Satellite Observations Show Rapid Expansion Of Glacial Lakes In Indian Himalayas
The Indian Himalayan Region (IHR) is witnessing a rapid expansion of glacial lakes due to accelerated glacier retreat driven by climate change. According to satellite-based observations released by ISRO, hundreds of glacial lakes across the Himalayas have expanded significantly between 1984 and 2023.The Himalayas, often called the “Third Pole”, contain vast reserves of snow and glaciers and act as a major freshwater source for rivers such as the:
However, increasing glacial melting is creating new risks in the form of:
The Himalayas are referred to as the Third Pole because:
The Himalayan cryosphere plays a critical role in:
| Parameter | Findings |
|---|---|
| Study Period | 1984–2023 |
| Glacial lakes identified (>10 ha) | 2,431 |
| Lakes significantly expanded | 676 |
| Lakes located within India | 130 |
| Major basin distribution | Indus, Ganga, Brahmaputra |
| River Basin | Number of Lakes |
|---|---|
| Indus Basin | 65 |
| Ganga Basin | 7 |
| Brahmaputra Basin | 58 |
The highest concentration of expanding lakes was observed in the Indus and Brahmaputra basins.
| Expansion Level | Number of Lakes |
|---|---|
| Expanded more than twice | 601 |
| Expanded 1.5–2 times | 10 |
| Expanded around 1.5 times | 65 |
The data indicates rapid glacier retreat and accelerated meltwater accumulation.
| Elevation Range | Number of Lakes |
|---|---|
| 4,000–5,000 metres | 314 |
| Above 5,000 metres | 296 |
Most expanding lakes are located at very high altitudes where field monitoring is difficult.
8Glacial lakes are classified based on their formation process.
| Type | Characteristics |
|---|---|
| Moraine-Dammed Lakes | Water blocked by loose moraine debris |
| Ice-Dammed Lakes | Water blocked by ice barriers |
| Erosion Lakes | Formed in depressions created by glacial erosion |
| Other Glacial Lakes | Miscellaneous formation mechanisms |
Among the 676 expanding lakes:
| Type | Number |
|---|---|
| Moraine-Dammed | 307 |
| Erosion Lakes | 265 |
| Other Lakes | 96 |
| Ice-Dammed | 8 |
Moraine-dammed lakes are particularly dangerous because their natural dams are weak and unstable.
| Parameter | Data |
|---|---|
| Area in 1989 | 36.49 hectares |
| Area in 2022 | 101.30 hectares |
| Increase | 178% |
| Annual Expansion Rate | 1.96 hectares/year |
The Ghepang Ghat lake exemplifies rapid Himalayan glacial transformation.
A GLOF occurs when a glacial lake suddenly releases large quantities of water due to failure of its natural dam.
Potential impacts include:
The study reinforces evidence that:
Major contributing factors include:
Satellite remote sensing is critical because Himalayan terrain is:
The study used satellite archives spanning nearly four decades.
Long-term monitoring helps in:
It also assists governments in:
The growing number of expanding lakes highlights the need for:
India has increasingly focused on glacial lake risk management after major Himalayan disasters.
Glacial melt directly influences:
The Himalayan region is ecologically and geopolitically sensitive because it includes:
| Feature | Details |
|---|---|
| Full Form | Indian Space Research Organisation |
| Established | 1969 |
| Headquarters | Bengaluru |
| Function | Space research, satellite applications and remote sensing |
| Feature | Details |
|---|---|
| Importance | Source region of major Himalayan rivers |
| Ecological Role | Major cryosphere and freshwater reserve |
| Feature | Details |
|---|---|
| Full Form | Glacial Lake Outburst Flood |
| Nature | Sudden release of glacial lake water |
| Feature | Details |
|---|---|
| Function | Earth observation and environmental monitoring |
Updated – 22 April 2024 | ISRONews Source: ISRO