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Journal Articles

Development of a methodology for the characterisation of long-term geosphere evolution, 1; Impacts of natural events and processes on the geosphere evolution of coastal setting, in the case of Horonobe area

Niizato, Tadafumi; Imai, Hisashi*; Maekawa, Keisuke; Yasue, Kenichi; Kurikami, Hiroshi; Shiozaki, Isao*; Yamashita, Ryo*

Proceedings of 19th International Conference on Nuclear Engineering (ICONE-19) (CD-ROM), 10 Pages, 2011/10

A critical issue for building confidence in the long-term safety of geological disposal is to demonstrate the stability of the geosphere, taking into account its likely future evolution. This study aims to establish comprehensive techniques for characterising the overall evolution of coastal sites through studying the palaeohydrogeological evolution in the coastal system around the Horonobe area, Hokkaido, northern Japan. Information on natural events and processes related to the palaeohydrogelogical evolution of the area have been integrated into the conceptual models that indicates the temporal and spatial sequences of the events and processes, such as climatic and sea-level changes, palaeogeography, and geomorphological and geological evolution in the area. The groundwater flow simulation, which is based on the conceputualisation of the long-term geosphere evolution, shows the sensitivities of natural events and processes on groundwater flow properties in a coastal setting.

JAEA Reports

Study on the effects of long-term evolution of geological environment on groundwater flow (Contract research)

Imai, Hisashi*; Yamashita, Ryo*; Shiozaki, Isao*; Urano, Kazuhiko*; Kasa, Hiroyoshi*; Maruyama, Yoshio*; Niizato, Tadafumi; Maekawa, Keisuke

JAEA-Research 2009-001, 116 Pages, 2009/03

JAEA-Research-2009-001.pdf:32.12MB

Evaluation of long-term geological evolution and its impact on groundwater flow is one of the major themes within the frame of Horonobe Underground Research Laboratory Project. For the purpose of development of a groundwater flow modeling methodology considering the effects of long-term geological evolution, following three items were studied: (1) Upgrade of SMS (Sequential Modeling System of geo-environmental evolution impact on groundwater flow) which was developed in 2006 FY; (2) Groundwater flow simulation under more realistic conditions of geological structures and hydrogeological conditions; and (3) Sensitivity study of geo-environmental evolution impacts on groundwater flow. The studies showed following suggestive results. (1) Development of a precise time step setting enabled to narrow the gaps in simulated head between time steps in which the model configuration used to deformed. (2) Several aspects have been found from studies on impact factors such as deposition on pore pressure, recharge rate and difference in density of saline groundwater. For evaluation of pore pressure induced by deposition, it is necessary to model the porosity and permeability variation considering the exceed pore pressure change. The setting of recharge rate during the Ice Age influence the characteristics of groundwater flow in coastal and hilly areas. The density of groundwater is not so influential as topological potential factors, however it is effective for the characteristics of groundwater flow in coastal area and intrusion of recharge water from ground surface. (3) The sensitivity study on faulting characteristics indicated that the two types of fault configuration and the hydraulic conductivity setting considered are not influential on the nature of groundwater flow above the depth of 500 m.

Journal Articles

Analytical study of groundwater flow evolution due to climatic and sealevel change

Kurikami, Hiroshi; Yasue, Kenichi; Niizato, Tadafumi; Imai, Hisashi*; Shiozaki, Isao*; Yamashita, Ryo*

Chikasui Ryudo Kaiseki To Moderuka Ni Kansuru Shimpojium Happyo Rombunshu, p.59 - 66, 2007/01

no abstracts in English

JAEA Reports

Investigation Research on the Evaluation of a Coupled Thermo-Hydro-Mechanical-Chemical Phenomena (IV) -Result Report-

Ishihara, Yoshinao*; Chijimatsu, Masakazu*; Amemiya, Kiyoshi*; Shiozaki, Isao*; Ito, Takaya*

JNC TJ8400 2004-015, 192 Pages, 2005/02

JNC-TJ8400-2004-015.pdf:1.98MB

In order to realize a coupling analysis in the near field of the geological disposal system, the coupling analysis code "COUPLYS (Coupling Analysis System)" on the Thermo-Hydro-Mechanical-Chemical (THMC) phenomena by THAMES, Dtransu and phreeqc, which are existing analysis code, is developed in this study.

