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White, M. J.*; Guimer
, 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.
Guimer, J.*; Saegusa, Hiromitsu; Onoe, Hironori; Oyama, Takuya; White, M. J.*; Robinson, P.*
Proceedings of 36th International Association of Hydrogeologists Congress 2008 (IAH 2008) (CD-ROM), 10 Pages, 2008/10
Oyama, Takuya; Saegusa, Hiromitsu; Onoe, Hironori; Guimer, J.*; White, M. J.*; Robinson, P.*
Proceedings of 36th International Association of Hydrogeologists Congress 2008 (IAH 2008) (CD-ROM), 10 Pages, 2008/10
Guimer, J.*; Ruiz, E.*; Luna, M.*; Arcos, D.*; Dom
nech, C.*; Jordana, S.*; Saegusa, Hiromitsu; Iwatsuki, Teruki
Proceedings of 11th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM '07) (CD-ROM), 8 Pages, 2007/00
Many possible origins have been proposed for the saline groundwater observed in granite show total dissolved solids increasing to 50 mmol/L at depths below 800 m. Different hypothesis have been formulated to explain the observed fluid composition, among them, long-term water-rock interaction, mixing with residual fluids of magmatic origin and relict seawater dating from Miocene times. A review of the hydrochemical and isotopic data suggest that the three above hypotheses may be valid, at least to different degrees, or that processes acting over more recent geological times may be involved. The origin of the salinity was assessed by simulating land emersion by means of changing the upper recharge boundary. In this manner the Miocene seawater was modelled as being continually mixed with fresh water until the present time. The effects of different retardation processes were considered by varying factors such as matrix diffusion and fracture conductivity. Finally, geochemical reactions reproduced trends in major ions and master variables.
Saegusa, Hiromitsu; White, M. J.*; Robinson, P.*; Guimer, J.*
Proceedings of 11th International High-Level Radioactive Waste Management Conference (IHLRWM) (CD-ROM), p.330 - 337, 2006/00
no abstracts in English
Saegusa, Hiromitsu; White, M. J.*; Robinson, P.*; Guimer, J.*
Proceedings of 11th International High-Level Radioactive Waste Management Conference (IHLRWM) (CD-ROM), p.330 - 337, 2006/00
no abstracts in English
