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Journal Articles

Development of evaluation method for variability of groundwater flow conditions associated with long-term topographic change and climate perturbations

Onoe, Hironori; Kosaka, Hiroshi*; Matsuoka, Toshiyuki; Komatsu, Tetsuya; Takeuchi, Ryuji; Iwatsuki, Teruki; Yasue, Kenichi

Genshiryoku Bakkuendo Kenkyu (CD-ROM), 26(1), p.3 - 14, 2019/06

In this study, it is focused on topographic changes due to uplift and denudation, also climate perturbations, a method which is able to assess the long-term variability of groundwater flow conditions using the coefficient variation based on some steady-state groundwater flow simulation results was developed. Spatial distribution of long residence time area which is not much influenced due to long-term topographic change and recharge rate change during the past one million years was able to estimate through the case study of the Tono area, Central Japan. By applying this evaluation method, it is possible to identify the local area that has low variability of groundwater flow conditions due to topographic changes and climate perturbations from the regional area quantitatively and spatially.

Journal Articles

Program of the analysis and research laboratory for Fukushima-Daiichi and advanced techniques to be applied in the laboratory

Sekio, Yoshihiro; Yoshimochi, Hiroshi; Kosaka, Ichiro; Hirano, Hiroyasu; Koyama, Tomozo; Kawamura, Hiroshi

Proceedings of 52nd Annual Meeting of Hot Laboratories and Remote Handling Working Group (HOTLAB 2015) (Internet), 8 Pages, 2015/09

Due to the Fukushima Daiichi Nuclear Power Plant accident in March 2011, the safe and secure implementations of the decommissioning for Fukushima Daiichi Nuclear Power Plant has been positioned as the urgent tasks in Japan. Japan Atomic Energy Agency has a critical mission of analysing radioactive wastes having generated by the accident for long-term storage and disposal methods. This will be performed in two hot laboratories to be constructed in Okuma Analysis and Research Center at Fukushima Daiichi Nuclear Power Plant site. In one laboratory, radioactive wastes such as rubbles and secondary wastes will be treated, whereas debris such as fuel debris and high dose structural materials will be handled in the other laboratory. The detail considerations for advanced techniques and experimental apparatus to be installed are underway.

JAEA Reports

Study of hydrogeology in the Mizunami Underground Research Laboratory Project; Hydrogeological modeling at site scale in Phase II

Onoe, Hironori; Kosaka, Hiroshi*; Takeuchi, Ryuji; Saegusa, Hiromitsu

JAEA-Research 2015-008, 146 Pages, 2015/08

JAEA-Research-2015-008.pdf:76.46MB

Mizunami Underground Research Laboratory (MIU) Project is being carried out by Japan Atomic Energy Agency (JAEA) in the Cretaceous Toki granite in the Tono area, central Japan. The MIU Project has three overlapping phases: Surface-based Investigation (Phase I), Construction (Phase II) and Operation (Phase III). In this study, calibration of hydrogeological model and groundwater flow simulation using the data obtained by the Phase I and Phase II were carried out in order to develop the methodology for construction and update of hydrogeological model on Site Scale. As a result, hydrogeological model on Site Scale, which is able to simulate comprehensively the obtained data regarding groundwater pressure distribution before excavation of the MIU facilities, hydraulic responses and inflow volume during excavation of the MIU facilities, was constructed.

JAEA Reports

Study on hydrogeology on the Mizunami Underground Research Laboratory Project; Groundwater flow and particle tracking simulation on site scale

Kosaka, Hiroshi; Saegusa, Hiromitsu; Kurihara, Arata*; Onoe, Hironori

JAEA-Research 2012-012, 100 Pages, 2012/07

JAEA-Research-2012-012.pdf:17.95MB

In this study, groundwater flow and particle tracking simulations using hydrogeological models have been carried out in order to evaluate the relationship between understanding of groundwater flow characteristics and the amount of information that is increased by the progress of investigations. The influences of difference of the method for interpretation of hydrogeology have been also evaluated. As a result, uncertainties of the groundwater flow characteristics were decreased by increasing the amount of information. It was also found that the distribution of large-scale discrete features and the heterogeneity of groundwater flow characteristics affect the groundwater flow characteristics. Furthermore, the method to identify the target of further investigation and to make plan for the investigation were proposed.

