泥石流(Mud-and-stone flow、mud and rock flow或mud-rock flow),亦称土石流(德语:Murgang)或泥流(Mud flow),是指在山區或者其他沟谷深壑,地形险峻的地区,因为暴雨、雪暴或其他自然灾害引发,為泥土、石頭等與大量的水混合後,受重力作用,沿著斜坡或山溝滑動的現象。
Debris flows are geological phenomena in which water-laden masses of soil and fragmented rock rush down mountainsides, funnel into stream channels, entrain objects in their paths, and form thick, muddy deposits on valley floors.
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