Coastal erosion refers to the wearing away of coastal land, beaches, dunes, cliffs and shorelines due to the action of waves, tides, currents, storm surges and sea-level rise.

It is a serious coastal hazard in India because it affects settlements, fishing communities, ports, tourism, agriculture, coastal infrastructure and coastal ecosystems.

Causes of Coastal Erosion

Natural Causes

Wave Action
- Strong sea waves continuously strike the coast and remove sand, soil and rocks.
- During storms and cyclones, wave energy becomes very high and causes rapid erosion of beaches and coastal land.
Cyclones and Storm Surges
- Cyclones generate strong winds, high waves and storm surges.
- Storm surges push seawater inland and rapidly erode beaches, dunes and low-lying coastal areas.
- The eastern coast of India is especially vulnerable because of frequent cyclones in the Bay of Bengal.
Tidal Action
- Tides cause regular movement of seawater towards and away from the coast.
- In areas with strong tidal currents, sediments are removed from beaches, estuaries and river mouths, leading to erosion.
Sea-Level Rise
- Sea-level rise increases the pressure of seawater on coastal land.
- It leads to inundation of low-lying coastal areas, shoreline retreat, salinity intrusion and greater impact of storm surges.

Anthropogenic Causes

Construction of Dams and Reservoirs
- Dams trap sediments in reservoirs.
- As a result, less sediment reaches the coast through rivers.
- When sediment supply to beaches and deltas reduces, coastal erosion increases.
Ports, Harbours and Breakwaters
- Ports, harbours, jetties and breakwaters interfere with natural sediment movement.
- They may cause sediment deposition on one side and erosion on the other side.
- Thus, coastal structures can shift erosion from one location to another.
Sand Mining
- Illegal and legal extraction of beach and river sand depletes sediment supply to coast
Destruction of Mangroves and Coastal Vegetation
- Mangroves, dunes and coastal vegetation reduce wave energy and bind sediments.
- Their removal for aquaculture, tourism, agriculture, settlements and industry increases coastal erosion risk.
Coral reef degradation — reefs dissipate wave energy; bleaching and destruction removes this natural buffer
Sand mining —Destruction of mangroves — for aquaculture, ports, tourism; mangroves are primary wave energy absorbers; loss accelerates erosion dramatically
Groundwater extraction — causes land subsidence in coastal areas, increasing vulnerability

Effects of Coastal Erosion in India

Loss of Coastal Land
- Coastal erosion causes permanent loss of beaches, agricultural fields, village land and public land.
- The shoreline gradually moves inland, reducing available land for settlement and livelihood.
Threat to Coastal Settlements
- Houses, villages and towns located near the coast become vulnerable.
- Fishing communities are affected more because they usually live close to the shoreline.
Damage to Infrastructure
- Coastal erosion damages roads, bridges, ports, harbours, railway lines, power plants, tourism facilities, coastal protection structures and public buildings.
- This increases repair and reconstruction costs.
Impact on Livelihoods
- Fishing, tourism, agriculture, salt production, coastal trade and small businesses are affected.
- Loss of beaches affects tourism, while damage to landing centres affects fisherfolk.
Salinisation of Soil and Groundwater
- Erosion, coastal flooding and sea intrusion increase salinity in soil and groundwater.
- This affects drinking water availability and agricultural productivity.
Loss of Beaches and Tourism Potential
- Beach erosion reduces the width and quality of beaches.
- This affects recreation, tourism income and local employment.
Damage to Coastal Ecosystems
- Mangroves, coral reefs, sand dunes, wetlands, turtle nesting sites and estuarine ecosystems may be damaged.
- This reduces biodiversity and weakens natural protection against coastal hazards.
Increased Disaster Vulnerability
- Eroded coasts become more exposed to cyclones, storm surges, coastal flooding and sea-level rise.
- Once natural buffers are lost, future disasters become more destructive.
Displacement and Social Stress
- People living in erosion-prone coastal areas may be forced to relocate.
- This can create livelihood insecurity, migration, land conflicts, cultural disruption and social distress.

