2015 Fiscal Year Annual Research Report
スイスおよび日本の排砂バイパストンネルの摩耗損傷の水理学的分析および対策提案
| Project/Area Number |
14F04776
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| Research Institution | Kyoto University |
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Principal Investigator |
角 哲也 京都大学, 防災研究所, 教授 (40311732)
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| Co-Investigator(Kenkyū-buntansha) |
AUEL CHRISTIAN 京都大学, 防災研究所, 外国人特別研究員
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| Project Period (FY) |
2014-04-25 – 2017-03-31
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| Keywords | Hydropower / Reservoir sedimentation / Sediment bypass tunnel / Turbulence / Particle motion / Invert abrasion / Abrasion model |
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| Outline of Annual Research Achievements |
My research focuses on sedimentation countermeasures in general and sediment bypass tunnels (SBT) as an effective and ecologically favorable measure in particular. SBTs route the incoming sediments into the dam tailwater during floods. Main drawbacks of SBTs are the high investment and maintenance costs. The high invert abrasion caused by fast sediment-laden flows is the most challenging problem affecting all tunnels. To estimate the invert abrasion, a prediction model was developed in my PhD thesis. The model was compared to a Japanese prediction model widely applied in engineering practice by comparing existing data on Asahi dam SBT in Japan and Pfaffensprung and Solis dams SBT in Swiss. Based on this study, an updated prediction model was proposed and published.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
I have progressed more than originally planned by publishing several scientific papers. Furthermore, Asahi, Miwa, and Koshibu SBT were visited as expected and data collection and close collaboration with dam owners developed nicely.
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| Strategy for Future Research Activity |
In the next fiscal year, I’d like to focus my research on tunnel abrasion management based on hydromechanics in a high speed flow velocity. Based on real abrasion pattern, how flow verocity profile will be disturbed and how much level will be accepted as an threshold value. For this study, hydraulic model test will be conducted and flow measurement will be implemented. Additionally, flow and sediment transport monitoring will be started at the Koshibu dam and I'll conduct data analysis on plate microphone sensor system. Finally, further tasks involve consulting of new SBT projects in Japan, support of new Bachelor and Master students and participation at International Congresses.
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