STRUCTURAL VULNERABILITY AND RISK ASSESSMENT OF HARGHITA COUNTY’S INNER ROAD
NETWORK
Zsolt Magyari-Sáska1, Stefan Dombay1
1 Babeș-Bolyai University, Cluj-Napoca, e-mail: zsmagyari@gmail.com; dombay.istvan@gmail.com
Abstract – Structural Vulnerability and Risk Assessment of Harghita
County’s Inner Road Network. Road transportation systems has become
indispensable in everyday life. They have a high importance in global economic
circuit, thus their vulnerability and risk analysis is indispensable. In this
paper we want to make an intrinsic characterization the road network
infrastructure of Harghita’s county. Our vulnerability assessment was based on
the internal structure of the road network using elements from graph theory. We
identified that the majority of the settlements are loosely coupled with each
other, after three random edge failure the road network becomes unconnected. We
also identified the heavily loaded route segments with the assumption of using
the shortest distance path. These are the most vulnerable parts of road network.
The failure of two of these route segments can lead to the isolation of the
county seat from the other major cities. By developing a simulation environment
in R we could model the consequences of any edge failure in terms of detour
length and number of traveling persons which couldn’t reach their destination.
Through this latter evaluation we made the risk assessment of the road network,
calculating the number of traveling persons which are locked to their
destination.
Keywords: vulnerability, road network, Harghita county, graph theory, R,
simulation, betweeness
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