Item: CASE MOSJøEN - CHALLENGING RISK MITIGATION IN THE TOWN CENTER DUE TO POWDER CLOUD AND AVALANCHE GENERATED FLOOD WAVES
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Title: CASE MOSJøEN - CHALLENGING RISK MITIGATION IN THE TOWN CENTER DUE TO POWDER CLOUD AND AVALANCHE GENERATED FLOOD WAVES
Proceedings: International Snow Science Workshop 2024, Tromsø, Norway
Authors:
- Priska Helene Hiller [ Norwegian Water Resources and Energy Directorate, NVE ]
- Anne Bruland Høyen [ Norwegian Water Resources and Energy Directorate, NVE ]
Date: 2024-09-23
Abstract: Parts of the center of the Norwegian town Mosjøen are prone to avalanche hazard. A river divides the town center from the steep slope of the mountain Øyfjellet. Hence, the avalanche hazard in the building area mainly consists of the pressure by the powder cloud, and flood waves caused by the impact when avalanches hit the river. The main challenges to mitigate avalanche risk in Mosjøen are connected to: i) Tools and understanding of the propagation and impact of powder clouds and impulse waves caused by snow avalanches; ii) Uncertainty on the effect and feasibility of mitigation measures. The current situation is a burden on the community as they need to balance risk mitigation and the development of the town center. Spatial development is at this moment limited due to the hazard zones. Physical mitigation measures will be costly within a range of 280-680 million NOK (about 24-58 mill. EUR) and will take time to be designed and constructed. This contribution focuses on risk mitigation and its technical and physical as well as legal, political and other non-technical challenges. The case will be presented with a timeline focusing on the mentioned challenges, ring actions and collaboration.
Object ID: ISSW2024_O7.2.pdf
Language of Article: English
Presenter(s): Priska Helene Hiller, Anne Bruland Høyen
Keywords: risk mitigation, powder cloud, flood wave, snow avalanche
Page Number(s): 808 - 811
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