JAEA Reports

Study on hydrogeology on Mizunami Underground Research Laboratory Project; Hydrogeological modeling and groundwater flow simulation based on data of hydraulic and geochemical impacts during the construction of the MIU facilities; FY2008

Shimo, Michito*; Kumamoto, So*; Kosaka, Hiroshi; Onoe, Hironori; Saegusa, Hiromitsu; Mizuno, Takashi; Oyama, Takuya

JAEA-Research 2012-004, 126 Pages, 2012/04

JAEA-Research-2012-004.pdf:14.3MB

One of the goals of Mizunami Underground Research Laboratory (MIU) Project is to develop technical basis for investigation, analysis and evaluation technologies for understanding deep underground geological environment in various scales. Understanding groundwater flow system is one of the important issues in the project, and to achieve this purpose, technologies for a hydrogeological model and the groundwater flow simulation technique, have to be established. In this study, hydrogeological modeling and groundwater flow simulations have been carried out in order to predict hydraulic and geochemical impacts around the MIU Construction Site and inflow rate into the MIU facilities. As a result of this study, the significant hydrogeological structures could be estimated. The inflow rate into the MIU facilities and hydraulic and geochemical impacts with the MIU facilities construction could be predicted. The effect of pre-grouting to the MIU facilities could be also confirmed.

JAEA Reports

Estimation of runoff volume by geomorphometry and statistics analysis using digital elevation model in Tono area

Takeuchi, Ryuji; Kosaka, Hiroshi; Sato, Atsuya*; Tomiyama, Shingo*; Kageyama, Soichiro*; Ikeda, Makoto*

JAEA-Research 2011-008, 77 Pages, 2011/06

JAEA-Research-2011-008.pdf:4.76MB

Subsurface water balance observation is a kind of methods in order to estimate a recharge rate. Results of the observation are affected by the various factors such as the scale, the topography, a geological feature, the climate. Therefore, the observation in the regional scale is necessary at many basins. The purpose of this study is to confirm the applicability of the method for the evaluation of runoff volume, which is one of parameters to evaluate the recharge rate by surface water balance observation, by geomorphometry and statistical analyses using digital elevation model (DEM). The runoff index which is the original indicator to evaluate the degree of flow rate on a catchment was calculated by the comparison between the result of geomorphometry and statistics analyses, and the observed data of river flow rate in the monitoring stations. Using this index, the flow rate of the Hiyoshi River was evaluated. The evaluated flow rate was about 60% against the observed flow rate.

Journal Articles

Development of methodology for the characterisation of the long-term geosphere evolution, 2; Estimation of the long-term evolution of groundwater flow conditions in a Tono area case study

Kosaka, Hiroshi; Saegusa, Hiromitsu; Yasue, Kenichi; Kusano, Tomohiro; Onoe, Hironori

Proceedings of 19th International Conference on Nuclear Engineering (ICONE-19) (CD-ROM), 9 Pages, 2011/05

The methodology for estimation of the long-term evolution of groundwater flow conditions are being developed using approaches on the basis of deductive and inductive methods in the case of Tono area. Based on the studies using the approach on the basis of deductive method, it has been confirmed that the method combining physical modeling of topographic change and groundwater flow simulations is useful for estimating of changes in groundwater flow conditions in the future due to topographic and climatic perturbations. Existing information for estimation of surface hydrological conditions, which are to be used for assignment of boundary conditions for the groundwater flow simulation, has been gathered from many sources and reviewed based on modern-analogue methods. In the studies using the approach on the basis of inductive method, paleo-hydrogeological studies have been carried out on several spatial and time scales. Through the study on the largest spatial scale, a methodology needed to understand changes of groundwater flow conditions due to long-term topographic change is proposed to efficiently identify the area to be carried out site characterization involving field investigations. And then, information to estimate the paleo-topography and paleo-climate has been obtained from literature surveys and field investigations. Through these studies, it has been confirmed that these two approaches are useful for estimation of the long-term evolution of deep groundwater flow conditions.

JAEA Reports

Study on hydrogeology on the Mizunami Underground Research Laboratory Project; Hydrogeological modeling and groundwater flow simulation for planning of long-term pumping test

Kosaka, Hiroshi; Saegusa, Hiromitsu; Onoe, Hironori; Takeuchi, Ryuji

JAEA-Research 2010-037, 42 Pages, 2011/01

JAEA-Research-2010-037.pdf:16.27MB

Mizunami Underground Research Laboratory (MIU) Project is being carried out by Japan Atomic Energy Agency (JAEA) in the Cretaceous Toki granite in the Tono area, central Japan. The MIU project is a broad scientific study of the deep geological environment as a component of the research and development supporting geological disposal of high-level radioactive wastes. One of the main goals of the project is to establish techniques for comprehensive investigation, analysis and assessment of the deep geological environment in fractured crystalline rock. In this study, hydrogeological modeling and groundwater flow simulation taking into consideration the long-term pumping test has been carried out in order to reflect making test specifications of long-term pumping test. The pumping test will be carried out using the borehole, which will be drilled from underground research gallery in fiscal 2010. In this groundwater flow simulation, the sensitive analysis focused on location of pumping interval along the borehole, pumping time and pumping flow rate was conducted to predict the influence of these test specifications on the pressure response in pressure monitoring boreholes. As a result, the different variations of pressure response were indicated by the differences of the location of pumping interval bounded by the fault. In addition, small effect of difference of pumping time (2 weeks or 4 weeks) on pressure response was predicted. The recommendation of test specifications of long-term pumping test was made based on this study.

