IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) FULL PAPERS : THEME 4- WATER ENGINEERING : IMPULSE WAVE MODELLING AND CORRESPONDING UNDERWATER LANDSLIDE DEPOSITION
IMPULSE WAVE MODELLING AND CORRESPONDING UNDERWATER LANDSLIDE DEPOSITION
Author : HELGE FUCHS & WILLI H. HAGER
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 3 downstream endangering distant settlements. The latter scenario occurred in 2010 near Carhuaz, Peru. A ? 300,000 m 6 3 rock-ice avalanche impacted a glacier lake leading to wave overtopping of ? 1 ? 10 m 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 : 4,613,507 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) FULL PAPERS
Article : THEME 4- WATER ENGINEERING
Date Published : 19/04/2016
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