Coastal Management Techniques to Combat Coastal Erosion

Hard Engineering Measures

Sea Walls
- Sea walls are concrete or stone structures built parallel to the shoreline.
- They protect coastal land from direct wave attack.
Groynes
- Groynes are structures built perpendicular to the coast.
- They trap sand moving along the shore and help maintain beaches.
Breakwaters
- Breakwaters are offshore or nearshore structures that reduce wave energy before waves reach the coast.
- They are useful for protecting ports, harbours and selected coastal stretches.
Revetments
- Revetments are sloping structures made of stones, concrete blocks or other materials.
- They absorb wave energy and protect the coast from erosion.
Gabions
- Gabions are wire cages filled with stones.
- They are used to stabilise coastal banks, dunes and slopes.
- They are relatively flexible and cheaper than large concrete structures.
Offshore Barriers
- Offshore barriers reduce wave impact before waves reach the shoreline.
- They help reduce erosion but may alter coastal processes if poorly designed.

Soft Engineering Measures

Beach Nourishment
- Beach nourishment means adding sand to eroded beaches.
- It restores beach width and provides a natural buffer against waves.
Dune Restoration
- Sand dunes act as natural barriers against waves, storm surges and coastal flooding.
- Dune restoration includes planting vegetation, fencing dunes, preventing trampling and restricting construction over dunes.
Sediment Management
- Sediment bypassing and controlled sediment movement can restore natural sand supply.
- This is useful near ports and harbours where natural sediment transport is blocked.
Setback Zones
- Setback zones restrict construction close to the shoreline.
- They allow the coast to adjust naturally and reduce damage to buildings and infrastructure.
Managed Retreat
- In highly vulnerable areas, shifting people and assets away from the eroding coast may be safer than building protective structures.
- This is useful where erosion is severe and long-term protection is not economically or environmentally viable.

Ecosystem-Based Measures

Mangrove Restoration
- Mangroves reduce wave energy, trap sediments and protect coastal areas from storm surges.
- Restoring mangroves is a cost-effective nature-based solution.
Protection of Coral Reefs
- Coral reefs act as natural breakwaters by reducing wave energy.
- Their protection helps reduce erosion in reef-associated coastal areas.
Conservation of Wetlands
- Coastal wetlands store water, trap sediments and act as buffers against coastal flooding.
- Their conservation reduces erosion and disaster risk.
Shelterbelt Plantations
- Planting trees and vegetation along the coast reduces wind speed, stabilises sand and provides protection against cyclones and storm surges.
- Casuarina plantation — widely used on Tamil Nadu and Odisha coasts as windbreak and wave buffer; though monoculture concerns exist
Seagrass restoration — seagrass beds stabilise sediment on seafloor; reduce wave-driven erosion

Planning and Regulatory Measures

Sediment budget management — regulate upstream dam operations to release periodic sediment flushes to delta coasts
Coastal Regulation Zone Norms
- CRZ norms regulate development activities near the coast.
- They help protect ecologically sensitive areas and reduce risky construction near the shoreline.
Integrated Coastal Zone Management
- Integrated Coastal Zone Management involves coordinated planning of coastal land, ecosystems, infrastructure, tourism, fisheries and livelihoods.
- It balances development with ecological protection and disaster risk reduction.
Shoreline Management Plans
- Coastal stretches should be studied scientifically before choosing protection measures.
- Shoreline management plans help decide where to protect, where to restore, where to restrict construction and where managed retreat is needed.
Hazard Mapping
- Erosion-prone areas should be mapped using satellite imagery, GIS, historical shoreline data, field surveys and local knowledge.
- This helps in planning settlements, infrastructure and coastal protection measures.
Community Participation
- Fisherfolk and coastal communities should be involved in coastal management.
- They possess local knowledge about shoreline changes, tides, currents, erosion points and vulnerable settlements.
  - Eco-tourism as livelihood alternative to sand mining and destructive fishing practices
  - Community surveillance against illegal sand mining — Jan Bhagidari in coastal DM
Sustainable Coastal Infrastructure
- Ports, roads, tourism projects, industries and housing should be planned after proper coastal impact assessment.
- Infrastructure should not disturb sediment movement, block natural drainage or destroy protective ecosystems.

