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Three-dimensional analysis of groundwater flow in neogene rocks at the Rokkasho low-level radioactive waste disposal center, Japan |
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| Authors: | Tai Sasaki Naro Hashimoto Takayuki Nakato Tomonari Shiraishi Kazuaki Yajima Tomoyuki Hishiya |
| Institution: | aJapan Nuclear Fuel, Ltd, Civil and Architectural Engineering Department, Uchisaiwai, Chiyoda, Fukoku seimei Bld. 2-2-2, Tokyo 100,Japan bMitsubishi Materials Corporation, 1-3-25, Koishikawa Bunkyo, Tokyo 112,Japan cShimizu Corporation, 1-2-3, Shibaura, Minato, Tokyo 105-07,Japan dDia Consultants Co., Ltd., 2-272-3, Yoshino, Oomiya, Saitama 330,Japan |
| Abstract: | As a preliminary step for predicting groundwater flow in a plateau 30–50 m above sea level, a model for three-dimensional analysis of groundwater flow was formulated and its validity was verified. The plateau consists of Neogene sedimentary rocks and a Quaternary deposit. Most of the groundwater originates in precipitation, with the groundwater table lying in the Quaternary deposit. Steady-state analysis was conducted by using the finite element method. The results of pore-water pressure measurement and water examination were useful in verifying the validity of the model. In constructing the model, reducing the hydraulic conductivity according to the depth on the basis of the results of the actual measurement was important. |
| Keywords: | Groundwater flow analysis Hydraulic conductivity Water quality |
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