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Himalayan Slurry Floods: A New Disaster Looms
3 Sep
Summary
- Disasters mix water, ice, and massive sediment into destructive slurry.
- Climate change intensifies extreme rainfall and high-mountain hazards.
- India faces growing exposure to these hazardous Himalayan events.
Experts are highlighting a new type of disaster emerging from the Himalayas, distinct from typical water-based floods. These catastrophic events involve a dangerous combination of water, ice, and enormous quantities of sediment, resulting in a high-energy slurry that can obliterate everything in its path.
Recent events, such as the 2021 Chamoli disaster in India and a significant event in Nepal, exemplify this threat. The Nepal incident was estimated to be five to ten times larger than previous similar occurrences. These are not merely hydrological floods but complex geological and hydrological phenomena exacerbated by a changing climate.
Climate change is identified as a major driver, leading to intensifying extreme rainfall and faster warming in the high mountains. This degradation of permafrost is expected to increase glacial lake outbursts and rock-ice avalanches, producing debris-laden floods that are harder to predict. These accumulating hazards, including increased landslides and sediment in rivers, are raising riverbeds and reducing channel capacity across the region, posing a considerable threat to India.
