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Sakai, Ryutaro; Munakata, Masahiro; Kimura, Hideo
no journal, ,
no abstracts in English
Matsuzaki, Tatsuji; Iwatsuki, Teruki; Nakayasu, Akio; Semba, Takeshi
no journal, ,
no abstracts in English
Iwatsuki, Teruki; Nakayasu, Akio; Hama, Katsuhiro; Mizuno, Takashi
no journal, ,
Expert system for hydrochemical investigations were developed based on knowledge from scientific studies at Mizunami and Horonobe URL. The knowledge on hydrochemical investigation are classified into (1) how to construct the conceptual model during literature survey, (2) planning method on hydrochemical investigation, (3) know-how on hydrochemical investigation, (4) data analysis and modelling, (5) estimation of long-term hydrochemical change.
Yamada, Kunimi; Murakami, Masaki*; Tagami, Takahiro*; Yamada, Ryuji*
no journal, ,
no abstracts in English
Nakayasu, Akio; Iwatsuki, Teruki; Tachibana, Shoko*; Yang, H.*
no journal, ,
no abstracts in English
Amano, Yuki; Nanjo, Isao; Iwatsuki, Teruki; Sasaki, Yoshito; Asano, Takahiro; Terashima, Motoki; Nagaoka, Toru*; Nakamura, Takamichi*; Yoshikawa, Hideki; Aoki, Kazuhiro
no journal, ,
In-situ experiment of redox reaction was conducted to assess the redox buffur capacity of water-rock-microbes system in the subsurface environment at 140 m depth of Horonobe Underground Research Laboratory. Dissolved oxygen was injected into a borehole, and the physico-chemical parameters (i.e. pH, ORP, DO, EC, etc.) and geochemical composition, microbial cell number, and microbial community structure were monitored continuously during the groundwater circulation. DO concentration could not detected after 10 hours from the injection. The concentration of Fe(II) was decreased with time, then the injected oxygen could be consumed by Fe(II). The rate of oxygen consumption during the experiment was 9.64 mg/L/day. The Eh value become stable at -208 mV after 5 days, then it showed that the reducing condition would be recovered quickly after closed condition.
He/
He ratios in groundwatersUmeda, Koji; Ninomiya, Atsushi; Asamori, Koichi; Negi, Tateyuki
no journal, ,
no abstracts in English
Asamori, Koichi; Negi, Tateyuki; Umeda, Koji; Ninomiya, Atsushi
no journal, ,
no abstracts in English
Kusano, Tomohiro; Yasue, Kenichi; Kosaka, Hiroshi; Saegusa, Hiromitsu; Takeuchi, Ryuji; Onoe, Hironori*; Shiomi, Tetsuya*; Tajikara, Masayoshi*
no journal, ,
In this study, we focused on long-term topography change due to uplift, denudation and climate change with ice age and interglacial cycles of natural phenomena, to estimate influence to groundwater flow characteristics, we estimated paleo-topography and paleo-climate and operated groundwater flow simulation in Tono area. Based on terrace area distribution scattered along river, we estimated paleo-topography in three dimensions with DEM data and GIS. we estimated climate of glacial and interglacial age by near-surface hydrological observation data, pollen fossil analysis and expenditure calculation based on them. In hydraulics geological structure model with paleo-topography, we operated groundwater flow simulation on three-dimensional saturation and unsaturation in steady state. It is thought less effect on groundwater flow characteristics change in current terrain from middle terrace area formation. It is important to evaluate influence of groundwater flow characteristics if that form mountains or hills. Change in groundwater flow characteristics with change of recharge rate is limited to high-altitude area compared to ramifications of the mountains.
Tanikawa, Shinichi; Yasue, Kenichi; Sanga, Tomoji*; Umeda, Koji
no journal, ,
JP, 2009-239446 
Patent publication (In Japanese)
no abstracts in English
Iwatsuki, Teruki; Amano, Yuki; Yoshikawa, Hideki
no journal, ,
Water-mineral-microbe systems were studied at Mizunami and Horonobe area. In the granitic rock at Mizunami area, interaction among carbonate and sulphide minerals, nitrogen related bacteria and sulphate reducing bacteria is dominant reaction, while interaction among fossil seawater, carbonate and sulphide minerals, nitrogen related bacteria and sulphate reducing bacteria is dominant reaction at sedimentary rocks in Horonobe area.
