Catastrophic Debris Flow Disaster Hits Dharali Village
In News
What Happened
Why It Matters
Background
History & Context
What Changed
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BEFORE: Initial disaster reports frequently misattributed sudden high-altitude floods solely to Glacial Lake Outburst Floods (GLOFs). NOW: Rapid deployment of geomorphological satellite analysis allows authorities to accurately identify specific triggers, distinguishing shallow landslides from GLOFs.
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BEFORE: Flood monitoring predominantly relied on lower-valley river gauges that failed to detect localized upper-catchment sediment instability in time. NOW: Disaster management frameworks are increasingly incorporating the monitoring of paraglacial sediments and high-altitude slopes using advanced satellite imagery.
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BEFORE: Landslides and flash floods were often modeled and managed as isolated disaster events in mitigation planning. NOW: Authorities recognize these as cascading hazards, where extreme rainfall mobilizes glacial debris to create destructive, multi-hazard debris flows.
Prelims Angle
NCERT Connection
Practice Questions
Q1
Correct Statement(s)Which of the following statements is/are correct regarding hydro-geomorphological hazards in the Himalayas? 1. A Glacial Lake Outburst Flood (GLOF) is the exclusive natural mechanism capable of triggering massive channelized debris flows in high-altitude catchments. 2. Unconsolidated paraglacial sediments left by retreating glaciers are highly susceptible to mobilization by intense localized monsoon rainfall.