Slide-induced Impulse Waves in the Context of Periglacial Hydropower Development: Ondes d’impulsion générées par glissements dans le contexte du développement del’hydroélectricité périglaciaire

• Main Authors: Evers, Frederic M., Boes, Robert
• Other Authors: International Commission on Large Dams
• Format: Conference Object
• Language: English
• Published: CRC Press 2022
• Subjects: Analysis; Emergency Planning; Freeboard; Heightening; Hydraulic Model Test; Ice; Landslide; Overtopping; Reservoir Operation; Reservoir Slope; Risk Assessment; Safety of Dams; Wave; info:eu-repo/classification/ddc/624; Civil engineering; permafrost
• Online Access: https://hdl.handle.net/20.500.11850/563671; https://doi.org/10.3929/ethz-b-000563671

Due to retreating glaciers, new potential locations for the construction of dams for hydropower and other purposes will open up in the near to long-term future. The periglacial environment of these facilities is increasingly affected by mass wasting processes. In addition to snow avalanches and glacier break-offs, unstable slopes previously supported by glacier ice and the thawing of permafrost due to rising mean air temperatures pose a risk to future reservoirs: If these landslides enter a reservoir at high speed, tsunami-like impulse waves are generated. The dam structure as the lowest situated shore area is particularly endangered and can be overtopped by relatively small waves. Impulse waves therefore represent a risk that must be taken into account when planning new facilities. About a decade ago, the Laboratory for Hydraulics, Hydrology and Glaciology (VAW) proposed a computational procedure for the assessment of impulse wave events with a special focus on reservoirs. Recently, a second updated edition of this ‘impulse wave manual’ was published. This contribution presents a procedure for the hazard assessment of impulse waves in reservoirs. A special focus is given to the potentially wave-generating forms of mass movement in the periglacial environment and the hydraulic characteristics of small impulse wave events. En raison du recul des glaciers, de nouveaux sites potentiels pour la construction de barrages hydroélectriques et autres s’ouvriront à l’avenir proche et à long terme. L’environnement périglaciaire de ces installations est de plus en plus affecté par des processus de gaspillage de masse. Outre les avalanches de neige et les débâcles de glaciers, les pentes instables auparavant soutenues par la glace de glacier et le dégel du permafrost dû à l’augmentation des températures moyennes de l’air constituent un risque pour les futurs réservoirs : Si ces glissements de terrain pénètrent à grande vitesse dans un réservoir, des vagues d’impulsion de type tsunami sont générées. La structure du barrage, ...