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Hasegawa, Ken; Yamada, Nobuto; Endo, Yoshinobu*; Koide, Kaoru
JAEA-Research 2013-028, 83 Pages, 2013/12
JAEA-Research-2013-028.pdf:18.29MB
To evaluate the applicability of the airborne geophysical methods to granitic area, Tono Geoscience Center conducted the airborne geophysical survey using helicopter in the region of the Toki granite from 1997 to 1999. Data of electromagnetic survey, magnetic survey and radiometric survey were collected. This time, we re-interpreted these data. The following is the summary of the results obtained. (1) Electromagnetic survey; We developed the new calculation method and the data was reprocessed. As a result, it made us possible to obtain the apparent resistivity value corresponding to the rock resistivity. And the new apparent resistivity contour map clearly shows the depth changes of the granitic rock. (2) Magnetic survey; Magnetic susceptibility of the target granite is not uniform. From the viewpoint of magnetic susceptibility, the granite is divided into about five parts using a color shaded relief map. This map is a very useful tool for a qualitative interpretation of magnetic data. (3) Radiometric Survey; Some local anomalies were obtained. It is inferred that they correspond with the autocrops of the granitic rocks or the uranium deposits, not with the open fractures. These results indicate that an airborne geophysical survey using helicopter provides the useful information for planning of the geological and geophysical ground surveys.
Onoe, Hironori; Saegusa, Hiromitsu; Oyama, Takuya; Endo, Yoshinobu*
JAEA-Research 2007-034, 106 Pages, 2007/03
JAEA-Research-2007-034.pdf:32.86MB
One of the main goals of the Mizunami Underground Research Laboratory Project is to establish comprehensive techniques for investigation, analysis, and assessment of the deep geological environment. To achieve this goal, a variety of investigations are being conducted using an iterative approach. In this study, hydrogeological modeling and groundwater flow analyses have been carried out using the data from surface-based investigation (Phase I) at the Step 4, in order to synthesize the investigation results, to evaluate the uncertainty of the groundwater flow system, and to specify items for Construction (Phase II). As a result of the study, it could be confirmed the uncertainty of groundwater flow system was decreased as stepwise investigation in Phase I. To characterize groundwater flow system, it could be understood that field investigation, hydrogeological modeling and groundwater flow simulation iteratively is most efficiently. Also, it could be learned techniques to decrease the uncertainty efficiently. The main items specified for Phase II investigation are summarized as follows: (1) Execution of monitor to understand change of groundwater flow system according to excavation of the shafts and research galleries; (2) Modification of hydrogeological model of Phase1.
Onoe, Hironori; Saegusa, Hiromitsu; Endo, Yoshinobu*
JNC TN7400 2005-012, 76 Pages, 2005/07
JNC-TN7400-2005-012.pdf:2.39MB
One of the main goals of the Mizunami Underground Research Laboratory Project is to establish comprehensive techniques for investigation, analysis, and assessment of the deep geological environment. To achieve this goal, a variety of investigations are being conducted using an iterative approach.In this study, hydrogeological modeling and groundwater flow analyses have been carried out using the data from surface-based investigations at former stage of Step 3 (deep borehole investigations without reflection seismic survey and vertical seismic profiling investigations), in order to synthesize the investigation results, to evaluate the uncertainty of the hydrogeological model, and to specify items for further investigation.The results of this study are summarized as follows :1) The uncertainty of hydrogeological model of the site scale is decreased as stepwise research;2) Borehole investigations combined with hydraulic monitoring are useful for decreasing the uncertainty of hydrogeological model;The main items specified for further investigations are summarized as follows :1) Trend, length, and hydraulic parameters of faults confirmed in the MIU construction site;2) Shape of boundary of geological layer, and hydraulic parameters of rock;3) Hydraulic head distribution of deep underground.
Oyama, Takuya; Saegusa, Hiromitsu; Onoe, Hironori; Endo, Yoshinobu*
JNC TN7400 2005-008, 77 Pages, 2005/05
JNC-TN7400-2005-008.pdf:2.65MB
One of the main goals of the Mizunami Underground Research Laboratory Project is to establish comprehensive techniques for investigation, analysis, and assessment of the deep geological environment. To achieve this goal, a variety of investigations are being conducted using an iterative approach.In this study, hydrogeological modeling and groundwater flow analyses have been carried out using the data from surface-based investigations at Step 0 and 1, in order to synthesize the investigation results, to evaluate the uncertainty of the hydrogeological model, and to specify items for further investigation.The results of this study are summarized as follows:1) The understanding of groundwater flow was enhanced from Step0 to Step1, and the hydrogeological model could be revised;2) The importance of faults as major groundwater flow pathways was demonstrated;3) Geological and hydraulic characteristics of faults with orientation of NNW and NW were shown to be especially significant;The main item specified for further investigations is summarized as follows: Geological and hydraulic characteristics of NNW and NE trending faults.
Matsuoka, Toshiyuki; Kumazaki, Naoki*; Saegusa, Hiromitsu; Sasaki, Keiichi; Endo, Yoshinobu*; Amano, Kenji
JNC TN7400 2005-007, 99 Pages, 2005/03
JNC-TN7400-2005-007.pdf:4.93MB
One of the main goals of the Mizunami Underground Research Laboratory (MIU) Project is to establish appropriate methodologies for reliably investigating and assessing the deep subsurface. This report documents the results of geological modeling of Step1 and Step2 using the iterative investigation approach at the site-scale (several 100m to several km in area). For the Step1 model, existing information (e.g. literature), and results from geological mapping and reflection seismic survey were used. For the Step2 model, additional information obtained from the geological investigation using existing borehole and the shallow borehole investigation were incorporated. As a result of this study, geological elements that should be represented in the model were defined, and several major faults with trends of NNW, EW and NE trend were identified (or inferred) in the vicinity of the MIU-site.
Onoe, Hironori; Saegusa, Hiromitsu; Endo, Yoshinobu*
JNC TN7400 2005-006, 93 Pages, 2005/02
JNC-TN7400-2005-006.pdf:2.35MB
One of the main goals of the Mizunami Underground Research Laboratory Project is to establish comprehensive techniques for investigation, analysis, and assessment of the deep geological environment. To achieve this goal, a variety of investigations are being conducted using an iterative approach.In this study, hydrogeological modeling and groundwater flow analyses have been carried out using the data from field-based investigations at Step 2, in order to synthesize the investigation results, to evaluate the uncertainty of the hydrogeological model, and to specify items for further investigation.
Oyama, Takuya; Onoe, Hironori; Saegusa, Hiromitsu; Endo, Yoshinobu*
no journal, ,
no abstracts in English