en
Doctoral thesis
Open access
French

Characteristics of glacial lake hazards and extreme flow events: advanced approaches to model processes and process chains

Defense date2012-12-19
Abstract

Glaciated high-mountain regions are particularly susceptible to climate change and associated changes in hazard situations. Glacier retreat is observed in most mountain regions of the world, which has given rise to the formation of numerous new glacial lakes. They are often located in remote and dynamic environments and – depending on the dam and lake type – may become unstable and prone to catastrophically burst out. Sporadic glacial lake outburst floods (GLOF) can evolve into highly mobile flows, which can pose a real threat in case they reach populated regions or infrastructure where they can cause inundation or massive deposition of sediment. Extreme flow events in high mountain regions can be caused by sources other than glacial lakes: Glacier-covered volcanos have, for instance, repeatedly caused severe disasters in the past. Through volcano-glacier interactions large amounts of water can be released and highly destructive flows (lahars) can form due to sediment entrainment. Highly dynamic and unsteady flow behavior of extreme flow events is typical, rendering risk assessments altogether a real challenge. The aim of this thesis therefore was to improve our understanding of the onset, propagation and potential impact of extreme flow events and to provide insights into complex processes and process chains. For this purpose field- and modeling based analysis of illustrative past and potential future events was carried out. Furthermore this thesis aimed at providing a compilation of existing and state-of-the-art modeling tools to simulate various types of extreme flow events.

fre
Keywords
  • Extreme flow events
  • Glacial lake outburst floods (FLOF)
  • Lahar
  • Glacial lake inventory
  • Indian Himalayas
  • Andes
  • Pamir
  • Alps
  • Flow modeling
  • Dam breach modeling
  • FLO-2D
  • LAHARZ
  • BASEMENT
Citation (ISO format)
WORNI, Raphaël Philipp. Characteristics of glacial lake hazards and extreme flow events: advanced approaches to model processes and process chains. 2012. doi: 10.13097/archive-ouverte/unige:26612
Main files (1)
Thesis
accessLevelPublic
Identifiers
718views
812downloads

Technical informations

Creation03/06/2013 11:11:00 AM
First validation03/06/2013 11:11:00 AM
Update time03/14/2023 8:04:13 PM
Status update03/14/2023 8:04:13 PM
Last indexation01/29/2024 7:40:37 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack