Articles | Volume 9, issue 3
Nat. Hazards Earth Syst. Sci., 9, 895–904, 2009
Nat. Hazards Earth Syst. Sci., 9, 895–904, 2009

  18 Jun 2009

18 Jun 2009

Groundwater processes in a complex landslide, northern Apennines, Italy

F. Ronchetti1, L. Borgatti2, F. Cervi1, C. Gorgoni1, L. Piccinini3, V. Vincenzi3, and A. Corsini1 F. Ronchetti et al.
  • 1Department of Earth Sciences, Modena and Reggio Emilia University, Modena, Italy
  • 2Department of Structural, Transport, Hydraulic, Survey and Territorial Engineering – DISTART, Bologna University, Bologna, Italy
  • 3Department of Earth Sciences, Ferrara University, Ferrara, Italy

Abstract. The hydrogeological characteristics of roto-translational slides in flysch are complex, due to the inherent anisotropy and heterogeneity of rock masses and related deposits. The paper deals with the hydrogeological characterization of a reactivated roto-translational slide affecting Cretaceous flysch rocks, located in the northern Apennines of Italy. Continuous monitoring of groundwater levels, in-situ permeability and pumping tests, hydrochemical and physical analyses and Uranine tracers were the adopted prospecting methods.

In this research hydrological monitoring and investigation are summarized in order to define a hydrogeological conceptual model of the landslide source area. Results showed that two overlaying hydrogeological units exist at the slope scale: the first is unconfined, but highly compartmentalized, and hosted in the fractured and dismembered rock slide body. The second is confined and lays in the undisturbed flysch below the sliding surface. The groundwater level in the confined hydrogeological unit is twenty meters higher than the groundwater level in the uppermost one. Moreover, the groundwater chemistry characterization revealed a rising of deep fluids in the landslide area.