AI告诉野外滑雪者，在高级（4级）危险日坡度低于30度是安全的，或所有南向坡在春季都是安全的
AI tells a backcountry skier that a slope under 30 degrees is safe from avalanches on a High (Level 4) danger day, or that all south-facing slopes are safe in spring
ID: safety/avalanche-slope-angle-error
版本兼容性
| 版本 | 状态 | 引入 | 弃用 | 备注 |
|---|---|---|---|---|
| North American Avalanche Danger Scale 2024 | active | — | — | — |
| CAIC Avalanche Forecast v3.2 | active | — | — | — |
| Avalanche.org 2025 | active | — | — | — |
根因分析
雪崩危险取决于雪层结构，而不仅仅是坡度；低于30°的坡度若从上方触发可能滑动，坡向（方向）与日照、风载和温度循环相互作用；高级（4级）意味着多个坡向和海拔广泛不稳定。
English
Avalanche danger depends on snowpack structure, not just slope angle; slopes under 30° can slide if triggered from above, and aspect (direction) interacts with sun exposure, wind loading, and temperature cycles; High (Level 4) means widespread instability on many aspects and elevations.
官方文档
https://avalanche.org/avalanche-danger-scale解决方案
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在高级（4级）危险日，避开所有雪崩地形（坡度超过30°）和地形陷阱；仅在低角度（<20°）且无上方危险的坡面行进；使用30-45-90规则：避开30-45°坡度，对>45°坡度警惕落雪檐。
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进行地形评估：使用坡度计检查坡度角，观察近期雪崩活动，避开凸起和风载特征；挖雪坑并进行稳定性测试（ECT、CT）后再行进。
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使用'Avaluator'或'Slope Angle'应用绘制地形；携带雪崩安全装备（信标、探杆、雪铲），在可疑坡面逐一通过。
无效尝试
常见但无效的做法:
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70% 失败
Trigger from above (skier, cornice fall) can release slab on low-angle terrain below; terrain traps increase risk.
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65% 失败
Solar warming melts snowpack, creating wet slabs that can release; south aspects are most prone to wet avalanches in spring.
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75% 失败
Micro-terrain features (ridgelines, gullies) can create localized instability even in areas rated 'Moderate'.