Investigation to the upstream of the gully and analysis of the climate data demonstrate that these two debris flows were caused by glacial meltwater and moraine-dammed lake outburst.

• 通过对上游的考察和气象资料分析，查清了灾害的形成原因是冲堆普上游冰川融水和嘉龙湖局部溃决所诱发。