GS1 · 15 marks · 250 words

With accelerating glacial melt in the Himalayas, GLOFs pose a severe hazard downstream. Analyse the causes, impacts, and mitigation strategies related to GLOFs in India.

Answered by 3 toppers · CSE 2025

Syllabus: Geographical features and their location-changes in critical geographical features (including water-bodies and ice-caps) and in flora and fauna and the effects of such changes.

How toppers approached it

From 2 of the 3 answers · about 300 words · 50% drew a diagram.

Opening

  • A figure1 of 2
  • A date or context1 of 2

Body

  • Points and prose1 of 2
  • Points1 of 2

Close

  • No separate close1 of 2
  • A way forward1 of 2

The toppers’ answers

Raghav JhunjhunwalaAIR 4 · CSE 2025 · 242 wordsTheir whole copy

Opening · a figure

As per IPCC; Hindu Kush Glaciers to lose 2/3rd of volume by 2100 even if Paris climate goals are met in best case; exacerbating GLOFs threat.

GLOF Formation

Body · points and prose

→ Unconsolidated Himalayan sediments deposit into depression and accumulate melting glacier meltwater of glaciers

Diagram
Horn / \ / \ Eskers/ Arete \ Drumlins \ Glacial lake Tarn lake Fig: Glacial Ecosystem

I) Causes of Rising GLOFS (1) Increased global warming (Already +1.7°C from Industrial Revn - IPCC) (2) Enhances glacier melting due to increased [latent heat] (3) Rise of [heatwaves] and expanse felt until Himalayas.

(4) Black soot deposition over Himalayas and reduced Albedo (Feedback loop -ve)

(5) Tectonic Instability of Himalayas 5.1 sedimentary origin & unconsolidated. 5.2 Active collision of Indian & Eurasian plates. 5.3 Active suture zones.

II) Impacts of GLOFs (1) Heavy Economic losses. Ex: Teesta Dam (Sikkim) destroyed in seconds. (2) Loss of Hydel Energy potential (Threat to 2070/Net zero target) (3) Flash floods and damage to population and property. (4) Fuels landslide and Earthquake in response (mass movement) (5) Threat to integrity of Himalayan Ecosystem stability (6) Ill impacts on local tribes & communities Ex: Bhutia, Lepcha.

III) Mitigation Strategies for GLOFs: (1) Paris objectives (< 2°C rise target) India's commitments 1.1 50% Renewable Capacity 1.2 45% Reduction @ carbon Intensity, etc. (2) Structural Initiatives 2.1 soil nailing 2.2 Hydroseeding 2.3 Retention walls, etc. (being proposed) (3) nonstructural measures 3.1 mandatory EIA before projects (Mistra committee) 3.2 Zonation mapping, etc.

Close · a way forward

Thus; urgent need to follow NDMA guidelines and strive to balance Himalayan fragility with Ecosystem approach.

More on Himalayas

Himalayan physiography, ecology and the pressures on mountain systems.

All GS1 questions on Himalayas