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Sea Level Rise at India's Coastal Region

Sea Level Rise at India's Coastal Region

🧭 Context

The World Meteorological Organization (WMO) released its State of the Climate in Asia 2024 Report, highlighting alarming climate trends, especially in India and South Asia. The report reveals faster-than-global-average sea level rise along India’s coast, heatwaves, glacial retreat, and increasing extreme weather events.


🇮🇳 Key Climate Trends in India

🌊 Sea Level Rise (SLR)

  • Arabian Sea: Rising at 3.9 ± 0.4 mm/year

  • Bay of Bengal: Rising at 4.0 ± 0.4 mm/year

  • Global Average: ~3.4 mm/year

  • Implication: Coastal submergence risk in low-lying areas within 50 km of India’s coast (e.g., Mumbai, Chennai, Kolkata).

🏝️ Coastal Vulnerability

  • Impact: Threat to livelihoods (fisherfolk, farmers), tourism, and infrastructure.

  • Risk of Climate-Induced Migration from eastern and western coastal belts.

🏔️ Glacial Retreat

  • 23 out of 24 glaciers in Central Himalayas losing mass.

  • Increased GLOF (Glacial Lake Outburst Flood) events → downstream flooding risk.

  • Risk to hydropower plants, roads, and mountain settlements.

🌡️ Heatwaves

  • 2024: Over 450 deaths across multiple states.

  • Prolonged and extreme heat events increasing due to urban heat island effect and climate change.

Lightning Strikes

  • 1300 deaths in 2024;

  • July 10 event: 72 deaths across five states → shows growing intensity of convective weather events.


🌏 Key Climate Trends in Asia

  • Asia heating at twice the global average.

  • 2024: Second warmest year in Asia’s history.

  • Frequent disasters: Landslides, floods, and heatwaves.

  • Kerala’s Wayanad: 350+ deaths after 500 mm rainfall in 48 hours → intense cloudbursts and extreme precipitation.

  • Glacier melt in Himalayas and Tian Shan → more GLOFs, threat to regional water security.


🌡️ Causes of Sea Level Rise

FactorExplanation
Thermal ExpansionWarming oceans expand in volume
Melting of Ice SheetsGreenland, Antarctica, and global glaciers
Greenhouse Gas EmissionsCO₂ & other GHGs drive warming
Ocean Current VariabilityRegional circulation shifts redistribute ocean heat

🚨 Consequences

For India:

  • Coastal Erosion: Retreat of shorelines along both coasts.

  • Loss of Livelihoods: Impacts on fishing, agriculture, and coastal tourism.

  • Urban Infrastructure Risk: Ports, industries, homes at threat.

  • Climate Migration: Rising displacement → internal migration pressures.

For Asia:

  • Island Nations: Maldives & Pacific islands face existential threats.

  • Urban Heat Stress: Increased morbidity in cities.

  • Agricultural Disruption: Lower yields due to erratic rainfall & heat.

  • Health Impacts: Rise in heatstroke, malaria, dengue, etc.


📍 Case Study: Nepal

  • Glacier loss in Central Himalayas → Rising GLOFs.

  • Threat to hydropower, transport, and mountain communities.

  • Reflects Himalayan fragility and transboundary climate risks.


Recommended Measures

StrategyDetails
Coastal Zone ManagementBuild climate-resilient infrastructure, restore mangroves, enforce CRZ norms
Emission ReductionFast-track NDC targets, promote net-zero path
Early Warning SystemsInvest in forecasting, IMD capabilities, disaster response
International CooperationClimate finance, technology transfer under UNFCCC, Loss & Damage Fund
Community Capacity BuildingTrain local communities in adaptive farming, flood resilience, heat mitigation

📝 Value Addition for Mains (GS3 – Environment & Disaster Management)

Keywords to Use:

  • Climate Resilience

  • Climate-induced Migration

  • Urban Heat Island

  • Glacial Lake Outburst Flood (GLOF)

  • Nature-based Solutions

  • Thermal Expansion

  • Blue Economy


📌 Prelims Facts for Quick Revision

  1. Arabian Sea SLR: 3.9 mm/year

  2. Bay of Bengal SLR: 4.0 mm/year

  3. Global Average SLR: 3.4 mm/year

  4. Heatwave Deaths (India, 2024): 450+

  5. Lightning Deaths (India, 2024): 1300

  6. WMO HQ: Geneva, Switzerland

  7. Nepal’s GLOF Threat: Linked to Central Himalayan glacier loss

 

Mains-Based Questions on Sea Level Rise at India's Coastal Region

Q1. “The Indian subcontinent is increasingly vulnerable to both coastal and glacial climate risks.” Examine in the light of the WMO’s State of the Climate in Asia 2024 report.

Answer Framework:

Introduction:

  • Quote the WMO 2024 report briefly: India facing above-average sea level rise and glacial melt.

  • Define what “coastal and glacial risks” mean.

Body:

  1. Coastal Risks:

    • Faster SLR in Arabian Sea (3.9 mm/yr) and Bay of Bengal (4.0 mm/yr).

    • Risks to cities like Mumbai, Chennai, Kolkata.

    • Livelihood loss (fisherfolk, tourism), infrastructure damage, migration.

  2. Glacial Risks:

    • 23/24 glaciers in Central Himalayas retreating.

    • Rise in GLOFs → downstream flooding in Himalayan states.

    • Impacts on hydropower, mountain communities, and agriculture.

  3. Vulnerable Populations:

    • Poor urban dwellers in coastal slums.

    • Indigenous Himalayan populations.

Conclusion:

  • India must integrate coastal regulation with Himalayan environmental policies.

  • Community participation and scientific monitoring should be enhanced.

