Combining structural and hydrogeological data: Conceptualization of a fracture system

In this paper a fracture system is studied based on hydrogeological observations and structural measurements at different scales from the Bلtaapلti site, which has been chosen to store Hungaryʹs low- and medium-level nuclear waste. It is argued that the combination of these two approaches may improve our understanding of the structure of the fracture system at different scales. aper presents the orientations, sizes, intensity, spatial locations and transmissivity of fractures at different scales in two hydraulic domains: 1) more transmissive zones, and 2) less transmissive blocks. Based on the evaluation of these properties, a conceptual model has been developed for the fracture system. The hydrostructural concept suggests that the complexity of fracture orientation and intensity increases with distance from more transmissive zones to less transmissive blocks but fracture size and transmissivity decrease. It also suggests that these parameters vary continuously between different hydraulic domains and that different parameters are strongly intercorrelated. mplex interpretation of the fracture system studied can provide direct inputs for hydrogeological models, but can also provide conceptual information for the development of the geosphere module in safety calculations.