Why In News?

A comprehensive shoreline change assessment (1990–2022) by the National Centre for Coastal Research (NCCR) found that 28.3% of Odisha's coastline is under erosion, while 54.1% is witnessing accretion and 17.6% remains stable.

What Is Coastal Erosion?

  • Coastal erosion means the progressive loss of land along a shoreline due to wave action, currents, and tides.

  • It involves shoreline retreat, where the land-sea boundary moves inland over time.

  • Sediment loss occurs when sand and material are removed faster than they are replenished.

  • Some erosion follows natural coastal processes, such as wave energy and longshore currents.

  • Much of today's erosion also reflects human-induced coastal change, including port construction, sand mining, and embankments.

Why Is Odisha Vulnerable to Coastal Erosion?

  • Odisha has a long coastline of 564 km, exposing it to extensive erosion risk across multiple districts.

  • The state faces a disproportionate share of India's cyclones, given its location on the Bay of Bengal.

  • Sea-level rise, linked to global warming, is gradually submerging low-lying coastal stretches.

  • High wave energy along parts of the coast accelerates sediment removal.

  • Storm surges during cyclones cause sudden, severe erosion episodes.

  • River sediment changes, partly from upstream dams and embankments, reduce the natural sediment supply that would otherwise replenish beaches.

  • Human intervention, including port development and coastal construction, disrupts natural sediment transport patterns.

Major Causes

  • Sea-level rise steadily pushes the shoreline inland across low-lying stretches.

  • Stronger coastal hazards, including more frequent and intense cyclones, accelerate erosion during extreme events.

  • Reduced sediment supply results from upstream river interventions that trap sediment before it reaches the coast.

  • Port and harbour development, such as construction activity at Paradip Port, has been linked to erosion impacts in neighbouring Jagatsinghpur and Kendrapara stretches.

  • Sand mining along beaches and riverbanks directly removes material needed for natural coastal buffering.

  • Coastal infrastructure, including roads and embankments, can alter natural wave and sediment dynamics.

  • Destruction of natural barriers, particularly mangrove and dune loss, removes protection that would otherwise absorb wave energy.

Climate Change Is Increasing the Risk

  • Rising sea levels gradually shrink the buffer zone between the sea and human settlements.

  • Intensifying coastal flooding follows from higher baseline sea levels combined with storm events.

  • Stronger cyclone impacts bring higher wind speeds and larger storm surges to the Odisha coast.

  • Storm surge during cyclones can temporarily push seawater far inland, worsening erosion in a single event.

  • Coastal inundation permanently affects low-lying villages, as seen in Satabhaya's submergence.

  • Salinity intrusion into groundwater and farmland degrades agricultural land near the coast, compounding the erosion crisis.

Impacts of Coastal Erosion

Land Loss: 33.6% of India’s mainland coastline experienced erosion during 1990–2018, threatening coastal land, habitats and settlements (Source: NCCR)

Livelihoods: Erosion reduces fishing space, boat-landing areas and tourism assets, directly affecting coastal communities.

Infrastructure: Shoreline retreat threatens houses, roads, ports and coastal industries; harbours, beach mining and dams can further alter sediment flows.

Disaster Risk: Erosion removes the natural coastal buffer, increasing exposure to storm surges, cyclones and sea-level rise.

Ecological Loss: Erosion degrades beaches, dunes, wetlands and mangroves, weakening biodiversity and natural coastal protection.

Salinity: Shoreline retreat can intensify saltwater intrusion, affecting coastal groundwater and agricultural soils.

Displacement: Erosion causes asset loss and relocation pressure; the 15th Finance Commission recommended support for erosion mitigation and resettlement.

Regional Hotspots: During 1990–2022, erosion affected 58.3% of Valsad and 60.3% of Navsari coastline. (Source: NCCR)

Framework to Manage Coastal Erosion

Scientific Mapping: NCCR uses remote sensing and field surveys to identify erosion-prone stretches and prepare Shoreline Management Plans (SMPs).

