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JAEA Reports

Study on development of evaluation technique of in-situ tracer test in Horonobe Underground Research Laboratory Project (Contract research)

Yokota, Hideharu; Amano, Kenji; Maekawa, Keisuke; Kunimaru, Takanori; Naemura, Yumi*; Ijiri, Yuji*; Motoshima, Takayuki*; Suzuki, Shunichi*; Teshima, Kazufumi*

JAEA-Research 2013-002, 281 Pages, 2013/06

JAEA-Research-2013-002.pdf:13.03MB

To evaluate permeable heterogeneity in a fracture and scale effects which are problems to be solved based on the ${it in-situ}$ mass transportation data of fractures in hostrock, a number of tracer tests are simulated in a fictitious single plate fracture generated on computer in this study. And the transport parameters, e.g. longitudinal dispersion length, true velocity and dilution rate, are identified by fitting one- and two-dimensional models to the breakthrough curves obtained from the simulations in order to investigate the applicability of these models to the evaluation of ${it in-situ}$ tracer test. As a result, one-dimensional model yields larger longitudinal dispersion length than two-dimensional model in the both cases of homogeneous and heterogeneous hydraulic conductivity fields of the fictitious fracture. And, the longitudinal dispersion length identified from a tracer test is smaller and/or larger than the macroscopic longitudinal dispersion length identified from whole fracture. It is clarified that these are occurred by shorter or longer distance between boreholes compare to the correlation length of geostatistical heterogeneity of fictitious fracture.

Oral presentation

A Study on the applicability of one-dimensional model for evaluating in-situ tracer tests in a fracture

Naemura, Yumi*; Ijiri, Yuji*; Sawada, Atsushi; Kunimaru, Takanori; Ota, Kunio

no journal, , 

The applicability of one-dimensional model for evaluating in-situ tracer tests in a two-dimensional flow within a fracture was examined by comparing with the result of one- and two-dimensional model.

Oral presentation

A Study on the applicability of one-dimensional model for evaluating in-situ tracer tests in a fracture, 3

Naemura, Yumi*; Ijiri, Yuji*; Amano, Kenji; Yokota, Hideharu; Maekawa, Keisuke; Sawada, Atsushi

no journal, , 

no abstracts in English

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