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Doughty, C.*; Tsang, C.-F.*; Yabuuchi, Satoshi; Kunimaru, Takanori
Journal of Hydrology, 482, p.1 - 13, 2013/03
Times Cited Count：16 Percentile：51.79(Medical Informatics)To improve the field method to provide heterogenety data for modeling of solute transport in complex fractured rock, the analysis of the flowing fluid electric conductivity(FFEC) logging was examined. FFEC logging was conducted in the pilot borehole in fractured sedimentary rock in Japan as part of the Horonobe Underground Research Laboratory Project. FFEC logs were collected under unpumped conditions and at two different pumping rates, nominally 8L/min and 16L/min. Though the data have a number of complications, the analysis was successful to identify 17 hydraulically conducting fractures, and to estimate their hydraulic transimissivities, inherent pressure heads and salinities (in terms of fluid electric conductivities). The results are confirmed in comparison with hydraulic packer tests and hydrochemical data.
Ijiri, Yuji*; Saegusa, Hiromitsu; Sawada, Atsushi; Ono, Makoto*; Watanabe, Kunio*; Karasaki, Kenji*; Doughty, C.*; Shimo, Michito*; Fumimura, Kenichi*
Journal of Contaminant Hydrology, 103(3-4), p.168 - 181, 2009/01
Times Cited Count：9 Percentile：30.23(Environmental Sciences)Qualitative evaluation of the effects of uncertainties originating from scenario development, conceptual models, and parameter values is an important subject in the area of safety assessment for high-level nuclear waste disposal. In this study, regional-scale groundwater flow analyses for the Tono area, Japan were conducted using three continuous models which were designed to handle heterogeneous porous media. We evaluated the simulation results to quantitatively analyze uncertainties originating from conceptual models. We found that uncertainties originating from conceptual models (1) greatly depend on boundary conditions and hydrological structures to be modeled, which are assigned by modelers, and (2) are larger than uncertainties originating from the variance in realizations of the Monte Carlo method in stochastic modeling.
Doughty, C.*; Tsang, C.-F.*; Hatanaka, Koichiro; Yabuuchi, Satoshi; Kurikami, Hiroshi
Water Resources Research, 44(8), p.W08403_1 - W08403_11, 2008/08
Times Cited Count：17 Percentile：44.06(Environmental Sciences)The flowing fluid electric conductivity (FFEC) logging method is an efficient way to provide information on the depths, salinities, and inflow strengths of individual conductive features intercepted by a borehole, without the use of specialized probes. The present paper presents the application of the method to two zones within a 1000-m borehole in sedimentary rock, which produced, for each zone, three sets of logs at different pumping rates, each set measured over a period of about one day.
Tsang, C.-F.*; Doughty, C.*; Uchida, Masahiro
Water Resources Research, 44(8), p.W08445_1 - W08445_13, 2008/08
Times Cited Count：7 Percentile：22.21(Environmental Sciences)no abstracts in English
