What Nepal's floods reveal about “cascading hazards”
The Nepal disaster appears to be a “cascading event,” where one hazard seems to have triggered another, experts say
What Nepal's floods reveal about "cascading hazards" A catastrophic flash flood has struck northern Nepal, claiming at least 157 lives and leaving hundreds missing, including at least 34 Australians. The disaster may be an example of "cascading hazards," where one hazard triggers a series of subsequent events, often resulting in a larger disaster.
Early evidence suggests that the floods were triggered by a massive glacial collapse high in the Himalayas, which produced an enormous ice-rock avalanche. This avalanche blocked the river, temporarily storing water, and when it failed, it sent a sudden surge downstream, causing the flood. The disaster highlights the difficulty in anticipating, preparing for, and surviving cascading events.
These hazardous chains can amplify as they progress, transforming an initial trigger into a more destructive hazard affecting people far away. Understanding how individual hazards can trigger or amplify another is crucial for effective disaster risk management.
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