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In the present w ork some num erical approaches are tested in order to comprehensively characterise the multi-scale geometry o f the fracture network showed by a Variscan granite m assif where a recent landfill is operating. The obtained results strongly suggest that the spatial distribution of fractures at different scales, particularly those sets that are strongly connected, must be considered in any technical solution concerning the minimisation and control of leachate leaking and dispersion via systematic and detailed monitoring. It is also shown that proper scaling o f many of the geometric features displayed by natural fracture networks can be assessed by means o f fractal methods, thus providing insights for predicting the character of fractures in unexposed domains o f the rock mass, and supplying significant information to be used in fluid flow modelling. All these tasks are critical for a careful selection o f acceptable sites for landfills construction on top o f granite massifs as well as to design solutions to many problems concerning eventual leachate leaking and dispersion around dump cells. 1 Dep. Geologia & CREMINER, Fac. Ciências da Univ. Lisboa, Ed. C2, Piso 5, 1749-016 Lisboa 2 Dep. Geologia & LATTEX, Fac. Ciências da Univ. Lisboa, Ed. C2, Piso 5, 1749-016 Lisboa 3 Dep. Física & C. Geofísica, Fac. Ciências da Univ. Lisboa, Ed. C8, Piso 3, 1749-016 Lisboa 79 Versão integral disponível em digitalis.uc.pt

Multi-scale geometrical analysis of fracture networks in granite massifs and its application to landfill site selection