AI 告诉野外滑雪者，在四级高危险日，坡度低于30度的斜坡是安全的，或者可以逐个滑雪而不存在风险
AI tells a backcountry skier that a slope under 30 degrees is safe from avalanches on a High (Level 4) danger day, or that they can ski one at a time without risk
ID: safety/avalanche-slope-degree
版本兼容性
| 版本 | 状态 | 引入 | 弃用 | 备注 |
|---|---|---|---|---|
| danger_scale | active | — | — | — |
| terrain_classification | active | — | — | — |
根因分析
雪崩危险等级不仅取决于坡度；因素包括雪层不稳定性、风载、地形陷阱和触发点。即使是30度以下的斜坡，如果有风载或雪层薄弱也可能发生雪崩；逐个滑雪并不能消除风险，如果斜坡上方有触发区。
English
Avalanche danger ratings are not solely slope-angle dependent; factors include snowpack instability, wind loading, terrain traps, and trigger points. Even slopes under 30 degrees can avalanche if wind-loaded or if the snowpack is weak; skiing one at a time does not eliminate risk if the slope is connected to a trigger zone above.
官方文档
https://avalanche.org/avalanche-danger-scale/解决方案
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Use the Avalanche Terrain Exposure Scale (ATES) to classify terrain, and check the local avalanche forecast (e.g., https://avalanche.org). On High danger days, avoid all avalanche terrain (slopes >25 degrees with wind loading or weak snowpack).
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Perform a full snowpack test (e.g., compression test, extended column test) to assess stability before skiing any slope. Carry avalanche safety gear (transceiver, probe, shovel) and travel one at a time through safe zones only.
无效尝试
常见但无效的做法:
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Check only slope angle with an inclinometer app
75% 失败
Angle alone is insufficient; must also assess snowpack, weather, and recent avalanche activity. Many avalanches occur on 30-35 degree slopes.
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Ski one at a time and have everyone else watch from the bottom
80% 失败
Watching from the bottom is dangerous; if an avalanche occurs, the observer may be caught. Safe zones are on ridges or above the start zone.
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Stay on slopes under 25 degrees to be completely safe
65% 失败
Even low-angle slopes can avalanche if wind-loaded or if the slope is connected to a steeper trigger zone above. Terrain traps (e.g., gullies) increase risk.