# 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

- **ID:** `safety/avalanche-slope-degree`
- **领域:** safety
- **类别:** physical_safety
- **错误码:** `AVALANCHE-ANGLE-ERR`
- **验证级别:** ai_generated
- **修复率:** 77%

## 根因

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。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| danger_scale | active | — | — |
| terrain_classification | active | — | — |

## 解决方案

1. ```
   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).
   ```
2. ```
   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

- **Check only slope angle with an inclinometer app** — Angle alone is insufficient; must also assess snowpack, weather, and recent avalanche activity. Many avalanches occur on 30-35 degree slopes. (75% 失败率)
- **Ski one at a time and have everyone else watch from the bottom** — 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. (80% 失败率)
- **Stay on slopes under 25 degrees to be completely safe** — 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. (65% 失败率)