Study of hydrogeology in the 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 (FY 2009)

Shimo, Michito*; Kumamoto, So*; Tsuyuguchi, Koji; Onoe, Hironori; Saegusa, Hiromitsu; Mizuno, Takashi; Oyama, Takuya

JAEA-Research 2012-043, 98 Pages, 2013/03

JAEA-Research-2012-043.pdf:26.71MB

One of the goals of the Mizunami Underground Research Laboratory (MIU) Project is to develop technical basis for investigation, analysis and evaluation technologies for understanding the 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 hydrogeological model and groundwater flow simulation technique, have to be established. As a result of this study, the significant hydrogeological structures around the MIU Construction Site were estimated. The inflow rate into the MIU facilities and hydraulic and geochemical impacts around the MIU Construction Site caused by the MIU facilities construction were predicted. The effect of pre-grouting to the MIU facilities was also confirmed.

Fault-related features and restoration of fault slips revealed by airborne laser imagery along the Senya fault and Adera fault

Nakata, Takashi*; Kumamoto, Takashi*; Okumura, Koji*; Goto, Hideaki*; Kumahara, Yasuhiro*; Nohara, Tsuyoshi; Sato, Masaru*; Iwanaga, Shoji*

Katsudanso Kenkyu, (29), p.1 - 13, 2008/09

http://ci.nii.ac.jp/naid/130003355435

Laser imagery technique is applied to obtain comprehensive features of typical reverse fault (Senya fault in NE Japan) and strike-slip fault (Adera fault in Central Japan). We test several methods for obtaining fault slip from detailed DEM images. Using the visual analyzer "Geo-Graphia", several three-dimensional laser imageries are processed around Senya hill, especially along the surface fault ruptures associated with 1896 Rikuu earthquake. We compared amount of fault slips along the fault ruptures measured by field work (Matsuda et al., 1980) with that obtained by automatic and manual profiling using detailed DEM. Three-dimensional laser imageries are also processed along Adera fault, and slip vectors are restored based on successively faulted terrace risers around Sakashita town.