Geophysical investigation and the use of their results in the evaluation of the stability of slopes of artificial water reservoirs in the flysch Carpathians

Abstract

The article presents the possibility of using geophysical surveys to assess the stability of Carpathian slopes built of flysch deposits susceptible to mass movements. Landslide slopes located in the coastal zone of artificial water reservoirs are particularly susceptible to the loss of stability due to the erosion of this zone and the changing water level in the reservoir. Geophysical surveys of landslides carried out as a part of the research programs: PR-7 carried out by IMGW in 1972–1980 and SOPO carried out by PGI in 2009–2016 made it possible to develop a methodology of geophysical surveys enabling the determination of the geometry (course of the slip surface and range levels) of the existing landslides, information necessary to carry out a computational analysis of their stability. Examples of geometry of landslides in the coastal zone of the Czorsztyn reservoir and landslides in the area of hydrotechnical drifts of the Swinna-Poreba dam were presented. The possibility of a quantitative evaluation of the stability of the Carpathian slopes was also proposed on the basis of the SMR ( Slope Mass Rating) proposed by M. Romana, using the KFG ( Klasyfikacja Fliszu-Geofizyczna) geophysical classification equivalent to the RMR ( Rock Mass Rating) classification by Z.T. Bieniawski for the assessment of the massif. A dozen or so active landslides were compiled for which the stability was determined using the SMR method.

Keywords

• geophysics
• hydroengineering
• landslides