Hazard-Line Planning: India’s Hazard Line maps long-term risks from erosion, flooding and sea-level rise, supporting disaster-resilient coastal planning.

CRZ Regulation: CRZ Notification 2019 regulates development in sensitive coastal zones and requires States/UTs to update Coastal Zone Management Plans.

Integrated Management: NCSCM promotes Integrated Coastal Zone Management (ICZM) combining ecological conservation, livelihoods, spatial planning and scientific assessment.

Nature-Based Protection: India is developing green coastal infrastructure using sediment cells, hazard mapping and nature-based solutions instead of relying exclusively on hard structures.

Site-Specific Engineering: NCCR supports location-specific interventions; Puducherry and Chellanam demonstrate beach restoration and flood-risk reduction through targeted coastal protection.

Disaster Financing: 2024 guidelines provide ₹1,500 crore for 2021–26 for coastal/river erosion mitigation and resettlement under NDMF/NDRF mechanisms.

Community Resilience: NDMA’s ICRMRP integrates risk assessment, early warning, ecosystem resilience, community capacity and sustainable spatial planning.

Adaptive Governance: India follows a “Map → Monitor → Regulate → Restore → Protect → Relocate” approach, combining SMPs, CRZ enforcement, ecosystem restoration and risk-based relocation.

Challenges In Managing Coastal Erosion

  • Dynamic coastline: Erosion varies across sediment cells and seasons, making uniform engineering solutions ineffective.

  • Data–implementation gap: India has national hazard-line and shoreline mapping, but translating these into local land-use decisions remains difficult.

  • Hard-structure externalities: Seawalls and groynes can interrupt sediment movement and shift erosion to adjoining stretches.

  • Competing land uses: Ports, tourism, fisheries, settlements and conservation compete for limited coastal space, complicating integrated planning.

  • Climate uncertainty: Sea-level rise and changing wave intensity can alter existing erosion patterns, requiring adaptive rather than fixed interventions.

  • Fragmented governance: Coastal management involves multiple ministries, States, local bodies and sectoral agencies, creating coordination and jurisdictional gaps.

Way Forward

  • Data-led planning: Update Shoreline Management Plans using satellite monitoring and sediment-cell mapping.

  • Nature-based protection: Restore mangroves, dunes and beaches before hard structures; Puducherry project restored 1.5 km of beach after 30 years.

  • Site-specific engineering: Use submerged reefs, nourishment or dykes only after sediment and wave studies; Kadalur Periyakuppam’s submerged dyke protected 3 fishing villages.

  • Integrated governance: Link CRZ, Hazard Lines, CZMPs and SMPs with local land-use planning to prevent new settlements in high-risk stretches.

  • Secure funding: Implement the ₹1,500-crore NDMF framework for 2021–26 covering coastal/river erosion mitigation and resettlement.

  • Community resilience: Combine coastal protection with fisher livelihoods and early-warning systems; NCCR’s Thoondil app provides hazard information to Tamil Nadu fishers.

  • Adaptive institutions: The 2026 MoES–Puducherry MoU creates Joint Working Groups and annual reviews for coastal resilience, offering a model for continuous Centre-State coordination.

  • Managed retreat: Repeatedly eroding settlements should receive relocation plus livelihood restoration rather than perpetual reconstruction, supported through the NDMF/NDRF framework.

  • Community-led resilience: Integrate fisher communities into planning, monitoring and livelihood diversification, making coastal protection socially acceptable and locally sustainable. 

Conclusion

Odisha's rising coastal erosion demands integrated, community-centred climate adaptation, not just sea walls and embankments.

Source: INDIANEXPRESS

PRACTICE QUESTION

Q. Discuss the major causes of coastal erosion in Odisha. Examine why nature-based solutions are considered more sustainable than hard engineering measures alone. (250 words)