Takeuchi, Ryuji; Takeuchi, Shinji
no journal, ,
no abstracts in English
Mizuno, Takashi; Takeuchi, Shinji; Abdelgawad, A.*; Fukushi, Keisuke*; Watanabe, Kunio*
no journal, ,
no abstracts in English
Toya, Naruhisa*; Takeuchi, Ryuji; Takeuchi, Shinji; Daimaru, Shuji; Nakano, Katsushi*; Kikuyama, Seiji*
no journal, ,
no abstracts in English
Nakajima, Takahiro*; Kunitomo, Takahiro*; Yamada, Osamu; Asamori, Koichi; Yabuuchi, Satoshi; Shigeta, Naotaka; Kumazawa, Mineo*
no journal, ,
Development of monitoring technologies for geological environment is one of the subjects of this project. ACROSS was selected as the monitoring tool. We settled two current dipole sources and three receiver stations. We carried out a trial observation in the frequency range 2.5-140 Hz for more than one year. We observed the EM-ACROSS signal at all stations, and obtained a set of reliable components of the tensor transfer function. Form the analysis of the averaged transfer functions it was estimated that the conductivity decrease with depth. We also investigated temporal variations of the transfer function. The correlation between the observed temporal variations and seasonal environmental influence were seen.
Doke, Ryosuke; Yasue, Kenichi; Niizato, Tadafumi; Nakayasu, Akio; Umeda, Koji; Osawa, Hideaki
no journal, ,
Decision process and technical know-how on an estimation of uplift rate by using fluvial terraces as indicator, one of the researches on the long-term stability of the geological environments conducted by JAEA, have been clarified for expert system of "Information Synthesis and Interpretation System (ISIS)". A sequence of the research from "extraction of pre-existing information" to "calculation of uplift rates" and decision processes during the investigation and analysis have been illustrated as the "task flow" and "flow diagram of decision process", respectively. These "tacit knowledge" externalized by application of knowledge engineering methods have been integrated into the expert system of ISIS through the construction of IF-THEN rule-base.
Matsuoka, Toshiyuki; Amano, Kenji; Osawa, Hideaki; Semba, Takeshi
no journal, ,
Japan Atomic Energy Agency (JAEA) has now been developed Information Synthesis and Interpretation System (ISIS) which is the system to support the stepwise "optimization" of the site characterization plan. As part of the development of ISIS, the knowledge on construction of site descriptive model, which includes technical know-how and decision process, are provided from the experience of generic URLs at Horonobe and Mizunami to support the site characterization on the literature survey phase. In this Study, the work flow of geological modeling utilizing existing information is introduced.
Saegusa, Hiromitsu; Maekawa, Keisuke; Oyama, Takuya; Semba, Takeshi
no journal, ,
Technical know-how and decision process of techniques to be used in surface-based site characterization are being specified in order to develop knowledge base. In this study, the detail work and its procedure regarding setting of area for modeling of geological environment and groundwater flow modeling for hydrogeological characterizations have been summarized based on experience on Mizunami and Horonobe underground research laboratory projects. The results of the study are expected to be used on literature survey stage in implementing disposal of high-level radioactive waste.
Takeuchi, Shinji; Saegusa, Hiromitsu; Osawa, Hideaki; Semba, Takeshi
no journal, ,
A series of the geological environmental modeling, investigation planning and field investigations should be crucial procedure for increasing the understanding of the site of interest. A strategic procedure on the site descriptive modeling to the investigation planning has been established based on the experiences, technical knowhow and decision-making process accumulated from the two URLs (Horonobe and Mizunami). The obtained procedure would be expected to be used for the planning of the preliminary investigation area and safety guidelines.
Semba, Takeshi; Osawa, Hideaki; Hama, Katsuhiro; Takeuchi, Shinji; Iwatsuki, Teruki; Sawada, Atsushi; Umeki, Hiroyuki
no journal, ,
Japan Atomic Energy Agency has now been developed Information Synthesis and Interpretation System (ISIS) which supports flexible planning of site characterization taking into account of changes in scientific understandings and socio-political conditions. This paper describes the progress of development of ISIS.