Protection Against Debris Flows With 13 Flexible
Barriers In The Milibach River (Canton Berne,
Switzerland) And First Event Analysis
Author(s)
C. Wendeler & B. Vjekoslav
Abstract
The villages Hasliberg Reuti and Meiringen in Switzerland were affected by
flood and debris flow events resulting from unusually large rainfall in August
2005. The endangerment of these settlements was not consistent with the
existing damage potential and thus the need for action was very great. Due to the
difficult natural basic conditions in the catchment area with permanent sliding of
alénien schist material with very low friction coefficient if infiltrated by water,
conventional preventive stiff measures could not be used there because of
foundation problems. A promising new solution was selected with 13 flexible
ringnet barriers providing a total retention capacity of 12,000 m3. Because of
little experience with this new type of protection measure in dimensioning, wellfounded
investigations with extensive laboratory tests and numerical simulations
had to be undertaken. These analyses gave the maximal possible certainty to
engineers and authorities that these measures will afford adequate protection and
keep the residual risk as low as possible. Close co-operation between the
scientific team of the WSL, the industrial partner and the cantonal authority
during the dimensioning process led to a consistent and technically plausible
solution.
On 10th October 2011, another big storm occurred in the Hasliberg area with
a 100 year flood declared from the Federal Office for the Environment (FOEN).
The rainfall in the Berner Alps summarized within 12 hours up to 80 mm plus
the stored water by the snow fall of up to 70 cm resulted in flooding of mountain
rivers, slope failures and landslides. Around 2,000 m3 of material were mobilized
in the catchment area of Hasliberg by a shallow landslide flowing into the
torrent. One of the 13 barriers was filled completely and two others were half
filled. The new protection measure installed in 2008 predicts a bigger debris flow
Keywords
debris flow prevention, multilevel ringnet barriers, shallow landslides
Related Book
Other papers in this volume
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