People's Liberation Army soldiers used explosives to blast the blockage that created a barrier lake on the Bailong River. After two blasts, the level of the barrier lake decreased by a meter.

??????? 堰塞湖是由火山熔巖流，冰磧物或由地震活動使山體巖石崩塌下來等原因引起山崩滑坡體等堵截山谷，河谷或河床后貯水而形成的湖泊。例：

???????The mudslides occurred at around midnight in Zhouqu County, when the residents were asleep, and a barrier lake formed on the Bailong River at around 1 a.m.

???????舟曲縣于午夜時發生泥石流，當時居民都在家中睡覺。凌晨1點左右，泥石流在白龍河上形成了一個堰塞湖。

???????又如：

???????People's Liberation Army soldiers used explosives to blast the blockage that created a barrier lake on the Bailong River. After two blasts, the level of the barrier lake decreased by a meter.

???????解放軍官兵對導致白龍江形成堰塞湖的阻塞物進行了爆破清除。經過兩次爆破，堰塞湖水位下降了一米。

—— 摘自《甘肅泥石流 1242人已獲救》

???????與此相關還有一個詞 landslide dam（堰塞壩），例：

???????Because of their rather loose nature and absence of controlled spillway, landslide dams frequently fail catastrophically and lead to downstream flooding, often with high casualties.

???????由于壩體疏松，缺少可控制的泄洪通道，堰塞壩極易潰壩并引發下游洪災，造成大量人員傷亡。

（來源：中國網學英語頻道）