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A simple transport model for the Grimsel migration experiments

Technical Report:

Abstract

To understand the results of the field migration experiments of NAGRA at the Grimsel Test Site (Central Switzerland), it is necessary to develop models (hydraulic as well as transport models). In this paper a simple approach with streamtubes is described which allows to model the hydraulic situation for asymmetric dipole arrangements and transport along streamlines, including sorption and diffusion into fracture infill material. The model is confronted with two experiments, one with a nonsorbing tracer (uranine) and the other with sorbing ({sup 24}Na) and nonsorbing tracer material. The fit-by-eye parameter values are compatible with those from batch experiments. The sensitivity of breakthrough curves on the chosen parameters was checked with a parameter variation study. In the range of considered variations the breakthrough curves of non-sorbing tracers are not sensitive to matrix properties because saturation is achieved in all cases considered. For sorbing tracers the situation is more complicated as saturation may be achieved or not within the experimental timescale; due to this fact, it is emphasized, that step input experiments should be performed instead of pulse test experiments. (author) 17 figs., 4 tabs., 10 refs.
Authors:
Herzog, F [1] 
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Publication Date:
Sep 01, 1991
Product Type:
Technical Report
Report Number:
PSI-106
Reference Number:
SCA: 540230; 052002; PA: AIX-23:010946; SN: 92000637693
Resource Relation:
Other Information: PBD: Sep 1991
Subject:
54 ENVIRONMENTAL SCIENCES; 12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; GRANITES; RADIONUCLIDE MIGRATION; MATHEMATICAL MODELS; CHEMISORPTION; EXPERIMENTAL DATA; GEOLOGIC FRACTURES; HYDRAULIC CONDUCTIVITY; RADIOACTIVE WASTE DISPOSAL; SODIUM 24; SWITZERLAND; THEORETICAL DATA; TRACER TECHNIQUES; UNDERGROUND DISPOSAL; 540230; 052002; RADIOACTIVE MATERIALS MONITORING AND TRANSPORT; WASTE DISPOSAL AND STORAGE
OSTI ID:
10111337
Research Organizations:
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Other: ON: DE92613461; TRN: CH9100670010946
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
CHN
Size:
58 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Herzog, F. A simple transport model for the Grimsel migration experiments. Switzerland: N. p., 1991. Web.
Herzog, F. A simple transport model for the Grimsel migration experiments. Switzerland.
Herzog, F. 1991. "A simple transport model for the Grimsel migration experiments." Switzerland.
@misc{etde_10111337,
title = {A simple transport model for the Grimsel migration experiments}
author = {Herzog, F}
abstractNote = {To understand the results of the field migration experiments of NAGRA at the Grimsel Test Site (Central Switzerland), it is necessary to develop models (hydraulic as well as transport models). In this paper a simple approach with streamtubes is described which allows to model the hydraulic situation for asymmetric dipole arrangements and transport along streamlines, including sorption and diffusion into fracture infill material. The model is confronted with two experiments, one with a nonsorbing tracer (uranine) and the other with sorbing ({sup 24}Na) and nonsorbing tracer material. The fit-by-eye parameter values are compatible with those from batch experiments. The sensitivity of breakthrough curves on the chosen parameters was checked with a parameter variation study. In the range of considered variations the breakthrough curves of non-sorbing tracers are not sensitive to matrix properties because saturation is achieved in all cases considered. For sorbing tracers the situation is more complicated as saturation may be achieved or not within the experimental timescale; due to this fact, it is emphasized, that step input experiments should be performed instead of pulse test experiments. (author) 17 figs., 4 tabs., 10 refs.}
place = {Switzerland}
year = {1991}
month = {Sep}
}