受けやすい高山帯は極めて多い降水量を有し，下流域に豊富な水資源を供給する．本研究は，これまで，実測による研究例が少なかった高山帯水文学研究に現地観測を主手法として取り組んだ．水涵養・流出過程の定性的・定量的解析を実施することで，雪氷融解・短期積算降水量・土地被覆が高山帯水循環を主に制御することを示唆した．本研究成果は，水資源賦存量の将来予測技術の向上や近年頻発する土砂災害・洪水の予測・警報システム開発という防災の面に貢献でき，学術的のみならず社会的に意義があると考えられる．
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