Institutional Framework & Policy

Ministry of Environment, Forest & Climate Change (MoEFCC)
- MoEFCC has delineated the hazard line for the entire coast of the country. The hazard line is indicative of the shoreline changes, including sea level rise due to climate change. This line is to be used by agencies in Coastal States as a tool for Disaster Management including planning of adaptive and mitigation measures. The hazard line features in the new Coastal Zone Management Plans of the coastal States/Union territories approved by the MoEFCC.
- MoEFCC has notified Coastal Regulation Zone Notification, 2019 with a view to conserve and protect coastal stretches, marine areas and to ensure livelihood security to the fisher and other local communities. The coastal regulations, however, permit setting up of erosion control measures in the coast. The notification also provides for No Development Zones (NDZ) along various categories of coastal areas to protect India’s coastline from encroachment and erosion.
- MoEFCC has framed a national strategy for coastal protection along with guidelines for all Coastal States and Union Territories.
Ministry of Earth Sciences
- INCOIS monitors sea-level rise, storm surge, coastal flooding
  - Indian National Centre for Ocean Information Services (INCOIS) has estimated Coastal Vulnerability Index (CVI) for the Indian coastline, which is a cumulative impact of seven coastal parameters i.e., shoreline change rate, sea-level change rate, coastal elevation, coastal slope, coastal geomorphology, significant wave height and tidal range
- National Centre for Coastal Research, (NCCR), an attached office of the Ministry of Earth Sciences, Government of India is mandated to provide best possible technological and scientific services / support for sustainable management of coastal areas by developing and improving capabilities related to coastal water quality, coastal processes, shoreline management, coastal hazards- vulnerability and coastal ecosystems through multi disciplinary and integrated research programmes.
  - It has monitored the shoreline changes for the entire Indian coastline using multi-spectral satellite images along with field-surveyed data for the period 1990-2018. It is observed that 33.6% of the Indian coastline was vulnerable to erosion, 26.9% was under accretion (growing) and 39.6% was in stable state.
The Central Water Commission has also published guidelines for “Protection and Control of Coastal Erosion in India” in 2020 to provide the preliminary design parameters for suitable coastal protection works for different stretches of coastline including Odisha.
The Flood Management Scheme of the Ministry of Jal Shakti, including anti-sea erosion schemes, are planned and executed by the State Governments with their own resources as per priorities of States. The Union Government renders assistance to states which is technical, advisory, catalytic and promotional in nature.
The Union Government is implementing several schemes for increasing forest and tree cover in the country, including mangroves in coastal areas, to prevent erosion. The scheme for ‘Conservation and Management of Mangroves and Coral Reefs’ is being implemented on a 60:40 fund sharing basis between the Center and the States. There are other schemes/programmes such as Compensatory Afforestation Fund Management and Planning Authority (CAMPA), National Afforestation Programme etc., which support afforestation activities across the country, including districts in Odisha. Besides, States/UTs have their own conservation and afforestation programmes, including for mangroves.
- MISHTI Scheme (2023) — Mangrove Initiative for Shoreline Habitats & Tangible Incomes — mangrove restoration across 9 coastal states
NCSCM — National Centre for Sustainable Coastal Management (Chennai) — technical nodal agency; shoreline change atlas, hazard mapping

Coastal erosion in India is caused by both natural processes and human interventions. Waves, tides, currents, cyclones, storm surges and sea-level rise create natural erosion, while dams, ports, sand mining, mangrove destruction and unplanned coastal development intensify the problem. Its effects include land loss, livelihood insecurity, infrastructure damage, salinity intrusion, ecosystem degradation and displacement.

Therefore, coastal erosion management requires a balanced strategy combining hard engineering, soft engineering, ecosystem restoration, coastal regulation, hazard mapping and community participation. The long-term solution lies in Integrated Coastal Zone Management and nature-based coastal resilience.

Sample Mains Questions

Q1. What is coastal erosion? Explain its major natural and anthropogenic causes.
(150 words, 10 marks)

Q2. Discuss the effects of coastal erosion on coastal communities, infrastructure and ecosystems in India.
(150 words, 10 marks)

Q3. Coastal erosion in India is not only a natural process but also a result of human intervention. Analyse.
(250 words, 15 marks)

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