JAEA Reports

Renewal of the existing hydrogeological model and groundwater flow simulation

Imai, Hisashi*; Shiozaki, Isao*

JNC TJ5440 2004-001, 80 Pages, 2004/11

JNC-TJ5440-2004-001.pdf:34.21MB

To understand the deep underground geological environment around the Horonobe Underground Research Laboratory, and to estimate the underground facility construction effect on the geological environment, renewal of the existing hydrogeological model and groundwater flow simulations were carried out.

JAEA Reports

Investigation Research on the Evaluation of a Coupled Thermo-Hydro-Mechanical-Chemical Phenomena (III) -Result Report-

Ishihara, Yoshinao*; Chijimatsu, Masakazu*; Amemiya, Kiyoshi*; Shiozaki, Isao*; Ito, Takaya*

JNC TJ8400 2004-004, 625 Pages, 2004/02

JNC-TJ8400-2004-004.pdf:7.37MB

In order to realize a coupling analysis in the near field of the geological disposal system, the coupling analysis code on the thermo-hydro-mechanical-chemical phenomena by THAMES, Dtransu and phreeqc, which are existing analysis code, is developed in this study. And we carried out the case analysis on the thermo-hydro-mechanical-chemical phenomena by this code.(1).Some supporting module, which includes transfer of dissolution concentration and total concentration (dissolution + precipitation concentration), was prepared as a functional expansion. And in order to treat de-gases and gases diffusion, accumulation and dilution phenomena, we have modified mass transport analysis code.(2).We have modified reactive transport module to treat ionic exchange, surface reaction and kinetic reaction in the each barrier.(3).We have prepared hydraulic conductivity module of buffer material depending on change of dry density due to chemical equilibrium (dissolution and precipitation of minerals), degradation of buffer material such as Ca-type bentonite and change of concentration of NaCl solutions. After THAMES, Dtransu, phreeqc and hydraulic conductivity module were installed in the COUPLYS, verification study was carried out to check basic function. And we have modified COUPLYS to control coupling process.(4).In order to confirm the applicability of the developed THMC analysis code, we have carried out case analysis on 1-dimensional and 3-dimensional model which including vitrified waste, over-pack, buffer material and rock in the HLW near-field.

JAEA Reports

Investigation Research on the Evaluation of a Coupled Thermo-Hydro-Mechanical-Chemical Phenomena (II); Outline Report

Ishihara, Yoshinao*; Chijimatsu, Masakazu*; Neyama, Atsushi*; Tanaka, Yumiko*; Amemiya, Kiyoshi*; Shiozaki, Isao*; Ito, Takaya*

JNC TJ8400 2003-033, 118 Pages, 2003/02

JNC-TJ8400-2003-033.pdf:1.66MB

In order to realize a coupling analysis in the near field of the geological disposal system, the coupling analysis code on the thermo-hydro-mechanical-chemical phenomena by THAMES, Dtransu and phreeqe60, which are existing analysis code, is developed in this study. And we carried out the case analysis on the thermo-hydro-mechanical-chemical phenomena by this code.

JAEA Reports

Investigation Research on the Evaluation of a Coupled Thermo-Hydro-Mechanical-Chemical Phenomena (II) - Result Report-

Ishihara, Yoshinao*; Chijimatsu, Masakazu*; Neyama, Atsushi*; Tanaka, Yumiko*; Amemiya, Kiyoshi*; Shiozaki, Isao*; Ito, Takaya*

JNC TJ8400 2003-032, 237 Pages, 2003/02

JNC-TJ8400-2003-032.pdf:2.5MB

In order to realize a coupling analysis in the near field of the geological disposal system, the coupling analysis code on the thermo-hydro-mechanical-chemical phenomena by THAMES, Dtransu and phreeqe60, which are existing analysis code, is developed in this study. And we carried out the case analysis on the thermo-hydro-mechanical-chemical phenomena by this code.