JAEA Reports

Study on hydrogeology on the Mizunami Underground Research Laboratory Project annual report for fiscal year 2008

Takeuchi, Ryuji; Saegusa, Hiromitsu; Oyama, Takuya; Keya, Hiromichi; Sato, Atsuya; Kosaka, Hiroshi; Takeda, Masaki; Daimaru, Shuji; Takeuchi, Shinji

JAEA-Research 2010-018, 133 Pages, 2010/08

JAEA-Research-2010-018.pdf:28.5MB

The Mizunami Underground Laboratory Project is a comprehensive research project investigating the deep underground environment within crystalline rock. The project goals of the project from surface-based investigation phase (Phase I) through to operation phase (Phase III) are: to establish techniques for investigation, analysis and assessment of the deep geological environment, and to develop a range of engineering for deep underground application. Currently, the project is under the construction phase (Phase II). One of the Phase II goals, which is for the project goal, was set to develop and revise models of the geological environment using the investigation results obtained during excavation, and determine and assess changes in the geological environment in response to excavation. This document presents the overview of results of the research and development on "hydrogeology" performed in fiscal year 2008, with regard to the Phase II goal.

Journal Articles

Approaches for modelling transient unsaturated-saturated groundwater flow during and after construction

White, M. J.*; Guimer$`a$, J.*; Oyama, Takuya; Kosaka, Hiroshi; Robinson, P.*; Saegusa, Hiromitsu

Proceedings of 12th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM '09/DECOM '09) (CD-ROM), 10 Pages, 2009/10

JAEA has been developing modelling techniques to overcome these problems as part of the Mizunami Underground Research Laboratory. An integrated geological and hydrogeological modelling, and visualization system referred to as GEOMASS has been developed, which allows for transient unsaturated groundwater flow modelling in the presence of dynamic underground excavation models. The flow simulator in GEOMASS, FracAffinity, allows for such modelling by the application of sophisticated gridding techniques, allowing for modification of hydraulic conductivity in key zones, and by suitable modification of water retention models. The approaches that have been developed in GEOMASS have been tested through a series of models of increasing complexity, and the testing has demonstrated that there is no significant impact on estimates of regional groundwater flows or local estimates of flow into underground excavations.

Journal Articles

Numerical assessment of the influence of long-term topographic change on deep groundwater flow conditions

Onoe, Hironori; Sasao, Eiji; Saegusa, Hiromitsu; Kosaka, Hiroshi*

Nippon Genshiryoku Gakkai Wabun Rombunshi, 8(1), p.40 - 53, 2009/03

It is important to understand how long-term geological phenomena influence deep hydrogeological and hydrochemical environments, and to predict influence of long-term geological phenomena in the future for the geological disposal of nuclear wastes. In this study, influence of long-term topographic change on deep groundwater flow conditions was numerically assessed using paleohydrogeological approach. Concretely, paleotopography of wide area was estimated in generalities and groundwater flow simulations were carried out in the Tono area. As a result, it was confirmed that the effects of long-term topography change and hydraulic features of faults on groundwater flow conditions. The methodology in order to understand change of groundwater flow conditions due to long-term topographic change efficiently for identification of detail investigation and assessment area is proposed based on the result of this study.

Journal Articles

"Crystal lattice engineering", an approach to engineer protein crystal contacts by creating intermolecular symmetry; Crystallization and structure determination of a mutant human RNase 1 with a hydrophobic interface of leucines

Yamada, Hidenori*; Tamada, Taro; Kosaka, Megumi*; Miyata, Kohei*; Fujiki, Shinya*; Tano, Masaru*; Moriya, Masayuki*; Yamanishi, Mamoru*; Honjo, Eijiro; Tada, Horiko*; et al.

