Technischer Bericht NTB 83-04

The main objective of the research contract of the department of Low Level Counting and nuclear geophysics of the University of Bern with the Nagra (Swiss National Cooperative for the storage of nuclear wastes) is to get informations about groundwater flow in geological formations by the development and application of isotopic methods. By the use of these methods it is possible to get informations about origin, flow paths and residence times of groundwater. Such informations, combined with the results of hydrogeochemical and hydrogeological investigations can be used to get a synthetic picture of the groundwater processes, especially when further combined with hydrodynamic model calculations.

The synthesis of the integrated study which includes isotopic and art and the concept of application of the isoregional outflow points and the deep drilled wells) together with the results of hydrodynamic simulation models is intended to be used by the Nagra to evaluate the properties and the suitability of geological formations with respect to the construction of a final repository for high level nuclear wastes in the granitic basement.

This first report will present an overview of the general state of the art and the concept of application of the isotope methods in hydrology.

In order to summarize, a short introduction on methods, informations to be gained and possibilities of interpretation is given in the following outline.

Komplette Zusammenfassung / Résumé complet / Full abstract: NTB 83-04 Zusammenfassung – Résumé – Summary.pdf