Stability of solid particle tracer suspended in groundwater as a marker for determining three dimensional flow using ultrasonic reflection echo
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- Saito Hironori
- Course of Applied Science, Graduate School of Engineering, Tokai University (currently Mitsubish Materials Co. Ld)
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- Ohe Toshiaki
- School of Engineering, Tokai University
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- Shinyashiki Naoki
- School of Science, Tokai University
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- Yagihara Shin
- School of Science, Tokai University
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- Umino Yuya
- Course of Physics, Graduate School of Science, Tokai University
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- Toida Masaru
- Kajima Corporation, Kajima Technical Research Institute
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- Tanaka Mayumi
- Kajima Corporation, Kajima Technical Research Institute
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- Sato Mitsuyoshi
- Toshiba
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- Suzuki Takehiko
- Toshiba
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- Nagai Satoshi
- Toshiba
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- Nishigaki Makoto
- Faculty of Environmental Science and Technology, Okayama University
Bibliographic Information
- Other Title
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- 超音波反射エコーを用いた地下水3次元流向・流速測定のための安定浮遊固体トレーサの開発
Abstract
The flow rate of underground-water in deep geologic environment is a key parameter to evaluate the performance of the repository for high-level radioactive waste disposal. The preliminary estimation however suggested the flow rate is much lower than the detection limit using conventional measurement techniques. This situation may underestimate the repository function because of the lack of the actual measured data. Thus the authors developed a new technique for the three-dimensional flow measurement by using the ultrasonic echo reflected from solid particle tracers suspended in groundwater. The moving track is traced by the matrix arrayed sensor and this technique enables us to measure the wide range of flow rates of 10-10~10-5m/s. The preliminary experiments hence suggested the tracer must be stably suspended for a period not shorter than two days. To realize this requirement, the disturbance of sedimentation due to density difference between the solid particle and groundwater and Brownian motion of the particle must be estimated and eliminated. We designed and fabricated the solid particle tracer having a core covered with a shell of different density and the resulting density is easily adjustable. The stability of the tracer was examined by in-situ experiment carried out in 500m depth bore hole and successfully measured the flow rates of 10-10~10-5m/s.
Journal
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- Journal of Nuclear Fuel Cycle and Environment
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Journal of Nuclear Fuel Cycle and Environment 13 (1), 23-30, 2006
Division of Nuclear Fuel Cycle and Environment, Atomic Energy Society of Japan
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Details 詳細情報について
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- CRID
- 1390282680313394560
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- NII Article ID
- 130003378425
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- ISSN
- 21867135
- 18847579
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed