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| Titel |
Development of a Hydrogeological Model of the Borrowdale Volcanics at Sellafield |
| VerfasserIn |
R. J. Lunn, A. D. Lunn, R. Mackay |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 1, no. 1 ; Nr. 1, no. 1, S.35-46 |
| Datensatznummer |
250000081
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| Publikation (Nr.) |
 copernicus.org/hess-1-35-1997.pdf |
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| Zusammenfassung |
This work has arisen out of recent developments within
the radioactive waste research programme managed by Her Majesty's Inspectorate
of Pollution, UK (HMIP)*, to develop an integrated flow and transport model
for the potential deep radioactive waste repository at Sellafield. One
of the largest sources of uncertainty in model predictions, is the characterisation
of the hydrogeological properties of the underlying strata, in particular,
of the Borrowdale Volcanic Group (BVG) within which the repository is to
be located. Analysis of the available borehole data (that released by the
proponent company, Nirex, by December 1995) for the BVG formation has indicated
a dual regime consisting of flow within faults and flow within the matrix
(or an equivalent porous medium containing micro-fractures). Significant
relationships between permeability, depth and the presence and orientation
of faults have been identified; they account for a variation of up to 6
orders of magnitude in mean permeability measurements. This can be explained
in part by the effect of the orientation of the current maximum principal
stress directions within the BVG: however, it is likely that permeability
is also dependent on the existence of fracture families, which cannot be
effectively identified from the data currently available.
These analyses
have enabled considerable insight to be gained into the dominant features
of flow within the BVG. The conceptual hydrogeological model derived here
will have a significant effect on the outcome and reliability of future
radionuclide transport predictions in the Sellafield area. |
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