Himalayan floods highlight urgent need for regional disaster preparedness: Safi Ahsan Rizvi
2-minute summary
Recent catastrophic Himalayan floods in Nepal, triggered by a complex rock-ice avalanche rather than a conventional Glacial Lake Outburst Flood (GLOF), have underscored the urgent necessity for robust regional disaster preparedness and real-time data-sharing among South Asian nations. Former NDMA advisor Safi Ahsan Rizvi emphasized that transboundary disaster management must be treated as a shared regional public good rather than a diplomatic favor. Climate change is accelerating glacial melt, expanding high-risk glacial lakes, and increasing the frequency of extreme weather events across the fragile Himalayan ecosystem. While India has established national programmes for GLOF risk reduction and landslide mitigation—such as identifying high-risk locations and planning engineering interventions—the high-altitude terrain presents severe logistical challenges. Experts advocate for the deployment of advanced early-warning systems, satellite-based interferometric studies to monitor slope stability, and collaborative cross-border institutional mechanisms to protect downstream vulnerable populations from escalating climate-induced geohazards.
Why it's in the news
Following devastating flash floods along the Trishuli River in Nepal, disaster risk analysts and former National Disaster Management Authority (NDMA) officials have highlighted the transboundary threat of Himalayan geohazards, calling for an immediate regional data-sharing mechanism to mitigate Glacial Lake Outburst Floods (GLOFs) and rock-ice avalanches.
Facts to remember
- Recent catastrophic Himalayan floods in Nepal were triggered by a complex rock-ice avalanche rather than a conventional Glacial Lake Outburst Flood.
- Safi Ahsan Rizvi is a former National Disaster Management Authority advisor.
- The International Centre for Integrated Mountain Development serves eight regional member countries of the Hindu Kush Himalaya.
- The National Disaster Mitigation Fund provides financial backing and strategic frameworks for structural and non-structural mitigation measures.
Background and context
The Himalayan mountain system is geologically young, highly unstable, and increasingly vulnerable to anthropogenic climate change, which drives rapid glacier retreat. Over recent decades, the formation of supraglacial and moraine-dammed lakes has escalated significantly. When these fragile natural dams fail due to triggers like heavy rainfall, earthquakes, or rock-ice avalanches, they cause catastrophic Glacial Lake Outburst Floods (GLOFs), endangering millions of people living in downstream river basins across India, Nepal, Bhutan, and Pakistan. The 2023 South Lhonak lake outburst in Sikkim highlighted India's exposure to such transboundary and high-altitude mountain hazards. In response, India has initiated targeted national mitigation frameworks under the NDMA, focusing on hazard zonation, installation of Automated Weather Stations (AWS), early-warning systems, and structural interventions such as controlled siphoning of expanding glacial lakes.
Government schemes
- National Disaster Mitigation Fund (NDMF) — Provides financial backing and strategic frameworks for structural and non-structural mitigation measures against localized and regional natural disasters.
International organisations
- International Centre for Integrated Mountain Development (ICIMOD) — Regional intergovernmental learning and knowledge sharing center serving eight regional member countries of the Hindu Kush Himalaya, playing a crucial role in monitoring glacial lakes and transboundary flood alerts.
Previous UPSC questions on this theme
- Mains GS-1 2021 — Differentiate the causes of landslides in the Himalayan region and Western Ghats.
Mains practice: Climate change is converting the fragile Himalayan ecosystem into a zone of high-frequency geohazards. Examine the causes of Glacial Lake Outburst Floods (GLOFs) and rock-ice avalanches, and evaluate India's preparedness in mitigating these risks.
The Himalayas, being young and tectonically active fold mountains, are increasingly experiencing extreme climate-induced geohazards such as Glacial Lake Outburst Floods (GLOFs) and rock-ice avalanches. Recent disasters in Nepal and Sikkim underscore the escalating vulnerability of downstream regions to rapid cryospheric changes.
Causes of Himalayan Cryospheric Disasters:
• Accelerated Glacier Melt: Global warming causes rapid retreat of Himalayan glaciers, leading to the accumulation of vast meltwater volumes held precariously behind weak moraine dams.
• Rock-Ice Failures: Rising temperatures thaw permafrost, destabilizing steep rock faces and triggering massive rock-ice avalanches that crash into lakes or valleys.
• Extreme Precipitation: Unprecedented cloudbursts and intense rainfall events exacerbate slope instability and trigger rapid runoff.
Evaluation of India's Preparedness:
• Shift toward Mitigation: Under the National Disaster Management Authority (NDMA), India has developed specific national guidelines for GLOF risk reduction, moving from a post-disaster relief paradigm to proactive mitigation.
• Early Warning Systems: Installation of Automated Weather Stations (AWS) and sensor networks in high-altitude zones like Sikkim to provide advance alerts.
• Challenges in Implementation: Extreme high-altitude terrain (above 5,000 meters) restricts construction windows to a few months, and specialized logistical equipment is often lacking.
• Absence of Transboundary Data Sharing: Cryospheric hazards originate upstream in neighbouring sovereign nations; lack of real-time hydro-meteorological data sharing hinders accurate downstream forecasting.
Conclusion:
Mitigating Himalayan geohazards requires a paradigm shift treating transboundary river basins as a shared ecological unit. Strengthening regional data networks via platforms like ICIMOD, integrating satellite-based interferometry for slope monitoring, and engineering interventions are vital for sustainable disaster resilience.
Prelims practice questions
Q1. With reference to disaster management in India, which of the following institutions operates as the apex statutory body for laying down policies and guidelines for disaster management?
- NITI Aayog
- National Crisis Management Committee (NCMC)
- Central Water Commission (CWC)
- National Disaster Management Authority (NDMA)
Answer: D. The National Disaster Management Authority (NDMA), headed by the Prime Minister of India, is the apex statutory body mandated under the Disaster Management Act, 2005, to lay down policies, plans, and guidelines for disaster management.
Q2. The term 'Glacial Lake Outburst Flood' (GLOF) frequently appears in news in the context of which of the following mountain ecosystems?
- Aravalli hill ranges
- Vindhya and Satpura ranges
- Western Ghats and Eastern Ghats
- Himalayas and Hindu Kush region
Answer: D. GLOFs are primarily associated with high-altitude glaciated mountain systems such as the Himalayas and the Hindu Kush region, where rapid climate warming is causing widespread glacial retreat and lake expansion.
Revision flashcards
- What is a GLOF? A Glacial Lake Outburst Flood (GLOF) is a sudden release of a vast volume of water held in a glacial lake, typically caused by the failure of a fragile moraine dam or ice barrier.
- What primary trigger caused the recent catastrophic floods in Nepal as highlighted by disaster analysts? A rock-ice avalanche, where a destabilized rock face collapsed and brought glacier ice and debris down steep slopes.
- Which statutory body in India formulates national guidelines for GLOF risk reduction? The National Disaster Management Authority (NDMA) under the Ministry of Home Affairs.
- What regional intergovernmental body monitors Hindu Kush Himalayan cryospheric changes and hazards? The International Centre for Integrated Mountain Development (ICIMOD).
- Why is high-altitude disaster mitigation in the Himalayas logistically challenging? Because high-risk glacial lakes are situated at extreme elevations (around 5,000 meters) where fieldwork is restricted to a few months annually and requires specialized equipment.