First EAGE Workshop on Assessment of Landslide and Debris Flows Hazards in the Carpathians

Date
17 - 20 June
Location
Lviv, Ukraine
Registration
Closed
Call for papers
Closed

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One-day field trip will take place from Lviv to Mukachevo in Lviv and Transcarpathian regions of Ukraine. This area features active development of landslide phenomena, debris flows, karst, floods and side erosion of river beds. Field equipment for the assessment  of geohazards will be demonstrated.

Our route will cross several structural and tectonic zones of Ukrainian Carpathians, including Subcarpathian Foredeep Trough, Folded Carpathians and Transcarpathian Deep Fault. We shall see reference cross-section of Cretaceous and Paleogene flysch deposits and Neogene volcanic suites.

These zones feature various manifestations of geological hazards caused by human impact and/or natural factors.

The journey will start in Stebnik village (Lviv Region), where a huge, 300 m in diameter and over 50 m deep karst sinkhole is located. Subsurface cavities of considerable sizes in this area are caused by devastating mining of Potassium salts in 70-80-ies of XX century. For many years, seismologists and scientists alerted about avalanching hazards in these sinkholes during local earthquakes.

Karst sinkhole in Stebnik village (Lviv region)

We shall get acquainted with the operation and results from seismic stations of Carpathian region, providing online data and helping to assess the impact of seismicity on the development of geohazards.

The field trip will continue through the picturesque area of Folded Carpathians.  We shall observe landslide and avalanching processes of various kinds, river erosion, landslides and rockfalls. 

 

Landslide in Kolchino village

One of our observation points will be a major landslide in Kolchino village (Transcarpathian region), which emerged May 10, 2018 and caused catastrophic devastations. One of the sources of this accident is human activity: generation of huge spoil banks in a quarry on the upper part of the hill above dwelling houses.

We shall see the outcrops of Neogene basalts with columnar and slab jointings.  The geometry of lava stacks allows to trace the lava flows. The quarry uncovers lava flows near a volcano chimney with magmatic eruption.

Outcrops of Neogene basalts in Kolchino village

Active landslide processes will be a subject of our inspection in Golubine village. We shall speculate about possible causes of these processes. The principal factors in their formation are structural and tectonic features of the area and active destructive zones in Cretaceous and Paleogene flysch deposits. We shall discuss the potential use of GPR for prognosis of such processes.

The journey will end in the village Abranka, Volovets District of Transcarpathian Region, constantly suffering from debris flows. These flows are unpredictable and have high velocity ranging from 2 to 10 m/s. Flows have high content of a solid material mass. Mass movements have caused major human and economic losses. Increasing human occupation of the attractive mountain areas over the past decades has increased the need to better understand the debris flow processes and to predict their formation. We shall see the consequences of mudflows and consider main factors of their formation. We shall learn principal stages of field data collection for mathematical simulation of mudflows and assessment of their hazardous impact on the infrastructure.

 

Devastation from debris flows in Abranka village (Volovets District, Transcarpathian Region)