Expanding Himalayan Glacial Lakes Pose Flood Risks to Downstream Communities
• Researchers have identified a significant increase in the size and number of glacial lakes in the Alaknanda River basin in the western Himalayas, driven by melting glaciers. Using satellite imagery from Landsat and Sentinel-2, they tracked changes in 74 glacial lakes between 1994 and
• The surface area of 24 lakes larger than 0.01 km² expanded by 67%, growing from 0.97 km² to 1.62 km². Additionally, 57 new glacial lakes were identified, bringing the total to
Impact & Risks
The expansion of glacial lakes in the Himalayas poses a serious risk to downstream communities due to the potential for Glacial Lake Outburst Floods (GLOFs). These floods can release large volumes of water suddenly, carrying mud and debris with destructive force. The recent flood in Nepal, while not a classic GLOF, underscores the dangers of high-altitude flooding. The interaction of extreme rainfall, expanding lakes, slope instability, and seismic activity could amplify risks, threatening lives, infrastructure, and ecosystems in the region.
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