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Imai, Hisashi*; Amemiya, Kiyoshi*; Matsui, Hiroya; Sato, Toshinori; Saegusa, Hiromitsu; Watanabe, Kunio*
Doboku Gakkai Rombunshu, C (Chiken Kogaku) (Internet), 69(3), p.285 - 296, 2013/07
The more accurate understanding and appropriate control of unsaturated area around tunnel excavated in deep rock-mass are required, for the geological isolation of radioactive waste project and also underground rock cavern storage project of liquefied petroleum gas. The numerical simulation of seepage flow is usually conducted to understand and evaluate the unsaturated zone around tunnel. The unsaturated parameters (such as moisture characteristic curve and relative permeability) and appropriate control of boundary condition are indispensable for the simulation. Authors developed methodology to measure unsaturated parameters utilizing the measuring method conventionally applied to soils and showed the efficiency of the method via a laboratory experiment. The idea of combining seepage face condition and flow rate fixed condition was derived, and the efficiency was shown in an model simulation. The two developments enabled the accurate estimation and understanding the evolution of unsaturated zone around tunnel.
Ijiri, Yuji*; Saegusa, Hiromitsu; Sawada, Atsushi; Ono, Makoto*; Watanabe, Kunio*; Karasaki, Kenji*; Doughty, C.*; Shimo, Michito*; Fumimura, Kenichi*
Journal of Contaminant Hydrology, 103(3-4), p.168 - 181, 2009/01
Times Cited Count：9 Percentile：29.04(Environmental Sciences)Qualitative evaluation of the effects of uncertainties originating from scenario development, conceptual models, and parameter values is an important subject in the area of safety assessment for high-level nuclear waste disposal. In this study, regional-scale groundwater flow analyses for the Tono area, Japan were conducted using three continuous models which were designed to handle heterogeneous porous media. We evaluated the simulation results to quantitatively analyze uncertainties originating from conceptual models. We found that uncertainties originating from conceptual models (1) greatly depend on boundary conditions and hydrological structures to be modeled, which are assigned by modelers, and (2) are larger than uncertainties originating from the variance in realizations of the Monte Carlo method in stochastic modeling.
Osawa, Hideaki; Ota, Kunio; Hama, Katsuhiro; Sawada, Atsushi; Takeuchi, Shinji; Amano, Kenji; Saegusa, Hiromitsu; Matsuoka, Toshiyuki; Miyamoto, Tetsuo; Toyoda, Gakuji; et al.
JAEA-Research 2008-085, 742 Pages, 2008/11
JAEA-Research-2008-085-1.pdf:26.22MBJAEA-Research-2008-085-2.pdf:16.64MBJAEA-Research-2008-085-3.pdf:28.27MB
This report shows the results the project for the establishment of comprehensive site characterization technology, entrusted from Natural Resources and Energy Agency, Ministry of Economy, Trade and Industry Natural Resources and Energy Agency in 2007.
Wakamatsu, Naonori*; Watanabe, Kunio*; Takeuchi, Shinji; Saegusa, Hiromitsu
Oyo Chishitsu, 49(3), p.126 - 138, 2008/08
A method to evaluate similarities of water level fluctuation between wells is proposed. Linear regression models with independent variable for meteorological condition such as rainfall and atmospheric pressure etc. are developed, and well similarity is estimated from model parameters (regression coefficients and model fitness) calculated by Genetic Algorism. The method was applied to the twelve wells in Tono area, central Japan. Although groundwater level fluctuation is primarily affected by rainfall and pumping conditions, different geological conditions would cause different types of water level response to the factors. Models using preceding rainfalls and atmospheric pressure and models using water level in other wells suggested that water level fluctuation data of the wells are classified into groups which reflect difference in pressure propagation for rain infiltration among the geological units.
Maekawa, Keisuke; Sawada, Atsushi; Ota, Kunio; Kurikami, Hiroshi; Kunimaru, Takanori; Funaki, Hironori; Hama, Katsuhiro; Takeuchi, Shinji; Amano, Kenji; Saegusa, Hiromitsu; et al.
