Historical and current evolution of the landslide area near Třebenice

Shallow movements in clay rich rocks detected during subnormal percipitation period

“…Changes in the speed of the movement with an annual periodicity are in consistence with previous research on this locality (Novotný et. al., 2008;Balek et. al., 2015).…”

“…The monitoring consists of two profiles controlled with portable tape extensometer and various hydrogeological observation boreholes where GWLs were manually recorded and different types of piezometers were installed for several years period (Novotný and Kobr, 2008;Novotný et al, 2006). Detected seasonal creep (Novotný, 2002) and repeated major movement phases (1938, 1939, 1970, 1981Balek et al, 2015) of this landslide suggest that its stability is near the equilibrium state with periods of unstable conditions. This is why the studied landslide has been partly stabilized in the early 1980´, with measures focusing on the operability of the railroad, while omitting the stability of the local asphalt road.…”

“…The whole landslide was firstly identified in 1916 (Novotný, 2002) and its recently mapped total area is 28,000 m 2 with the mean slope angle of 12°a nd the altitude between 240 and 285 m a.s.l. It is formed by several partial landslides which have been re-activated several times in the recent history (Balek et al, 2015). The partial landslide described in this work has complex sliding surface up to 5 m deep and has been monitored since 1994 (Novotný, 1998;Novotný, 2002;A in Fig.…”

“…Total horizontal displacements detected by the SAA sensor in the depths of 1.1 m (A) and 2.3 m (B) during April 2017 -December 2018 are shown along with the surface movements detected by trigonometric measurements (C) during April 2013 -December 2015 byBalek et al (2015).…”