Application of Indicator Geostatistics to the Gorleben Data Set

by J. D. Porter, Windscale Lab, United Kingdom,

Document Type: Proceeding Paper

Part of: High Level Radioactive Waste Management 1993


This paper describes a trial application of Indicator geostatistical methods to borehole data from the Gorleben site. Indicator variograms have been estimated from the site data and fitted to theoretical models. Indicator Kriging calculations have been carried out for a region between two boreholes, and for planes lying across and along the Gorleben erosion channel. The results of Indicator Kriging share some features with the suggested geological interpretation supplied with the data, but also show some potentially significant differences, particularly in the continuity of the clay layers. The sensitivity of the Kriged fields to various parameter choices has been investigated, as has the distribution of the Kriging variance. Consideration is now being given to possible sources of the observed discrepancies and thus to making greater use of stratigraphic information in the analysis of the data.

Subject Headings: Statistics | Geology | Kriging | Boring | Field tests | Data analysis | Radioactive wastes | Groundwater flow

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