Paper: GS – I, Subject: Geography, Topic: Change in Geography Features, Issue: ISRO Study on Himalayan Glacier Hazards.
Context:
A study by scientists from the Indian Space Research Organisation (ISRO) analysing the August 2025 flash flood in Dharali village, Uttarakhand found that exposed ice patches on glaciers are early warning signs of glacier instability and possible floods. Satellite images of the Srikanta Glacier showed exposed ice patches just before the disaster, indicating rapid deglaciation and cryospheric instability.
Key Takeaways:
Key Idea of the Article:
- Melting glaciers are not only dangerous because of glacial lake outburst floods (GLOFs).
- The study shows that smaller instabilities like collapsing ice patches on glaciers can also trigger deadly downstream floods.
What are Ice Patches on Glaciers?
- Exposed ice patches appear when seasonal snow cover and firn layers thin due to warming.
- Normally Snow cover acts as an insulating protective layer over glacier ice.
- But when warming reduces this layer: The bare glacier ice becomes unstable and more vulnerable to collapse.
Implications and Takeaway:
- Himalayan cryospheric hazards may be more widespread than previously understood, as glacier instability can occur beyond glacial lakes.
- Exposed ice patches and nivation zones can act as early indicators of glacier weakening and potential floods.
- Satellite monitoring and early-warning systems are therefore essential for identifying hidden instability zones and reducing disaster risks in Himalayan regions.
Source: (The Hindu)
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