| Project/Area Number |
21F21787
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 外国 |
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| Review Section |
Basic Section 31020:Earth resource engineering, Energy sciences-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
徳永 朋祥 (2021) 東京大学, 大学院新領域創成科学研究科, 教授 (70237072)
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| Co-Investigator(Kenkyū-buntansha) |
劉 佳奇 東京大学, 大学院新領域創成科学研究科, 助教 (00885577)
LIU JIAQI 東京大学, 新領域創成科学研究科, 外国人特別研究員
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| Project Period (FY) |
2021-09-28 – 2024-03-31
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| Project Status |
Granted (Fiscal Year 2022)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2022: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2021: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | Urban flood / Drywell / Numerical modeling / drywell / aquifer recharge / urban runoff |
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| Outline of Research at the Start |
本研究では、分散型水処理管理における帯水層圧入・揚水過程導入に対する技術的・経済的な課題を明らかにし、その解決に向けた情報を提供するためのモデルを構築することを目的としている。ここでは、水文学的モデルと経済学的モデルを統合したモデルを開発し、実サイトに適用することを試みる。帯水層圧入を実施する水の水質と圧入地点の空間分布を最適化することを通し、将来想定される様々な社会経済シナリオに対処することが可能な効率的な帯水層圧入・揚水の考え方を提示する。研究成果は、意思決定に資する情報を提供するものになることが期待される。
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| Outline of Annual Research Achievements |
During FY2022, we utilized an integrated surface-subsurface flow modeling approach to evaluate the effectiveness of drywells in reducing urban runoff at a catchment scale. A 3D model with HydroGeoSphere was developed, characterizing a synthetic unconfined aquifer covered by a layer of low-permeability materials. Sensitivity analyses of parameters such as land surface conditions, aquifer properties, drywell designs, and rainfall conditions were performed. Model results indicated that drywells are more effective in reducing runoff when the land surface has a higher Manning roughness coefficient or the aquifer material has a higher hydraulic conductivity. To achieve optimal performance, drywells should be situated beneath drainage routes that have high runoff flux. Increases in drywell radius or depth enhance the infiltration capacity, but deeper drywells can contaminate groundwater through infiltrating stormwater. Drywell performance declines with higher rainfall intensity, emphasizing the need for local rainfall intensity, duration, frequency (IDF) data to inform the design level of drywells in specific catchments
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The numerical modeling approach that has been proposed in the study has been rigorously tested through catchment scale applications. The results have been promising. The authors expect that the approach can be applied to realistic catchments, which would provide more practical insights.
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| Strategy for Future Research Activity |
The proposed modeling approach is scheduled to be applied to a real-world site, specifically Koganei City, Japan. The model will play a crucial role in analyzing the impact of installed drywells on groundwater storage and their efficacy in controlling urban flooding. The results of this analysis will be presented at the International Association of Hydrogeologists (IAH) meeting and submitted to a reputable journal to be shared with the wider scientific community. The outcomes of this research are expected to provide valuable insights into improving urban water management and flood prevention strategies.
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