Debris flows triggered from rapid melt of seasonal snow, and/or ice within the active layer have not been studied in periglacial areas of the semi‐arid Andes. Therefore, through a representative watershed we investigated the thermo‐radiative characteristics, possible water sources, and current and future frequency of these debris flows. Information was collected on three temporal clusters of debris flows during which no rains or major earthquakes occurred. The thermo‐radiative conditions of each cluster were analyzed through nearby stations that cover the entire watershed altitudinal range. Snow cover was calculated using the closest satellite images before and after each cluster in order to evaluate the potential contribution of snowmelt for each. The frequency of melting‐driven debris flows, for the remainder of the 21st century, was evaluated by calculating the trends of climatic variables that control them. The results indicate that debris flows show several patterns such as: a lag of several hours between the warmest hours of the day and their triggering, occurrence in clusters of 3–5 days during the early summer, and an accelerated increase in temperature over the days previous to the beginning of the clusters. In addition, it was inferred that the water of debris flows can come from the melt of seasonal snow as well as of shallow ice within the active layer. Lastly, due to a positive trend of maximum air temperature of the warmest trimester and high inter‐annual variability of precipitation, a frequency increase is likely, followed by a possible decrease due to the negative and positive trends of precipitation and mean air temperature, respectively.

中文翻译：

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半干旱安第斯山脉活动层内季节性雪和冰融化引发的泥石流

在半干旱的安第斯山脉的冰缘地区，尚未研究过由季节性雪的迅速融化和/或活动层内的冰引起的泥石流。因此，通过有代表性的分水岭，我们研究了这些泥石流的热辐射特征，可能的水源以及当前和未来的频率。收集了关于三个时间流泥石流的信息，在此期间没有下雨或发生大地震。每个星团的热辐射条件通过覆盖整个流域海拔范围的附近站点进行了分析。使用每个群集之前和之后的最近卫星图像来计算积雪，以便评估每个融雪的潜在贡献。在21世纪剩余的时间里，由熔融物驱动的泥石流的频率 通过计算控制气候变化的趋势来评估。结果表明，泥石流表现出几种模式，例如：一天中最暖和触发之间有几小时的滞后；初夏时3-5天的簇中出现；几天中温度加速升高。在群集开始之前。另外，推断出泥石流的水可能来自活动层内的季节性积雪和浅层冰的融化。最后，由于最暖三个月最高气温的正趋势和降水的年际高变化性，频率有可能增加，然后分别由于降水和平均气温的负趋势和正趋势而有可能下降。 。