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JAEA Reports

Theoretical background and user's manual for the computer code on groundwater flow and radionuclide transport calculation in porous rock

*;

JNC-TN8400 2001-027, 131 Pages, 2001/11

JNC-TN8400-2001-027.pdf:0.8MB

In order to document a basic manual about input data, output data, execution of computer code on groundwater flow and radionuclide transport calculation in heterogeneous porous rock, we investigated the theoretical background about geostastical computer codes and the user's manual for the computer code on groundwater flow and radionuclide transport which calculates water flow in three dimension, the path of moving radionuclide, and one dimensional radionuclide migration. In this report, based on above investigation we describe the geostastical background about simulating heterogeneous permeability field. And we describe construction of files, input and output data, a example of calculating of the programs which simulates heterogeneous permeability field, and calculates groundwater flow and radionuclide transport. Therefore, we can document a manual by investigating the theoretical background about geostastical computer codes and the user's manual for the computer code on groundwater flow and radionuclide transport calculation. And we can model heterogeneous porous rock and analyze groundwater flow and radionuclide transport by utilizing the information from this report.

JAEA Reports

None

Yoshikawa, Hideki; Ishikawa, Hirohisa;

JNC-TN8200 2001-004, 160 Pages, 2001/06

JNC-TN8200-2001-004.pdf:129.13MB

None

JAEA Reports

The data analysis of the single well injection-withdraw tracer experiment using the MACRO II

*; *;

JNC-TN8400 2001-012, 69 Pages, 2001/04

JNC-TN8400-2001-012.pdf:8.43MB

On understanding the radionuclide transport in natural barrier in radioactive waste isolation research, the macroscopic dispersion in heterogeneous permeability field in the underground rock is regarded as an important process. Therefore, we have conducted lots of tracer experiments by the MACRO II facility with an artificially constructed heterogeneous permeability field. In order to study the scale dependence of dispersion coefficients in case of laboratory experiments, we placed the flow cell horizontally, and conducted injection-withdraw tracer experiment with a single well. We have conducted I5 cases experiments. These cases were prepared by changing a position of single well and the injection-withdraw time. At each position we have conducted 9 cases and 6 cases experiments. In this report, we evaluated the macroscopic dispersion coefficients by the fitting of analytical solution to breakthrough curve measured by the 15 cases pumping tracer experiment. Consequently, we could evaluate the dispersion coefficients for 12 cases of 15 cases. Then, we discussed the relation between a injection-withdraw flow rate and a property of heterogeneous media and dispersion coefficient. The conclusions obtained from the results of the evaluation are summarized as follows, (1)It was found that the macroscopic dispersion coefficients tend to be increased with increase of the average radius of tracer front spread around a single well. (2)We have conducted any experiments with s single well settled at two positions. In case of that there is low permeability around a single well, we found dispersion coefficients are large. In case of that there is high permeability around a single well, we found dispersion coefficients are small. (3)In three cases that we could not evaluate because of incorrect accuracy of fitting, we have found it possible that there is some points that dispersion coefficients were strikingly small in tracer front.

JAEA Reports

Reliability evaluation of simulation models for nearfield groundwater flow and radionuclide transport computation

*; *; *; *

JNC-TJ8400 2000-006, 232 Pages, 2000/05

JNC-TJ8400-2000-006.pdf:7.75MB

In this research, simulations with some parameters which characterize ground water flow and the reliability evaluation for the expansion of the calculation method of groundwater flow were carried out by using the radionuclide transport computations in nearfield heterogeneous porous media. Concretely contents are follows: (1)With the series of calculation method for three-dimensional saturated/unsaturated groundwater flow and one-dimensional radionuclide transport. the computational analyses with the parameters used in JNC report in 2000 was carried out and the influence of the different input flux was evaluated. (2)The examination of the application for the different ways of inverse laplace transformation which is used in one-dimensional radionuclide tansport analysis code "MATRICS" was carried out. (3)The examination of the application of multi-element "MATRICS" (m-MATRICS) for radionuclide transport computations in nearfield heterogeneous porous media was carried out. (4)The series of calculation methods from three-dimensional saturated/unsaturated ground water flow simulation code to one-dimensional radionuclide transport simulation code was integrated.

JAEA Reports

Reliability evaluation of simulation models for nearfield groundwater flow and radionuclide transport computation

*; *; *; *

JNC-TJ8400 2000-005, 71 Pages, 2000/05

JNC-TJ8400-2000-005.pdf:4.0MB

In this research, simulations with some parameters which characterize ground water flow and the reliability evaluation for the expansion of the calculation method of groundwater flow were carried out by using the radionuclide transport computations in nearfield heterogeneous porous media. Concretely contents are follows: (1)With the series of calculation method for three-dimensional saturated/unsaturated groundwater flow and one-dimensional radionuclide transport, the computational analyses with the parameters used in JNC report in 2000 was carried out and the influence of the different input flux was evaluated. (2)The examination of the application for the different ways of inverse laplace transformation which is used in one-dimensional radionuclide transport analysis code "MATRICS" was carried out. (3)The examination of the application of multi-element "MATRICS" (m-MATRICS) for radionuclide transport computations in nearfield heterogeneous porous media was carried out. (4)The series of calculation methods from three-dimensional saturated/unsaturated ground water flow simulation code to one-dimensional radionuclide transport simulation code was integrated.

JAEA Reports

None

*; ;

JNC-TJ7440 99-031, 22 Pages, 1999/09

JNC-TJ7440-99-031.pdf:6.36MB

no abstracts in English

JAEA Reports

None

Horita, M.*; Hokari, T.*

JNC-TJ7440 99-022, 378 Pages, 1999/06

JNC-TJ7440-99-022.pdf:14.69MB

no abstracts in English

JAEA Reports

None

*; *; *; *

JNC-TJ7440 99-016, 120 Pages, 1999/03

JNC-TJ7440-99-016.pdf:0.74MB

no abstracts in English

JAEA Reports

None

*

JNC-TJ1400 99-016, 24 Pages, 1999/02

JNC-TJ1400-99-016.pdf:0.86MB

no abstracts in English

JAEA Reports

None

*; *; *; *

JNC-TJ7440 99-001, 151 Pages, 1999/01

JNC-TJ7440-99-001.pdf:10.35MB

no abstracts in English

JAEA Reports

None

Shimo, Michito*; Yamamoto, Hajime*; *; Doe, T.*

PNC-TJ1205 98-001, 255 Pages, 1998/03

PNC-TJ1205-98-001.pdf:8.45MB

None

JAEA Reports

None

Shimo, Michito*; Yamamoto, Hajime*; *; *; Doe, T.*

PNC-TJ1205 97-001, 297 Pages, 1997/03

PNC-TJ1205-97-001.pdf:10.02MB

None

JAEA Reports

None

Shimo, Michito*; Yamamoto, Hajime*; *; Negi, Tateyuki*; Doe, T.*

PNC-TJ1205 96-003, 340 Pages, 1996/03

PNC-TJ1205-96-003.pdf:8.4MB

None

JAEA Reports

Groundwater flow analyses in Japan; part 3 : A Case study in Hokkaido

; ; Koide, Kaoru; Yanagizawa, Koichi

PNC-TN7410 95-012, 65 Pages, 1995/05

PNC-TN7410-95-012.pdf:1.71MB

An extensive study program has been carried out by PNC to estimate hydrogeological characteristics of deep underground in Japan. As a part of this program, groundwater flow analyses in Hokkaido were conducted. For the analyses of Hokkaido area (500 km $$times$$ 400 km $$times$$ 10 km deep), a hydrogeological model representing topography, distribution of hydraulic conductivity was developed on the strength of information available from open literature. By the use of this model, steady state three-dimensional groundwater flow under a saturated-unsaturated condition was calculated by means of finite element method. The results are as follows : (1)Distribution of piezometric head corresponds with topography in the study area. (2)Piezometric head distribution is hydrostatic below E.L.-1000 m in the study area. (3)Hydraulic gradient in the study area is less than 0.04 below E.L. -500 m. (4)Difference of boundary conditions at the shore side this model does not affect the result of the analyses.

JAEA Reports

None

Shimo, Michito*; *; Thomas*

PNC-TJ1205 95-004, 170 Pages, 1995/05

PNC-TJ1205-95-004.pdf:9.76MB

None

JAEA Reports

None

PNC-TJ1281 95-002, 257 Pages, 1995/02

PNC-TJ1281-95-002.pdf:27.26MB

None

JAEA Reports

Groundwater flow analyses in Japan; Part2: A Case study in northeast Japan

; ; Koide, Kaoru; Imai, Hisashi*; Yanagizawa, Koichi

PNC-TN7410 94-029, 60 Pages, 1994/05

PNC-TN7410-94-029.pdf:1.75MB

An extensive study program has been carried out by PNC to estimate hydrogeological characteristics of deep underground in Japan. As a part of this program, groundwater flow analyses in Northeast Japan were conducted. For the analyses of Northeast Japan area (300 $$times$$ 500km $$times$$ 10 km deep), a hydrogeological model expressing topography, distribution of hydraulic conductivity was developed with information available from open literature. By the use of this model, steady state three-dimensional groundwater flow under a saturated-unsaturated condition was calculated by means of finite element method. The results are as follows : (1)Distribution of piezometric head corresponds with topography in the study area. (2)Piezometric head distribution is hydrostatic below E,L. -1000 m in thc study area. (3)Hydraulic gradient in the study area is less than 0.04 below E.L. -500 m. (4)Analytical seepage points appear in principal catchment areas. (5)Difference of boundary conditions such as permeable or impermeable at the shore side of this model does not affect the results of the analyses. (6)In case of setting higher hydraulic conductivity to Holocene and Pleistocene scdimentary rocks than that to Pliocene sedimentary rocks, the results of the analysis are as same as the inverse case while discharge rate decreases.

JAEA Reports

None

PNC-TJ1222 94-001, 357 Pages, 1994/03

PNC-TJ1222-94-001.pdf:8.34MB

None

JAEA Reports

None

*; Horita, M.*; Ishii, T.*; Yamamoto, Isamu*; Horie, Y.*; Hokari, T.*; *

PNC-TJ1060 92-006, 128 Pages, 1992/11

PNC-TJ1060-92-006.pdf:9.43MB

None

JAEA Reports

Fracture analysis in crystalline rock with method of multivariate analysis

Ogata, Nobuhisa; Osawa, Hideaki; ; Yanagizawa, Koichi

PNC-TN7410 92-001, 48 Pages, 1992/01

PNC-TN7410-92-001.pdf:1.71MB

In order to groundwater flow in rock formation, it is essential to make a topographic and hydrogeological models and to set up the initial and boundary conditions. Hydraulic properties are considered to be dominated by various factors of fracture (i.e. width, density, network) in the crystalline rock. Investigated was relationship between the hydraulic conductivity. which is one of important factors for evaluation of groundwater flow, and the fracture properties, using the method of multivariate analysis such as multiple regression analysis and cluster analysis. A total of 56 data on hydraulic conductivity and physical parameter were used that had been obtained from 2 boreholes drilled in the granitic rock of Tono area, Gifu, in the central Japan. The results are as follows: (1)The results of these two multivariate analysis are almost consistent. The hydraulic conductivity in the granitic rock is dominated by fracture system, such as number and width of the fracture, fissure-filling minerals. (2)The classificatory structure which obtained from the cluster analysis corresponds to that from hydraulic conductivity. Different hydraulic conductivities were distributed in each cluster that is dominated by width of open fracture, filling minerals, number of intersect and predominant direction of fractures. (3)The cluster analysis also implies that fracture properties of test sections with the similar hydraulic conductivities occasionally differ among them. Hence, the classifications is must be made based on the data of fracture properties as well as hydraulic conductivities. Future studies using sufficient number of data is necessary.

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