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Onoe, Hironori; Yamamoto, Shinya*; Kohashi, Akio; Ozaki, Yusuke; Sakurai, Hideyuki*; Masumoto, Kiyoshi*
JAEA-Research 2018-003, 84 Pages, 2018/06
JAEA-Research-2018-003.pdf:17.44MB
In this study, numerical experiments considered hydrogeological structures, which has high heterogeneity around the Mizunami Underground Research Laboratory and inverse analysis using in-situ data were carried out. The results showed that concentration of hydrogeological structure to be estimated and location of monitoring point is important for application of inverse analysis. Furthermore, it is concluded that inverse analysis using hydraulic response due to pumping test is effective for hydrogeological characterization.
Kohashi, Akio; Onoe, Hironori; Yamamoto, Shinya*; Honda, Makoto*; Sakurai, Hideyuki*; Masumoto, Kiyoshi*
JAEA-Research 2015-022, 89 Pages, 2016/03
JAEA-Research-2015-022.pdf:27.85MB
In Japan, high-level radioactive waste (HLW) will be emplaced in a stable host rock formation deeper than 300 meters underground for geological disposal. It is important to understand heterogeneous distribution of hydraulic conductivity from the viewpoints of the safety assessment of geological disposal of HLW and construction of underground facilities. Inverse analysis based on the transient data is an efficient technique for estimating the heterogeneous distribution. In this study, numerical experiments with the adjoint state method and the ensemble Kalman filter were carried out in order to understand effective method for application of these inverse analysis. As a result of this study, the capability of each analysis techniques was shown.
Yamamoto, Shinya*; Honda, Makoto*; Sakurai, Hideyuki*; Suzuki, Makoto*; Sanada, Hiroyuki; Sugita, Yutaka; Matsui, Hiroya
Proceedings of 14th Annual Conference of the International Association for Mathematical Geosciences (IAMG 2010) (CD-ROM), 12 Pages, 2010/09
The distribution of groundwater properties is important for understanding of the deep underground hydrogeological environments in the design of the HLW disposal facilities. This study proposes a geostatistical system for modeling the chemical properties of groundwater which have a correlation with the resistivity data obtained from widespread and exhaustive survey. The proposed system is consists of two methodologies (resistivity data integration using Simple Kriging with varying local mean (SKlm) and 3D distribution modeling of hydro-chemical properties of groundwater estimated by SKlm algorithm). 2 types of uncertainty are considered: (1) Aleatory uncertainty; (2) Epistemic uncertainty. As a result, the uncertainties of the proposal model have been estimated lower than other traditional model's.
Honda, Makoto*; Yamamoto, Shinya*; Sakurai, Hideyuki*; Suzuki, Makoto*; Sanada, Hiroyuki; Sugita, Yutaka; Matsui, Hiroya
Doboku Gakkai Rombunshu, C, 66(3), p.609 - 624, 2010/08
This paper proposes a geostatistical system for modeling the groundwater properties which have a correlation with the ground resistivity data obtained from widespread and exhaustive electromagnetic survey. That is, the methodology for the integration of resistivity data measured by various methods and the methodology for modeling the groundwater properties using the integrated resistivity data has been developed. The proposed system has also been validated using the data obtained in the surface-based investigations of the Horonobe URL project. Additionally, the quantification of uncertainties in the estimated model has been tried by numerical simulations based on the data. As a result, the uncertainties of the proposal model have been estimated lower than other traditional model's.
Yamamoto, Shinya*; Sakurai, Hideyuki*; Suzuki, Makoto*; Hokari, Toshiyuki*; Shiraishi, Tomonari*; Matsui, Hiroya; Sugita, Yutaka; Sanada, Hiroyuki
no journal, ,
no abstracts in English
Sakurai, Hideyuki*; Honda, Makoto*; Yamamoto, Shinya*; Suzuki, Makoto*; Sanada, Hiroyuki; Sugita, Yutaka; Matsui, Hiroya
no journal, ,
This paper proposes a geostatistical system for modeling the groundwater properties which have a correlation with the ground resistivity data obtained from widespread and exhaustive electromagnetic survey. That is, the methodology for the integration of resistivity data measured by various methods and the methodology for modeling the groundwater properties using the integrated resistivity data has been developed. The proposed system has also been validated using the data obtained in the surface-based investigations of the Horonobe URL project. Additionally, the quantification of uncertainties in the estimated model has been tried by numerical simulations based on the data. As a result, the uncertainties of the proposal model have been estimated lower than other traditional model's.
Honda, Makoto*; Sakurai, Hideyuki*; Yamamoto, Shinya*; Suzuki, Makoto*; Sanada, Hiroyuki; Sugita, Yutaka; Matsui, Hiroya
no journal, ,
This paper proposes a geostatistical system for modeling the groundwater properties which have a correlation with the ground resistivity data obtained from widespread and exhaustive electromagnetic survey. That is, the methodology for the integration of resistivity data measured by various methods and the methodology for modeling the groundwater properties using the integrated resistivity data has been developed. The proposed system has also been validated using the data obtained in the surface-based investigations of the Horonobe URL project. Additionally, the quantification of uncertainties in the estimated model has been tried by numerical simulations based on the data. As a result, the uncertainties of the proposal model have been estimated lower than other traditional model's.
Oka, Kiyoshi; Seki, Takeshi; Akatsu, Tomohiro; Akutsu, Hiroyoshi*; Yamamoto, Tetsuya*; Ihara, Satoshi*; Watanabe, Shinya*; Matsumura, Akira*; Kikuta, Kenichiro*
no journal, ,
For the neuroendoscopic surgery, we are developing a new laser-irradiating fiberscope system. In this system, we use a composite-type optical fiberscope (COF) with 1 mm in outer diameter, which can transmit both laser energy and images for observation simultaneously. The diameter of the cautery laser fiber is 0.1 mm, which is located in the center of the imaging fibers. In this animal experimental study, we conducted the laser-irradiation on the femoral artery and vein of a rat using a usual single core fiber of 0.1 mm in outer diameter and the COF in order to assess the availability of this system. As a result, the blood flow decreased to 1/2 or 1/3 after a cauterization with the single core fiber. Furthermore, in the laser irradiation with the COF, the contraction of the artery with minimal heat damage of adjacent tissue was confirmed. Under direct observation with optical fiberscope, the obliteration of arteries was safely and successfully performed.
Watanabe, Shinya*; Akutsu, Hiroyoshi*; Yamamoto, Tetsuya*; Ihara, Satoshi*; Oka, Kiyoshi; Seki, Takeshi; Akatsu, Tomohiro; Matsumura, Akira*
no journal, ,
no abstracts in English
Watanabe, Shinya*; Akutsu, Hiroyoshi*; Oka, Kiyoshi; Seki, Takeshi*; Akatsu, Tomohiro*; Tanaka, Hidemine*; Yamamoto, Tetsuya*; Ihara, Satoshi*; Matsumura, Akira*
no journal, ,
no abstracts in English
Masumoto, Kiyoshi*; Onoe, Hironori; Kohashi, Akio; Yamamoto, Shinya*
no journal, ,
no abstracts in English
Yamamoto, Shinya*; Honda, Makoto*; Sakurai, Hideyuki*; Onoe, Hironori; Masumoto, Kiyoshi*
no journal, ,
no abstracts in English
Onoe, Hironori; Yamamoto, Shinya*; Masumoto, Kiyoshi*; Kohashi, Akio; Saegusa, Hiromitsu
no journal, ,
no abstracts in English
Yamamoto, Shinya*; Honda, Makoto*; Sakurai, Hideyuki*; Onoe, Hironori; Masumoto, Kiyoshi*
no journal, ,
no abstracts in English
Kohashi, Akio; Onoe, Hironori; Yamamoto, Shinya*; Honda, Makoto*; Sakurai, Hideyuki*; Masumoto, Kiyoshi*
no journal, ,
no abstracts in English
Ozaki, Yusuke; Kohashi, Akio; Onoe, Hironori; Yamamoto, Shinya*; Masumoto, Kiyoshi*
no journal, ,
The objective of this study is verification of feasibility to estimate hydraulic conductivity with inversion method of water head data in fault zone. Hydraulic conductivity in a fault zone is focused on as a target of inversion because the fault would significantly affect a water head field. A series of numerical test with synthetic model is performed under the condition that the number of fault to estimate hydraulic conductivity and the degree of freedom of hydraulic conductivity distribution in a fault zone is different. The information of hydraulic conductivity outside the faults and location of fault is given to the inversion a priori. Our inversion results shows that the accuracy of estimation is improved by constrain to the number of fault to estimate the hydraulic conductivity and freedom of hydraulic conductivity distribution in a fault. In addition, the number of fault to estimate the hydraulic conductivity should be limited for the certain estimation of hydraulic conductivity in all faults.
Yamamoto, Shinya*; Sakurai, Hideyuki*; Onoe, Hironori; Masumoto, Kiyoshi*
no journal, ,
no abstracts in English
Ozaki, Yusuke; Kohashi, Akio; Onoe, Hironori; Yamamoto, Shinya*; Sakurai, Hideyuki*; Masumoto, Kiyoshi*
no journal, ,
no abstracts in English
Yamamoto, Shinya*; Sakurai, Hideyuki*; Onoe, Hironori; Masumoto, Kiyoshi*
no journal, ,
The result of groundwater flow simulation includes the epistemic uncertainty due to the limited hydrogeological data available. Ensemble-based data assimilation scheme can reduce the uncertainty. Additionally, the analysis result of the data assimilation gives useful information for the layout design of the groundwater monitoring. We showed that the layouts determined by the ensemble of the assimilated results in the synthetic experiments are effective in reducing the uncertainty of hydrogeological model.
