Hanging Glacier Collapse in Focus, NDMA for Hard Look to Reduce Future Risks, Pg1

Key Highlights:

• A hanging glacier collapse is identified as the likely trigger for a devastating flash flood in Nepal.
• The National Disaster Management Authority (NDMA) plans a comprehensive study on the Nepal incident due to similar vulnerabilities in India.
• India has experienced several major flash flood incidents, including the Kedarnath tragedy (2013), Chamoli disaster (2021), and Sikkim lake burst (2023).
• The NDMA initiated the National GLOF Risk Management Programme to mitigate risks from glacial lake outburst floods.
• ISRO reported that 676 glacial lakes in the Indian Himalayan river basins expanded significantly between 1984 and 2023.
• The US Geological Services initially reported an earthquake but later revised its assessment, attributing the seismic signal to the glacial collapse and debris flow.

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Detailed Insights:

• The Nepal flash flood highlights the vulnerability of Himalayan regions to similar disasters, reinforcing the need for robust disaster management strategies.
• The National GLOF Risk Management Programme aims to strengthen glacial lake boundaries and install early warning systems in Arunachal Pradesh, Sikkim, Uttarakhand, Himachal Pradesh, Jammu & Kashmir, and Ladakh.
• Glaciologist Anil Kulkarni of the Indian Institute of Science described the glacier collapse as generating immense energy, akin to a high-intensity bomb blast.
• Satellite images from the National Remote Sensing Centre confirmed the collapse of a glacier mass and the subsequent swelling of the Bhote Koshi river.
• The incident underscores the importance of continuous monitoring of glacial lakes and developing capabilities for landslide forecasting and early warning systems.
• The revised assessment by the US Geological Services indicates the seismic signal was generated by the glacial collapse itself, rather than an earthquake triggering it.

Scientific/Technical Concepts Involved:

• Hanging Glacier: A glacier that terminates abruptly on a steep slope, often leading to icefalls or avalanches.
• Glacial Lake Outburst Flood (GLOF): A sudden release of water from a glacial lake due to the failure of its natural dam.
• Moraine: Accumulations of unconsolidated glacial debris (soil and rock) that have been transported and deposited by a glacier.
• Early Warning Systems: Technologies and procedures designed to detect hazards and disseminate timely alerts to enable preparedness and response.