JAEA-Review 2007-011, 8 Pages, 2007/03
JAEA-Review-2007-011.pdf:0.66MB
In the current programme for research and development on the technical aspects of geological disposal, it is of significance to establish techniques for evaluating solute transport with a direct link to surface-based investigations through the processes of data interpretation, modelling and parameter designation within the immediate five years following the H17 Project. This report presents a basic approach to promoting multidisciplinary research activities involving field investigations and relevant solute transport analysis.
Ota, Kunio; Sato, Toshinori; Takeuchi, Shinji; Iwatsuki, Teruki; Amano, Kenji; Saegusa, Hiromitsu; Matsuoka, Toshiyuki; Onoe, Hironori
JNC TN7400 2005-023, 373 Pages, 2005/09
Techniques for characterising the deep geological environment in a rational and effective manner have been established through the surface-based investigations of the crystalline basement with sedimentary overburden at the Tono area, which can particularly address the key aspects to be answered for safety assessment, the construction of underground facility and environmental impact assessment. The surface-based investigations have been carried out at several scales, regional, local, site and block, by taking an iterative approach through which the depth of understanding and the degree of uncertainty can be evaluated and the next investigation issues prioritised. The link between field investigations and the key aspects through interpretation, conceptualisation and modelling processes within the iterative approach can eventually be illustrated as a "Geosynthesis Flow" diagram at each exploration step. In addition, a technical basis for preliminary investigations has been developed. The rationale for the investigation, interpretation, conceptualisation and modelling processes and the technical expertise gained through the processes as well as the improvement of investigation and modelling techniques can be described in detail.
Iwatsuki, Teruki; Ota, Kunio; Takeuchi, Shinji; Amano, Kenji; Takeuchi, Ryuji; Saegusa, Hiromitsu; Matsuoka, Toshiyuki; Osawa, Hideaki
JNC TN7400 2005-013, 54 Pages, 2005/09
JNC-TN7400-2005-013.pdf:13.29MBJNC-TN7400-2005-013(errata).pdf:0.08MB
This report mainly summarizes the results of research in DH-14 and DH-15 boreholes in fiscal year 2004 which were carried out to support and improve the results in fiscal year 2003. The geological and geophysical investigation, and borehole investigation during the surface-based investigations provide the pragmatic distribution of hydrogeological structure that may control regional groundwater hydrology.
Makino, Hitoshi; Sawada, Atsushi; Maekawa, Keisuke; Shibata, Masahiro; Sasamoto, Hiroshi; Yoshikawa, Hideki; Wakasugi, Keiichiro; Koo, Shigeru*; Hama, Katsuhiro; Kurikami, Hiroshi; et al.
JNC TN1400 2005-021, 148 Pages, 2005/09
JNC-TN1400-2005-021.pdf:32.85MB
None
Hanamuro, Takahiro; Higashihara, Hiromichi*; Koide, Kaoru; Ota, Kunio; Kenji, Amano,; Saegusa, Hiromitsu; Iwatsuki, Teruki
JNC TN7400 2005-029, 54 Pages, 2005/08
JNC-TN7400-2005-029.pdf:31.49MB
None
Hiroyuki, Mochida; Ota, Kunio; Kenji, Amano; Saegusa, Hiromitsu; Sato, Toshinori; Iwatsuki, Teruki; Tsuruta, Tadahiko
JNC TN7410 2005-001, 32 Pages, 2005/05
JNC-TN7410-2005-001.pdf:7.06MB
None
Watanabe, Kunio; Gautam, M. R.*; Saegusa, Hiromitsu
JNC TY7400 2003-002, 68 Pages, 2003/05
JNC-TY7400-2003-002.pdf:2.32MB
The results of groundwater flow modeling are to be justified using groundwater monitoring data in the hydrogeological characterization. On the other hand, hydraulic continuities of the geological structures, all of which are considered to have great effect on groundwater flow and/or groundwater quality, are to be estimated using the groundwater flow monitoring data with hydraulic response to some impacts such as borehole drilling, pumping test and so on. Therefore, the groundwater monitoring is important for characterizing the geological and hydrogeological environments. In order to characterize of hydrogeological environment using the monitoring data, it is important to evaluate the influence of artifical and natural impact on the monitoring data. In this study, the following three research works were carried out based on the groundwater monitoring data collected at the Tono area. Artifical Neural Network (ANN) was adopted as the tool for monitoring data analysis.Runoff analysis for assessment of importance of soil moisture on runoff estimation in a catchment Analysis of water level fluctuation for determination influence factors in the water level fluctuation and for filtering out the influence factors from the water level data Analysis of hydraulic pressure fluctuation in deep geological formations for hydrogeological characterization and assessment of human influence on the pore pressure in deep formation Through this study, applicability of ANN for analysis and interpretation of the groundwater monitoring data could be confirmed and methodology for utilization the monitoring data for understanding and characterization of hydrogeological environment could be developed.
