the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Avalanche Impact Pressures on Structures with Upstream Pile-Up/Accumulation Zones of Compacted Snow
Abstract. Existing methods to calculate snow avalanche impact pressures on rigid obstacles are based on the assumption of no upslope pile-up of snow behind the structure at impact. Here we develop a method to predict avalanche impact pressures that accounts for the compaction and accumulation process. We show why this process leads to large impact pressures even at low avalanche approach velocities. The induced pressure depends on the incoming avalanche flow density relative to the ultimate compaction density because this determines the avalanche braking distance and therefore the flow deceleration in the upstream direction. The pile-up/accumulation process induces two additional pressures: (1) the static pressure of the pile-up zone and (2) the tractive stresses operating on the shear planes interfacing the accumulated and still moving avalanche snow. We demonstrate the use of the model on two theoretical examples and one real case study. Avalanche mitigation in maritime regions, or regions undergoing climate change with increasing wet snow avalanche activity, should consider the forces caused by the pile-up/accumulation process in engineering design.
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- SC1: 'Short Comment on: "Avalanche Impact Pressures on Structures with Upstream Pile-Up/Accumulation Zones of Compacted Snow"', Peter Gauer, 24 Sep 2018
- AC1: 'Pile-up and avalanche impact pressures', Perry Bartelt, 26 Sep 2018
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RC1: 'Impact pressure due to snow avalanche', Anonymous Referee #1, 09 Oct 2018
- AC6: 'Reply to Reviewer 1', Perry Bartelt, 20 Nov 2018
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RC2: 'Referee Comment', Anonymous Referee #2, 15 Oct 2018
- AC7: 'Reply to Reviewer 2', Perry Bartelt, 20 Nov 2018
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RC3: 'Review of the paper entitled "Avalanche Impact Pressures on Structures with Upstream Pile-Up/Accumulation Zones of Compacted Snow" by Perry Bartelt et al.', Thierry Faug, 19 Oct 2018
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AC2: 'Shock wave? Mass conservation, inelasticity and pile-up', Perry Bartelt, 24 Oct 2018
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RC4: 'Response to last comment by Perry Bartelt and co-authors: mass conservation', Thierry Faug, 25 Oct 2018
- AC3: 'Thierry's mass balance is incorret', Perry Bartelt, 26 Oct 2018
- AC5: 'Where is the mass with zero velocity?', Perry Bartelt, 30 Oct 2018
-
RC4: 'Response to last comment by Perry Bartelt and co-authors: mass conservation', Thierry Faug, 25 Oct 2018
-
AC2: 'Shock wave? Mass conservation, inelasticity and pile-up', Perry Bartelt, 24 Oct 2018
-
SC2: 'Reynolds transport theorem for the case when a volume is intersected by a moving discontinuity surface', Peter Gauer, 27 Oct 2018
- AC4: 'Where is the mass with velocity zero', Perry Bartelt, 30 Oct 2018
-
RC5: 'Comment', Anonymous Referee #4, 31 Oct 2018
- AC8: 'Response to reviewer 4', Perry Bartelt, 20 Nov 2018
-
RC6: 'Impact of a flow against a wall: mass conservation across the discontinuity formed', Thierry Faug, 01 Nov 2018
- AC9: 'Response to Thierry Faug', Perry Bartelt, 20 Nov 2018
- SC1: 'Short Comment on: "Avalanche Impact Pressures on Structures with Upstream Pile-Up/Accumulation Zones of Compacted Snow"', Peter Gauer, 24 Sep 2018
- AC1: 'Pile-up and avalanche impact pressures', Perry Bartelt, 26 Sep 2018
-
RC1: 'Impact pressure due to snow avalanche', Anonymous Referee #1, 09 Oct 2018
- AC6: 'Reply to Reviewer 1', Perry Bartelt, 20 Nov 2018
-
RC2: 'Referee Comment', Anonymous Referee #2, 15 Oct 2018
- AC7: 'Reply to Reviewer 2', Perry Bartelt, 20 Nov 2018
-
RC3: 'Review of the paper entitled "Avalanche Impact Pressures on Structures with Upstream Pile-Up/Accumulation Zones of Compacted Snow" by Perry Bartelt et al.', Thierry Faug, 19 Oct 2018
-
AC2: 'Shock wave? Mass conservation, inelasticity and pile-up', Perry Bartelt, 24 Oct 2018
-
RC4: 'Response to last comment by Perry Bartelt and co-authors: mass conservation', Thierry Faug, 25 Oct 2018
- AC3: 'Thierry's mass balance is incorret', Perry Bartelt, 26 Oct 2018
- AC5: 'Where is the mass with zero velocity?', Perry Bartelt, 30 Oct 2018
-
RC4: 'Response to last comment by Perry Bartelt and co-authors: mass conservation', Thierry Faug, 25 Oct 2018
-
AC2: 'Shock wave? Mass conservation, inelasticity and pile-up', Perry Bartelt, 24 Oct 2018
-
SC2: 'Reynolds transport theorem for the case when a volume is intersected by a moving discontinuity surface', Peter Gauer, 27 Oct 2018
- AC4: 'Where is the mass with velocity zero', Perry Bartelt, 30 Oct 2018
-
RC5: 'Comment', Anonymous Referee #4, 31 Oct 2018
- AC8: 'Response to reviewer 4', Perry Bartelt, 20 Nov 2018
-
RC6: 'Impact of a flow against a wall: mass conservation across the discontinuity formed', Thierry Faug, 01 Nov 2018
- AC9: 'Response to Thierry Faug', Perry Bartelt, 20 Nov 2018
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- 1
Perry Bartelt
Andrin Caviezel
Sandro Degonda
Othmar Buser
flowregime and a
pile-upregime. In the flow regime, snow does not accumulate behind the obstacle. We show why the accumulation of avalanche snow behind a structure can lead to immense forces that must be considered in mitigation.