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.

        堰塞湖是由火山熔岩流，冰碛物或由地震活动使山体岩石崩塌下来等原因引起山崩滑坡体等堵截山谷，河谷或河床后贮水而形成的湖泊。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.

       舟曲县于午夜时发生泥石流，当时居民都在家中睡觉。凌晨1点左右，泥石流在白龙河上形成了一个堰塞湖。

       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.

       解放军官兵对导致白龙江形成堰塞湖的阻塞物进行了爆破清除。经过两次爆破，堰塞湖水位下降了一米。

—— 摘自《甘肃泥石流 1242人已获救》

       与此相关还有一个词 landslide dam（堰塞坝），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.

       由于坝体疏松，缺少可控制的泄洪通道，堰塞坝极易溃坝并引发下游洪灾，造成大量人员伤亡。

（来源：中国网学英语频道）