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The threat of Glacial Lake Outburst Floods (GLOF) is yawning. It is significantly influenced by rising global temperatures and environmental changes. GLOFs pose severe risks to life and property. Melting glaciers exacerbate these risks. They form unstable moraines that can breach due to cloudbursts or seismic activities. Historical instances highlight the dangers posed by anthropogenic actions. These include the 2013 Kedarnath disaster and the recent flooding of Lhonak Lake in Sikkim. Actions like deforestation and pollution are significant contributors. The National Glacial Lake Risk Management Project aims to track and mitigate these risks. It enhances early detection and scientific capacities. This project emphasises the need for sustainable environmental practices.
Table of contents
Key Takeaways
- Glacial Lake Outburst Floods (GLOF) threaten life and property, driven by global temperature rise and environmental changes.
- Historical events, like the Kedarnath disaster and Lhonak Lake flooding, showcase the dangers posed by GLOF.
- The National Glacial Lake Risk Management Project aims to track GLOF risks and enhance early detection.
- Human activities, like deforestation and pollution, significantly contribute to GLOF occurrences.
- Understanding and mitigating anthropogenic impacts are crucial for controlling future GLOF events.
Environmental degradation
Increasing pollution and environmental degradation are precarious problems. The increasing global temperature causes the melting of glaciers. The melting results in an increasing surface area of glacial lakes. The environmental degradation is progressively rising. The world faces a disturbed weather cycle and harsh weather. Additionally, there are devastating floods and excessive snowfall. The increasing pollution of rivers, lakes, soil, and air is also contributing to a polluted environment. The collective effect is showing its effect. The ferocious one of all is GLOF.
Glacial Lake Outburst Flood (GLOF)
The global temperature rise has many side effects. One critical effect of rising global temperatures is GLOF. An acronym that stands for Glacial Lake Outburst Flood.
(1) Precarious
GLOF is a serious danger to life and property. As a result of glacial movement, craters are formed. Water-filled craters form lakes. These lakes get their water from melting glaciers. Temperature rise adds to the speed of glacial melting. While melting, glaciers leave moraine, which accumulates in the form of an unstratified lump, ice, or both. The lake swells due to water accumulation, increasing its surface area. Anthropogenic hazards put extra pressure on Nature breaching moraines and snow dams. The results are destructive floods.
(2) Kedarnath 2013
Heavy torrential rain caused the Chorbari lake (Gandhi Sarovar) overflow and cause a catastrophe at Kedarnath in 2013. The cloudburst resulted in torrential rain. 300 mm of rain was recorded in 24 hour time. It was over 400 per cent more than normal. The excessive rain caused the Chorabari lake to brim. This resulted in a flood. Thousands of people were affected. The area was inundated with a few feet of thick slush and debris.
(3) Sikkim 2023
Lhonak Lake of Sikkim burst in October 2023, flooding the Teesta River. The lake breached the boundary, causing immense damage to life and properties, dams, and hydroelectric projects. All were swept in the flash floods. Incidents of cloudbursts and flashfloods are increasing.
(4) Uttarakhand 2025
Flashflood of Dharali, Uttarkashi and Dehradoon in Uttarakhand in 2025 are harrowing. It is because of the Glacial Lake Overflow Flood. Logically, water needs a passage for its flow. Progressively melting glaciers add water, causing an increase in water volume in the already filled lakes. Cloudburst and seismic activities trigger the breaching process. They weaken the moraine bunds and thus break them. This causes the release of immense water with a great force that sweeps everything in its way.
Central Water Commission
The Central Water Commission published a report. It highlights that the surface area of Himalayan Glacial lakes and water bodies has increased significantly. Total inventary area of glacial lakes across the Himalayan region has increased by 10.81%, while in India alone, the surface area of glacial lakes has increased by 33.7 per cent. This change occurred between 2011 and 2024. This attracted eyeballs. Recent incidents of horrendous flashfloods and widespread destruction raised concern. (The Economic Times)
What is the reason behind it? Let us try to understand it in a little detail.