 


Q2. Discuss the multi-dimensional impact of sea level rise on India, with reference to the WMO’s 2024 report. Suggest measures to build coastal resilience.

Answer Framework:

Introduction:

  • Reference WMO’s report: India’s sea level rise is faster than global average.

  • Sea level rise = slow-onset but high-impact disaster.

Body:

  1. Impacts of SLR:

    • Erosion: Loss of land along coasts (Odisha, Kerala).

    • Livelihood: Loss of fishing/agriculture income.

    • Infrastructure Damage: Ports, refineries, SEZs at risk.

    • Migration: Influx into urban centers → urban pressure.

    • Salinization: Agricultural land & groundwater affected.

  2. Coastal Resilience Measures:

    • Mangrove restoration (e.g., Sundarbans).

    • Coastal Regulation Zones (CRZ) – strict enforcement.

    • Early warning systems, hazard zoning.

    • Sustainable tourism & development policies.

Conclusion:

  • Coastal resilience must combine ecological restoration, technological solutions, and community participation.


Q3. “Glacial retreat is no longer just an environmental concern, but a developmental challenge for India.” Elucidate.

Answer Framework:

Introduction:

  • Highlight WMO 2024: Rapid Himalayan glacier retreat.

  • Link it to water security, energy, and development.

Body:

  1. Environmental Aspects:

    • Loss of glacier mass → GLOFs.

    • Biodiversity impact in fragile Himalayan ecosystems.

  2. Developmental Challenges:

    • Hydropower at risk (e.g., Tapovan disaster, 2021).

    • Threats to transport (roads, bridges).

    • Irrigation systems fed by glacial rivers affected.

    • GLOF-induced floods damaging villages/towns.

  3. Policy & Planning Concerns:

    • Inadequate monitoring.

    • Lack of transboundary cooperation on glacier studies.

    • Poor early warning systems.

Conclusion:

  • Glacial management must become a development priority, not just a climate concern.


Q4. Heatwaves and lightning are becoming silent killers in India’s climate discourse. Analyse their growing threat and suggest mitigation strategies.

Answer Framework:

Introduction:

  • Mention 450+ deaths due to heatwaves, 1300 due to lightning in 2024 (WMO report).

Body:

  1. Growing Threat:

    • Urban heat islands amplifying heatwaves.

    • Lightning events increasing due to convection & moisture variability.

    • Poor housing and lack of awareness in rural areas.

    • Impact on elderly, outdoor workers.

  2. Impacts:

    • Health: Stroke, dehydration, vector diseases.

    • Economy: Loss of productivity, damage to crops/electric infrastructure.

    • Inequity: Marginalized communities hit hardest.

  3. Mitigation Strategies:

    • City-level Heat Action Plans (e.g., Ahmedabad model).

    • Early warning systems for lightning (e.g., DAMINI app).

    • Passive cooling architecture in rural housing.

    • Tree cover and green spaces.

Conclusion:

  • Silent climate risks must be integrated into disaster planning and national climate missions.


🖋️ Essay Paper


Q5. “The geography of climate risk is shifting fast – from ice to ocean, and cities to villages.” Critically analyse in the context of Asia’s climate challenges.

Answer Framework:

Introduction:

  • Reflect on how WMO’s report paints a dynamic picture of climate risk across ecosystems.

Body:

  • From Glaciers:

    • Melting glaciers causing floods → mountain insecurity.

  • To Oceans:

    • SLR displacing millions, affecting mega cities and islands.

  • From Urban:

    • Cities face heatwaves, infrastructure burden.

  • To Rural:

    • Farmers face erratic rainfall, drought, lightning strikes.

Conclusion:

  • Climate is not just a future problem; it’s a here-and-now geography of inequity, requiring resilient and decentralized solutions.

Prelims Questions based on Sea Level Rise at India's Coastal Region

Sea Level Rise at India's coastal regions

1 / 8

Which of the following best describes the term urban heat island?

2 / 8

The “Blue Economy” approach, often suggested for coastal resilience in India, includes which of the following components?

  1. Sustainable marine fisheries

  2. Ocean-based renewable energy

  3. Oil and gas exploitation

  4. Marine biodiversity conservation

  5. Coastal tourism development

3 / 8

Which of the following are correctly matched pairs related to climate change impacts?

Phenomenon Impact Area
Heatwaves Urban mortality increase
Glacial melt Flood risk in Himalayas
Lightning Rural livelihood threats
Sea level rise Inland desertification

4 / 8

Which of the following Indian sectors are most immediately impacted by sea level rise?

  1. Fishing

  2. Port-based industries

  3. Alpine horticulture

  4. Coastal agriculture

  5. Urban real estate

5 / 8

Which of the following are major factors contributing to global sea level rise?

  1. Tectonic uplift of continental shelves

  2. Thermal expansion of ocean water

  3. Melting of polar ice sheets

  4. Variability in ocean currents

6 / 8

With reference to the WMO’s 2024 report, consider the following events:

  1. Increased Glacial Lake Outburst Floods in Nepal

  2. Lightning deaths exceeding 1000 in India

  3. Kerala's Wayanad landslide after extreme rainfall

  4. Asia experiencing the coldest year in a decade

Which of the above are correctly reported?

7 / 8

Which of the following correctly explains the term GLOF, often mentioned in climate-related reports?

8 / 8

Consider the following statements about Sea Level Rise (SLR) in India:

  1. The Arabian Sea is rising at a rate higher than the global average.

  2. The Bay of Bengal is rising faster than the Arabian Sea.

  3. India's eastern coast is less vulnerable to sea level rise than the western coast.

Which of the statements given above is/are correct?

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