Difference between revisions of "Avalanche character definition table"
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+ | ==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. | ||
+ | |||
+ | |||
{|class="TblConceptualModel" | {|class="TblConceptualModel" | ||
|- | |- | ||
|class="Header"|Character | |class="Header"|Character | ||
− | |class="Header"|Weak Layer / Interface | + | |class="Header"|Weak Layer /<br/>Interface |
|class="Header"|Slab Property | |class="Header"|Slab Property | ||
|class="Header"|Persistence | |class="Header"|Persistence | ||
− | |class="Header"|Weak Layer Location | + | |class="Header"|Weak Layer<br/>Location |
− | |class="Header"|Propagation Potential | + | |class="Header"|Propagation<br/>Potential |
− | |class="Header"|Relative Size Potential | + | |class="Header"|Relative Size<br/>Potential |
|- | |- | ||
|class="Class"|Loose Dry | |class="Class"|Loose Dry | ||
Line 14: | Line 19: | ||
|Hours/days | |Hours/days | ||
|Near the surface | |Near the surface | ||
− | |Down slope | + | |Down slope entrainment |
|R1-2 | |R1-2 | ||
|- | |- | ||
Line 50: | Line 55: | ||
|- | |- | ||
|class="Class"|Persistent Slabs | |class="Class"|Persistent Slabs | ||
− | |PWLs such as SH, FC, CR, FC/CR combo | + | |PWLs such as SH, FC,<br/>CR, FC/CR combo |
|4F-P<br/>Stiff-hard | |4F-P<br/>Stiff-hard | ||
|Weeks/months | |Weeks/months | ||
Line 58: | Line 63: | ||
|- | |- | ||
|class="Class"|Deep Persistent Slabs | |class="Class"|Deep Persistent Slabs | ||
− | |PWLs such as DH, FC, CR, FC/CR combo | + | |PWLs such as DH, FC,<br/>CR, FC/CR combo |
|1F-K<br/>Hard | |1F-K<br/>Hard | ||
|Weeks/months | |Weeks/months | ||
Line 74: | Line 79: | ||
|- | |- | ||
|class="Header"|Comment | |class="Header"|Comment | ||
− | |Typical failure plane | + | |class="Comment"|Typical failure plane |
− | |Typical kind of slab | + | |class="Comment"|Typical kind of slab |
− | |Typical duration of instability | + | |class="Comment"|Typical duration of instability |
− | |Relative to HS | + | |class="Comment"|Relative to HS |
− | |Typical expectation | + | |class="Comment"|Typical expectation |
− | |Typical range of size relative to path | + | |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 16:18, 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.