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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Impulse wave modelling and corresponding underwater landslide deposition
Impulse wave modelling and corresponding underwater landslide deposition
Author : HELGE FUCHS (1) & WILLI H. HAGER(2)
ABSTRACT
Impulse waves are considered a severe danger amongst natural hazards in mountainous regions. They are generated in
lakes or reservoirs following a landslide, rockslide, rockfall, avalanche or glacier impact. The resulting long waves are of
cnoidal-, solitary, Stokes or bore type. The usually short propagation distance and the corresponding negligible wave
attenuation lead to a massive damage potential. Damages at the opposite shore are generated due to direct wave
impact on buildings and structures, driftwood and float, and their deposits after water retreat. Possible dam overtopping
may lead to structural damages or even a total failure for a reservoir. The generated flood wave may then propagate
downstream endangering distant settlements. The latter scenario occurred in 2010 near Carhuaz, Peru. A 300,000 m3
rock-ice avalanche impacted a glacier lake leading to wave overtopping of 1 106 m3 of water. The generated flood
wave caused significant damages to the village of Carhuaz, located 15 km downstream to the glacier lake. In the course
of global warming, glacier retreat creates additional glacier lakes increasing the hazard risk for mountainous regions.
Using the VAW impulse wave computation guideline a possible event can be assessed in advance. However, valuable
information following a back-analysis of past slide events applies to calibrate the calculation procedure. Video recordings
of 41 slide-generated impulse wave tests in a two-dimensional wave channel were therefore analyzed regarding the
underwater slide dynamics and their final deposition patterns. Correlation equations for specific slide deposit features
e.g. its length and thickness were defined. This work thus contributes to the estimation of risk assessment and to safety
aspects relating to wave-shore interaction.
File Size : 4,581,818 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 13/08/2015
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