Glacial Lake Outburst Flood Mitigation Strategies in Himalayas
Source:The Hindu ↗
ఇది ఎందుకు ముఖ్యం
Glacial Lake Outburst Floods (GLOFs) represent a critical and growing transboundary climate risk in the Himalayan region, directly relevant to India's disaster management strategy, environmental security, and regional cooperation for climate resilience.
సారాంశం
Nepal has unveiled plans to artificially lower and drain water from four high-risk glacial lakes to prevent potential Glacial Lake Outburst Floods (GLOFs), following recent deadly flash floods. Accelerated global warming in the Himalayas has led to rapid glacial melting, making proactive measures like artificial drainage essential for downstream disaster mitigation and protecting vulnerable communities in Nepal and the wider Himalayan region.
ముఖ్య అంశాలు
- Nepal has announced plans to drain water from four vulnerable glacial lakes to avert catastrophic Glacial Lake Outburst Floods (GLOFs).
- The decision follows deadly flash floods and climate-induced disasters that underscored the rising risks to downstream human settlements and infrastructure.
- Himalayan glacial melting has accelerated due to global warming, increasing the frequency and severity of GLOF events across the region.
- Proactive disaster mitigation strategies, such as lowering lake water levels, represent a crucial shift from reactive disaster response to proactive risk reduction.
ముఖ్యమైన పదాలు
Glacial Lake Outburst Flood (GLOF)
A sudden release of a large volume of water contained by a glacial lake, caused by the breaching of its natural moraine dam due to avalanches, earthquakes, or rapid melting.
UPSC context
GS Paper III (Disaster Management, Climate Change). Tests understanding of extreme weather events, glacial retreat risks, and mitigation strategies in the Himalayas.
International Centre for Integrated Mountain Development (ICIMOD)
An intergovernmental learning and knowledge-sharing center serving the eight regional member countries of the Hindu Kush Himalaya, focusing on environmental degradation and climate resilience.
UPSC context
GS Paper III (Environment and Ecology). Relevant for regional institutional frameworks, Himalayan ecosystem monitoring, and climate adaptation policies.
Green Climate Fund (GCF)
A multilateral fund established to assist developing countries in adaptation and mitigation practices to counter climate change, supporting large-scale projects like glacial lake drainage.
UPSC context
GS Paper III (Environment, International Climate Finance). Tests knowledge of global climate financing mechanisms for vulnerable developing nations.
ప్రిలిమ్స్ ఉచ్చు
Glacial Lake Outburst Floods are triggered exclusively by heavy monsoon rainfall overflowing high-altitude lakes.
GLOFs are primarily triggered by physical events like avalanches, earthquakes, or hydrostatic pressure breaching unstable moraine walls, not merely by the direct overflow of rainwater during standard monsoons.
అనుసంధానమైన స్థిర భావనలు
What causes Glacial Lake Outburst Floods (GLOFs) and how are moraine-dammed lakes formed in the Himalayas?
- Moraine Formation: Glacial retreat leaves behind loose debris (moraines) that acts as a natural dam, impounding meltwater to form unstable glacial lakes.
- Trigger Events: Triggers include ice avalanches, rockfalls, earthquakes, or hydrostatic pressure breaching the fragile moraine barrier, causing catastrophic downstream flooding.
- Climate Amplification: The Hindu Kush Himalayan region warms at twice the global average, drastically accelerating the formation and expansion of these high-risk lakes.
అంతర-అంశ నమూనాలు
Himalayan GLOFs and Transboundary River Governance
Rapid warming in the Hindu Kush Himalayas highlights transboundary river governance challenges and the need for joint early warning systems between India and upper riparian states.
Climate Adaptation vs. Sendai Framework Targets
Mitigating climate-induced disasters in fragile mountain ecosystems links Sendai Framework targets on risk reduction with domestic disaster management funding allocation.
GLOF mechanics, moraine dam failure, and Hindu Kush Himalayan warming rates are ripe for a multi-statement Prelims ecology question.
అనుసంధాన PYQలు · 2
అనుసంధాన PYQలు · 2
- 2024MainsGS3
Flooding in urban areas is an emerging climate-induced disaster. Discuss the causes of this disaster. Mention the features of two such major floods in the last two decades in India. Describe the policies and frameworks in India that aim at tackling such floods.
- 2020MainsGS3
Discuss the recent measures initiated in disaster management by the Government of India departing from the earlier reactive approach.