Protein Science, 16(7), p.1389 - 1397, 2007/07

 Times Cited Count:32 Percentile:42.04(Biochemistry & Molecular Biology)

In an attempt to control protein incorporation in a crystal lattice, a leucine zipper-like hydrophobic interface (comprising four leucine residues) was introduced into a helical region (helix 2) of the human pancreatic ribonuclease 1 (RNase 1) that was predicted to form a suitable crystallization interface. Although crystallization of wild type RNase 1 has not yet been reported, the RNase 1 mutant having four leucines (4L-RNase 1) was successfully crystallized under several different conditions. The crystal structures were subsequently determined by X-ray crystallography by molecular replacement using the structure of bovine RNase A. The overall structure of 4L-RNase 1 is quite similar to that of the bovine RNase A, and the introduced leucine residues formed the designed crystal interface. To further characterize the role of the introduced leucine residues in crystallization of RNase 1, the number of leucines was reduced to three or two (3L- and 2L-RNase 1, respectively). Both mutants crystallized and a similar hydrophobic interface as in 4L-RNase 1 was observed. A related approach to engineer crystal contacts at helix 3 of RNase 1 (N4L-RNase 1) was also evaluated. N4L-RNase 1 also successfully crystallized, and formed the expected hydrophobic packing interface. These results suggest that appropriate introduction of a leucine zipper-like hydrophobic interface can promote intra molecular symmetry for more efficient protein crystallization in crystal lattice engineering efforts.

Journal Articles

Active tectonics of the Senya Hills and evolution of the Senya Active Fault, Eastern margin of the Yokote Basin Fault Zone, Northeast Japan

Kagohara, Kyoko*; Imaizumi, Toshifumi*; Miyauchi, Takahiro*; Sato, Hiroshi*; Uchida, Takuma*; Echigo, Tomoo*; Ishiyama, Tatsuya*; Matsuta, Nobuhisa*; Okada, Shinsuke*; Ikeda, Yasutaka*; et al.

Chigaku Zasshi, 115(6), p.691 - 714, 2006/12

The eastern marginal fault zone of the Yokote Basin is one of seismogenic reverse faults developed in Northeast Japan, generating the 1896 Riku-u Earthquake (M7.2). We discussed the relationship among fault traces, geomorphic displacements and fault geometries on the Senya fault, based on a data from high-resolution seismic reflection profiling, investigations in tectonic geomorphology and structural geology, with the help of the balanced cross section method. By the restoring the balanced cross sections, the horizontal shortening amount is estimated to be totally 3 km through the thrust system, and the thrusting is retroactive to 2.4 Ma. Depending on the strike of fault traces and the morphotectonic features, the Senya fault is subdivided into three, the northern, central and southern portion. The initiation of thrust front migration is ca.1.6 Ma at the central portion and 0.6 Ma at the northern portion. This means that the central portion preceded the northern portion as an emergent fault, and suggests that the initial propagated fault extends from the fault end to the boundary fault.

Oral presentation

A Study of evaluation of influence of long term topographic perturbations on groundwater flow conditions

Saegusa, Hiromitsu; Onoe, Hironori; Kinoshita, Hirohisa*; Sasao, Eiji; Kosaka, Hiroshi*; Tokusu, Mitsuhiro*; Yoden, Toshiaki*

no journal, , 

no abstracts in English

Oral presentation

Hydrogeological Modeling and Groundwater Flow Simulation considering long-term behavior of geological environment

Onoe, Hironori; Saegusa, Hiromitsu; Sasao, Eiji; Kinoshita, Hirohisa*; Kosaka, Hiroshi*

no journal, , 

no abstracts in English

Oral presentation

Hydrogeological study of the Mizunami Underground Research Laboratory project

Keya, Hiromichi; Takeuchi, Ryuji; Toya, Naruhisa; Sato, Atsuya; Saegusa, Hiromitsu; Oyama, Takuya; Kosaka, Hiroshi

no journal, , 

no abstracts in English

Oral presentation

Current status of hydrogeological modeling and groundwater flow simulation on Mizunami Underground Research Laboratory using GEOMASS system

Kosaka, Hiroshi; Saegusa, Hiromitsu; Oyama, Takuya

no journal, , 

no abstracts in English

Oral presentation

On-site/time groundwater flow modeling taking into account excavation of underground facility using GEOMASS system

Kosaka, Hiroshi; Saegusa, Hiromitsu; Oyama, Takuya

no journal, , 

no abstracts in English

Oral presentation

Analysis and hydrogeological modelling on change of groundwater flow and groundwater chemistry with shaft excavation

Oyama, Takuya; Saegusa, Hiromitsu; Mizuno, Takashi; Kosaka, Hiroshi; Hirakawa, Yoshiaki*

no journal, , 

no abstracts in English

Oral presentation

Maintenance of estimate technique for paleo-topography and paleo-climate for the past several hundred thousand years based on data from research and field investigations

Onoe, Hironori*; Shiomi, Tetsuya*; Tokusu, Mitsuhiro*; Hirakawa, Yoshiaki*; Kusano, Tomohiro; Yasue, Kenichi; Kosaka, Hiroshi; Saegusa, Hiromitsu; Takeuchi, Ryuji; Nohara, Tsuyoshi; et al.

no journal, , 

no abstracts in English

28 (Records 1-20 displayed on this page)