JAEA Reports

Study on regional ground water flow analysis method in sedimentary rock mass

Imai, Hisashi*; Yamashita, Ryo*; Amemiya, Kiyoshi*; Shiozaki, Isao*

JNC TJ1410 2001-002, 318 Pages, 2001/08

JNC-TJ1410-2001-002.pdf:34.33MB

Oral presentation

Frequency distribution of hot spring boring in Japan

Nagasawa, Hirokazu; Takeda, Seiji; Kimura, Hideo; Shiozaki, Isao*

no journal, , 

no abstracts in English

Oral presentation

Groundwater flow analysis considering topographical and geological transitions

Imai, Hisashi*; Shiozaki, Isao*; Yamashita, Ryo*; Kurikami, Hiroshi; Niizato, Tadafumi; Maekawa, Keisuke; Yasue, Kenichi

no journal, , 

no abstracts in English

Oral presentation

The Effects of long-term evolution of geological environment on groundwater flow; A Case study on Horonobe area

Maekawa, Keisuke; Niizato, Tadafumi; Kurikami, Hiroshi; Asamori, Koichi; Imai, Hisashi*; Shiozaki, Isao*

no journal, , 

no abstracts in English

Oral presentation

Synthesizing geoscientific data into a site model on a long-term evolution of the geological environments, Horonobe URL, Hokkaido

Niizato, Tadafumi; Maekawa, Keisuke; Yasue, Kenichi; Asamori, Koichi; Kurikami, Hiroshi; Imai, Hisashi*; Shiozaki, Isao*

no journal, , 

This study presents an application of a combined method based on the Data Flow Diagram (a Geosynthesis methodology developed in previous site-investigation programs, for example the NAGRA Wellenberg project in Switzerland) and the Process Diagrams (or Interaction Matrix; developed in the SKB Safety Report 97) for a sequence of field investigation and analysis activities.

Oral presentation

Method for characterizing fractures and water-conducting features in different scales, 1

Takeuchi, Shinji; Saegusa, Hiromitsu; Shiozaki, Isao*; Hosoya, Shinichi*; Osada, Masahiko*

no journal, , 

no abstracts in English

Oral presentation

Study on the impact of long-term evolution of geological environment on groundwater flow

Maekawa, Keisuke; Niizato, Tadafumi; Imai, Hisashi*; Shiozaki, Isao*; Yamashita, Ryo*

no journal, , 

no abstracts in English

Oral presentation

Study on excess pore pressure in deep underground of sedimentary rock area

Yamashita, Ryo*; Imai, Hisashi*; Shiozaki, Isao*; Maekawa, Keisuke; Niizato, Tadafumi

no journal, , 

no abstracts in English

Oral presentation

Development and issues of analytical method of groundwater flow considering long-term evolution of geological environment

Imai, Hisashi*; Shiozaki, Isao*; Yamashita, Ryo*; Maekawa, Keisuke; Niizato, Tadafumi

no journal, , 

no abstracts in English

Oral presentation

Study of long-term underground water flow system, 2; Attempt of underground water flow movement evaluation that considers climatic variation of coming of the cold period etc

Fuchiwaki, Hirotaka; Munakata, Masahiro; Kimura, Hideo; Imai, Hisashi*; Shiozaki, Isao*; Yamashita, Ryo*

no journal, , 

It is thought that in an external factor that influences the underground flow, there is a climatic variation repeated at the cycle of the order of 100,000 years, the following phenomena are caused by this climatic variation, and it influences the underground flow. It is thought that the following phenomena are caused by this climatic variation, and it influences the underground flow. (1) Development and disappearance of glacier, (2) Change in precipitation, (3) Decrease in amount of training because of development of frozen soil, (4) Sea-level rhythms, (5) Upheaval and erosion by gaining the weight to the earth's crust according to development of river and disappearance, (6) Dilution of seawater according to glacier disappearance, etc. The analytical result and the evaluation are announced.

Oral presentation

Improvement for versatility of analytical method of groundwater flow considering a long-term evolution of geological environment

Maekawa, Keisuke; Niizato, Tadafumi; Imai, Hisashi*; Shiozaki, Isao*; Yamashita, Ryo*

no journal, , 

no abstracts in English

Oral presentation

Groundwater flow analysis considering long-term geological and environmental evolution; Influence estimation of hypothetical environmental fluctuation

Shiozaki, Isao*; Yamashita, Ryo*; Oyama, Takuya; Niizato, Tadafumi; Amano, Kenji; Imai, Hisashi

no journal, , 

no abstracts in English

21 (Records 1-20 displayed on this page)