Role of Fracture Zones in Controlling Hydraulic Head and Groundwater Flow—Experience from Site Characterization Program in Finland

by Henry Ahokas,
Fintact Ky,



Document Type: Proceeding Paper

Part of: High Level Radioactive Waste Management 1993

Abstract: The preliminary site investigations for the final disposal of HLW produced by TVO have been carried out during 1987 - 1992 in five areas. All the areas consist of Precambrian crystalline bedrock. The aim of these studies has been to identify and characterize geological structures, especially fractures and fracture zones with high hydraulic conductivity in order to study groundwater flow phenomena. Measured values of hydraulic head in packed-off sections of the boreholes have produced valuable information about the existence of hydraulically conductive fracture zones and their effects on spatial changes in hydraulic head and groundwater flow. The aim of this paper is to present qualitatively, without numerical simulations, how some main fracture zones control hydraulic head and groundwater flow in Romuvaara investigation area in Kuhmo, Finland.

Subject Headings: Hydraulic fracturing | Groundwater flow | Head (fluid mechanics) | Geology | Hydraulic structures | Flow simulation | Site investigation | Flow measurement | Finland | Europe

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