Mechanism and hazards of typical glacier-lake burst in Southeastern Tibet
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Abstract:
Many glacier lakes are distributed in Tibet, China. With the passage of time, the temperature gradually raises, and some glacier lakes begin to melt. Their bursts will directly result in disastrous cascade effects and induce secondary disasters such as flood and debris flow. Therefore, it is imperative to timely carry out the study on the mechanism and hazards of glacier lake bursts. In order to better analyze the mechanism and hazard models of glacier lake bursts, we selected the Guangxiecuo glacier lake of Midui Gully in Tibet as the research object, and conducted a series of work including field investigation and sampling, indoor physical experiment, and high-resolution remote-sensing interpretation. The analysis results showed that the burst of Guangxiecuo lake was externally caused by abnormal climate and hydrological conditions and internally caused by the overflow-type and piping-type mechanisms during the burst of the terminal moraine dam. After the burst, the flood gradually transitioned to debris flow. The migration of debris flow seriously threatens the villages, roads, and cultivated land on both sides of the channel. The mechanism research can provide scientific basis for prevention and early warning of glacier lake bursts in the future.
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