Risk Management In Lattenbach:
A Case Study From Austria
Author(s)
J. Hübl & M. Moser
Abstract
The catchment area of Lattenbach in the District of Landeck, Tyrol, Austria is
prone to debris flows. Large mass movements represent debris sources within the
catchment. Debris flows, documented since 1907, pose a threat to buildings in
the village of Pians. The construction of technical mitigation measures date back
to 1908. Up to now, numerous check dams have been built. However, in the
transit section of the channel, many of them are damaged or destroyed.
Therefore, the former technical protection concept had to be reconsidered. A
general risk management concept was conducted, including a detailed risk
analysis. The risk analysis was based on a detailed analysis of former debris-flow
events and field survey in order to collect input parameters for process analysis.
Different scenarios were calculated, varying the input hydrograph, the volume of
potential debris sources and the sediment concentration. The simulation results
were used to derive intensity maps for the prone settlement area. In a subsequent
step, an impact analysis resulted in the determination of areas bearing a lack of
safety was carried out, and an appropriate map was generated. Risk management
in the Lattenbach area was based on a protection concept that combines active
and passive mitigation measures. Active measures include a temporary debris
storage basin in the transit section to lower the peak discharge, and an
improvement of the hydraulic transport capacity of the receiving stream to
reduce backwater effects. Passive mitigation measures are based on an existing
monitoring system, which was technically improved to an information system in
order to provide information to local authorities if a debris flow will occur.
Keywords: risk analysis, risk management, torrent control, debris flows.
Keywords
risk analysis, risk management, torrent control, debris flows.
Related Book
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