Cloud burst
Before proceeding further, it is necessary to understand cloudburst. As the term indicates, it is like bursting a huge water-filled balloon. As it bursts, the water contained in the balloon suddenly falls in a localised area.
(1) How it happens
The warm air containing moisture moves and starts rising up by orographic lift. They collide with natural barriers like mountains and move upward along the slope of the mountain. At its height, it quickly cools down and condenses into water droplets. The clouds accumulate more moisture than their holding capacity. The water-laden clouds rain torrentially on the given location, releasing more than 100 mm of rain in 24 hours. It is because of the similarity with the balloon cited above that it is called a cloudburst.
(2) Natural barriers
The cloudburst is frequent in areas with natural barriers like mountains or forests. Rising temperatures due to human activities lead to frequent cloudbursts in hilly areas. The increasing rate of surface evaporation also contributes to this phenomenon. It is also seen in hot, dirty, and moist plains. The contributing factors cause warm air to become moisture-laden and condensed at a height, resulting in a heavy downpour. The release of a large amount of water in a localised area is destructive and cause landslide, Gulley erosion. It inundated a large area in no time. It gives no time for preparation.
(3) Contributing factors
Many factors contribute to the process of GLOF. It is slow and infrequent in natural conditions. Undue human interference with natural cycles causes disruption and augments temperature increase. It starts a chain reaction leading to catastrophic conditions.
ecological balance
Indiscriminate tree felling denudes the Earth’s surface. This results in surface runoff and exposes the Earth to wear. Topsoil gets eroded, and the area loses its cloud-holding capacity. It increased the atmospheric temperature. Additionally, the temperature rise intensifies due to greenhouse gas emissions from automobiles. Unplanned urbanisation and rapidly shrinking farmland put pressure on forests. It causes habitat destruction and disturbed ecological balance. The effect of rising temperatures is showing its effects widely.
Fast-melting glaciers and their movements create large craters that hold water and till. The accumulated water and moraine become disastrous. This happens when breaches occur. They cause large-scale destruction in the form of Glacial Lake Outburst Flood.
Natural causes
Natural causes include ice avalanches, rainfall, and earthquakes. Nevertheless, human-induced imbalances, known as anthropogenic hazards, are more important and significant contributory factors. Haphazard urbanisation and irregular town planning contribute to the global temperature rise. Excessive vehicular pollution adds to this issue. Large-scale tree felling without replanting trees further exacerbates the problem. It causes air to become warm and light. As moisture condenses, precipitation occurs. It falls heavily, overfilling and spilling the already brimming glacial lakes, causing the seams. The gush of water carries detritus and boulders with it downstream. It causes heavy loss.
Government efforts
A Glacial Lake Outburst Flood (GLOF) is difficult to predict and check. Various precautionary measures have been taken by the government to mitigate the adverse effects of GLOF. The government established the NGRMP (National Glacial Lake Risk Management Project) in four states of the country. They are Arunachal Pradesh, Himachal Pradesh, Sikkim and Uttarakhand. The goal of the Project includes early detection of the problem, warning and monitoring. strengthening scientific capabilities. Above all, the prevention of economic loss and damage is the most important.
In the end
Apart from the effective measures to mitigate the ill effects of GLOF, it is essential to watch the environmental causes. Human-induced factors must also be monitored to effectively control future events.
Further reads:
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Kamal Kishore Srivastava
A retired government officer turned writer and photographer, Kamal Kishore Srivastava is a regular blogger and essayist who explores life’s deeper meanings through immersive reflections on nature, impermanence, and happiness. On his blog Nature’s Narrative, he blends philosophical storytelling with practical insights. Writing 1200–1500 or more words regularly, Kamal is committed to refining his craft, expanding his audience, and building a sustainable space where thought and feeling meet.
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