Causes Of Debris Flow Formation In Flysch Area
Of North Istria, Croatia
Author(s)
Ž. Arbanas, Č . Benac & V. Jurak
Abstract
The central and northern parts of the Istrian Peninsula situated in the
northwestern part of the Croatian Adriatic coast are formed within the Paleogene
flysch rock complex. The flysch zone in the northeastern part of the peninsula
borders with the Ć i ć arija Mountain Range, which mostly consists of carbonate
rocks. The occurrences of debris flows that cause huge damage to transport and
other constructions are quite frequent. In this paper, we present the causes and
triggering mechanisms of debris flows sporadically occurring in the Krbav č i ć i
village area near the city of Buzet. The potentially unstable soil mass formed by
the erosion of the flysch bedrock fills the narrow and long ravines cut into the
flysch bedrock all the way to the limestone slopes of the Ć i ć arija Mountain
Range. This paper describes in detail the occurrence of a particular debris flow
along with its repetitive appearances in the period from the winter of 1979 until
today. The debris flow mass damaged the road embankment and caused its
downslope slide in the length of about 300 m in one night in the winter of 1979.
The movement of the debris mass triggered in the ravine put into danger the
bridge constructed over an old unstable zone in the winter of 2003, however fast
intervention measures prevented the possible damage.
Keywords: debris flow, landslide, flysch, triggering mechanism.
1 Introduction
In the northern part of the Istrian Peninsula there is a clearly visible boundary
between two geomorphological units, namely the hilly Paleogene flysch basin,
Keywords
debris flow, landslide, flysch, triggering mechanism.
Related Book
Other papers in this volume
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