Difference between revisions of "Avalanche character definition table"
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| − | {|class=" | + | ==Definition== |
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| + | Identify the Avalanche Character(s) that best represents the avalanche problem(s) within the defined Location. When multiple characters exist, they should be prioritized in order of importance. | ||
| + | |||
| + | |||
| + | {|class="TblConceptualModel" | ||
|- | |- | ||
| − | |Character | + | |class="Header"|Character |
| − | |Weak Layer / Interface | + | |class="Header"|Weak Layer /<br/>Interface |
| − | |Slab Property | + | |class="Header"|Slab Property |
| − | |Persistence | + | |class="Header"|Persistence |
| − | |Weak Layer Location | + | |class="Header"|Weak Layer<br/>Location |
| − | |Propagation Potential | + | |class="Header"|Propagation<br/>Potential |
| − | |Relative Size Potential | + | |class="Header"|Relative Size<br/>Potential |
|- | |- | ||
| − | | | + | |class="Class"|Loose Dry |
| − | |Various (no cohesion) | + | |Various<br/>(no cohesion) |
|None | |None | ||
|Hours/days | |Hours/days | ||
|Near the surface | |Near the surface | ||
| − | |Down slope | + | |Down slope entrainment |
|R1-2 | |R1-2 | ||
| + | |- | ||
| + | |class="Class"|Loose Wet | ||
| + | |Various<br/>(no cohesion) | ||
| + | |None | ||
| + | |Hours/days | ||
| + | |Any level | ||
| + | |Significant down slope entrainment | ||
| + | |R1-3 | ||
| + | |- | ||
| + | |class="Class"|Wind Slabs | ||
| + | |DF, PP | ||
| + | |4F-K<br/>wind transported | ||
| + | |Hours/days | ||
| + | |Upper pack | ||
| + | |Terrain features | ||
| + | |R1-3 | ||
| + | |- | ||
| + | |class="Class"|Storm Slabs | ||
| + | |PP, DF | ||
| + | |F-P<br/>Soft-stiff | ||
| + | |Hours/days | ||
| + | |In or just below storm snow | ||
| + | |Path | ||
| + | |R1-4 | ||
| + | |- | ||
| + | |class="Class"|Wet Slabs | ||
| + | |Various | ||
| + | |4F-P<br/>Wet grains | ||
| + | |Hours/days | ||
| + | |Midpack to deep | ||
| + | |Path | ||
| + | |R1-5 (climax) | ||
| + | |- | ||
| + | |class="Class"|Persistent Slabs | ||
| + | |PWLs such as SH, FC,<br/>CR, FC/CR combo | ||
| + | |4F-P<br/>Stiff-hard | ||
| + | |Weeks/months | ||
| + | |Upper to midpack | ||
| + | |Path to adjacent path | ||
| + | |R2-4 | ||
| + | |- | ||
| + | |class="Class"|Deep Persistent Slabs | ||
| + | |PWLs such as DH, FC,<br/>CR, FC/CR combo | ||
| + | |1F-K<br/>Hard | ||
| + | |Weeks/months | ||
| + | |Deep or basal | ||
| + | |Path to adjacent paths | ||
| + | |R3-5 (climax) | ||
| + | |- | ||
| + | |class="Class"|Cornice | ||
| + | |~ | ||
| + | |~ | ||
| + | |Months with short peaks | ||
| + | |~ | ||
| + | |~ | ||
| + | |~ | ||
| + | |- | ||
| + | |class="Header"|Comment | ||
| + | |class="Comment"|Typical failure plane | ||
| + | |class="Comment"|Typical kind of slab | ||
| + | |class="Comment"|Typical duration of instability | ||
| + | |class="Comment"|Relative to HS | ||
| + | |class="Comment"|Typical expectation | ||
| + | |class="Comment"|Typical range of size relative to path | ||
|} | |} | ||
| + | |||
| + | |||
| + | '''Source''': | ||
| + | Statham, G., Haegeli, P., Birkeland, K. W., Greene, E., Israelson, C., Tremper, B., et al. (2010). ''A conceptual model of avalanche hazard''. Paper presented at the International Snow Science Workshop, Lake Tahoe, CA. | ||
| + | |||
| + | ==Related documents== | ||
| + | *[[Hazard assessment module]] | ||
Latest revision as of 15:18, 20 March 2017
Definition
Identify the Avalanche Character(s) that best represents the avalanche problem(s) within the defined Location. When multiple characters exist, they should be prioritized in order of importance.
| Character | Weak Layer / Interface |
Slab Property | Persistence | Weak Layer Location |
Propagation Potential |
Relative Size Potential |
| Loose Dry | Various (no cohesion) |
None | Hours/days | Near the surface | Down slope entrainment | R1-2 |
| Loose Wet | Various (no cohesion) |
None | Hours/days | Any level | Significant down slope entrainment | R1-3 |
| Wind Slabs | DF, PP | 4F-K wind transported |
Hours/days | Upper pack | Terrain features | R1-3 |
| Storm Slabs | PP, DF | F-P Soft-stiff |
Hours/days | In or just below storm snow | Path | R1-4 |
| Wet Slabs | Various | 4F-P Wet grains |
Hours/days | Midpack to deep | Path | R1-5 (climax) |
| Persistent Slabs | PWLs such as SH, FC, CR, FC/CR combo |
4F-P Stiff-hard |
Weeks/months | Upper to midpack | Path to adjacent path | R2-4 |
| Deep Persistent Slabs | PWLs such as DH, FC, CR, FC/CR combo |
1F-K Hard |
Weeks/months | Deep or basal | Path to adjacent paths | R3-5 (climax) |
| Cornice | ~ | ~ | Months with short peaks | ~ | ~ | ~ |
| Comment | Typical failure plane | Typical kind of slab | Typical duration of instability | Relative to HS | Typical expectation | Typical range of size relative to path |
Source:
Statham, G., Haegeli, P., Birkeland, K. W., Greene, E., Israelson, C., Tremper, B., et al. (2010). A conceptual model of avalanche hazard. Paper presented at the International Snow Science Workshop, Lake Tahoe, CA.
