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.
Log On
About IAHRDirectoryCommitteesMy IAHRNews & JournalseLibraryeShopEventsJoin IAHRWorld CongressDonate
spacer.gif
spacer.gif eLibrary
spacer.gif eLibrary
You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Impulse waves generated by snow avalanches falling into lakes
Impulse waves generated by snow avalanches falling into lakes
Author : GIANLUCA ZITTI(1), CHRISTOPHE ANCEY(2), MATTEO POSTACCHINI(1) & MAURIZIO BROCCHINI(1)
ABSTRACT
In recent years, the number of water reservoirs in high-altitude areas has increased. They are often used to provide
water for various activities related with recreational (i.e. skiing) and production activities. Many of such reservoirs are
threatened by snow avalanches. To investigate the phenomenon, an experimental study was carried out at the Ecole
Polytechnique F®¶d®¶rale de Lausanne using a prismatic 3m-long flume. A mass of buoyant particles, initially at rest, was
released into a water flume down a 30°„-sloping ramp. Its impact with the water surface was analyzed in detail. During
the tests, the impacting mass, the water depth in the flume and the ramp length were changed. Both the dynamics of the
granular mass at the impact zone and the wave generation induced by the impact were acquired using a high-frequency
camera and accurately analyzed. An analysis of the wave propagation along the flume, also captured by two lowerspeed
cameras, was made by mean of numerical analyses based on a depth-averaged Boussinesq-type model. A
theoretical analysis has also been undertaken to assess how the sub-aerial mass dynamics influences energy
dissipation, and to identify the key variables of the problem, i.e. the velocity at impact, the shape of the water volume
displaced during the impact, the depth of the center of the submerged mass and the percentage of submerged mass.
File Size : 2,694,575 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 19/08/2015
Download Now