Gautam, M. R.*; Watanabe, Kunio; Saegusa, Hiromitsu
Journal of Hydrology, 235, p.117 - 136, 2000/00
Times Cited Count：55 Percentile：84.12(Engineering, Civil)None
Gautam, M. R.*; Watanabe, Kunio; Saegusa, Hiromitsu
Sui Kogaku Rombunshu, 44, p.127 - 132, 2000/00
None
Nishimura, Akihiko; Takenaka, Yusuke*; Saegusa, Kunio; Hiroki, Seiji; Fujino, Toru*; Amano, Tamio*; Okazaki, Toru*; Yoshida, Kazuo*
no journal, ,
no abstracts in English
Takeuchi, Shinji; Sato, Toshinori; Iwatsuki, Teruki; Mikake, Shinichiro; Amano, Kenji; Saegusa, Hiromitsu; Ota, Kunio
no journal, ,
no abstracts in English
Saegusa, Hiromitsu; Ota, Kunio; Niizato, Tadafumi; Amano, Kenji; Yamanaka, Yoshiaki; Maekawa, Keisuke; Kunimaru, Takanori; Hama, Katsuhiro
no journal, ,
no abstracts in English
Hama, Katsuhiro; Amano, Kenji; Saegusa, Hiromitsu; Miyamoto, Tetsuo; Toyoda, Gakuji; Ota, Kunio
no journal, ,
none
Nakajima, Makoto*; Atsumi, Hiroyuki*; Seno, Shoji*; Masumoto, Kazuhiko*; Kawabata, Junichi*; Kunimaru, Takanori; Onoe, Hironori; Saegusa, Hiromitsu; Hayano, Akira; Watanabe, Kunio*
no journal, ,
Solute transport conceptual models for crystalline rock environment is developed in the Mizunami Underground Research Laboratory (MIU) project conducted by Japan Atomic Energy Agency (JAEA) in order to construct scientific and technological basis for geological disposal of High-level Radioactive Waste (HLW). In this study, discrete fracture network model is developed using channel network to establish hydro-geological model and analyze factors in the solute transport behavior.
Atsumi, Hiroyuki*; Nakajima, Makoto*; Seno, Shoji*; Masumoto, Kazuhiko*; Kawabata, Junichi*; Onoe, Hironori; Kunimaru, Takanori; Sawada, Atsushi; Saegusa, Hiromitsu; Watanabe, Kunio*
no journal, ,
Solute transport conceptual models for crystalline rock environment is developed in the Mizunami Underground Research Laboratory (MIU) project conducted by Japan Atomic Energy Agency (JAEA) in order to construct scientific and technological basis for geological disposal of High-level Radioactive Waste (HLW). In this study, groundwater flow analysis and solute transport analysis are conducted to analyze factors in the solute transport behavior using hydro-geological model composed of channel network.
Watanabe, Kunio*; Morita, Yutaka*; Takeuchi, Shinji; Saegusa, Hiromitsu
no journal, ,
no abstracts in English
