Explain the causes and effects of coastal erosion in India. What are the available coastal management techniques for combating the hazard ?
Approach · directive: “explain / what”
What it asks · Explain the natural and human causes of coastal erosion in India, its effects on people and ecosystems, and the hard, soft and policy tools available to manage it.
It asks 3 things — answer each
- Explain the causes of coastal erosion in India, natural and human
- Explain its effects on people and ecosystems
- What coastal management techniques are available to combat it: hard, soft and policy tools
Open with · Coastal erosion is the loss of shoreline to waves, currents and storms; NCCR found 33.6% of India's mainland coast eroding over 1990-2018, and the Government concedes it hits fishing communities (PIB, 2023).
Cover
- Natural causes: wave action, longshore currents, storms and cyclones, sea-level rise, tides and loss of sediment supply.
- Human causes: dams and sand mining that cut river sediment, ports and harbours that block sand drift, seawalls that shift erosion elsewhere, destruction of mangroves and dunes, and coastal construction.
- Effects on people: loss of land, homes and livelihoods, especially of fishing communities, saltwater intrusion, damage to roads, ports and tourism, and displacement.
- Effects on ecology: loss of beaches, mangroves and wetlands, damaged turtle habitats and greater flood and storm-surge risk.
- Hard techniques: seawalls, groynes, breakwaters, revetments and offshore reefs; effective locally but costly and may move erosion down the coast.
- Soft and policy measures: beach nourishment, mangrove and dune restoration, shelterbelts, Coastal Regulation Zone rules, shoreline mapping, integrated coastal zone management and managed retreat.
Close with · Working with natural buffers rather than against the sea, and planning settlements by the hazard line, is how India can meet the Sendai Framework's aim of fewer disaster losses and keep its coast habitable.
Add value (verified)
- PIB (December 2023): stretches of India's shoreline erode from natural and human causes, and erosion affects coastal communities including fishermen.PIB, MoEFCC (4 December 2023): Coastal Erosion (Parliament reply) ↗“Some stretches of India’s shoreline are subject to varying degrees of erosion due to natural causes or anthropogenic activities. The coastal erosion does impact coastal communities residing in the erosion prone areas including fishermen communities.”
- PIB (December 2023): coastal erosion mitigation at Puducherry and Chellanam (Kerala) restored coastal areas lost at Puducherry and relieved flooding at Chellanam fishing village.PIB, MoEFCC (4 December 2023): Coastal Erosion (Parliament reply) ↗“Coastal erosion mitigation measures have been taken up at Puducherry and Chellanam in Kerala, which helped in restoration and protection of coastal areas lost at Puducherry and flooding at Chellanam Fishing Village.”
- PIB (July 2022): the CRZ Notification 2019 provides No Development Zones along coastal areas to protect the coastline from encroachment, erosion and accretion.PIB, MoEFCC (18 July 2022): Combating Sea Erosion and protection of India's coastal areas and coastal communities (Lok Sabha reply) ↗“The notification also provides for ‘No Development Zones’ (NDZ) along various categories of coastal areas to protect India’s coastline from encroachment, erosion and accretion.”
- PIB (July 2022): MoEFCC has delineated a hazard line for the entire coast, indicating shoreline change including sea-level rise, for use in disaster management and Coastal Zone Management Plans.PIB, MoEFCC (18 July 2022): Combating Sea Erosion and protection of India's coastal areas and coastal communities (Lok Sabha reply) ↗“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.”
- PIB (July 2022): a national strategy for coastal protection with guidelines has been framed for all coastal States and UTs; Coastal Management Information System sites are complete in Kerala, Tamil Nadu and Puducherry.PIB, MoEFCC (18 July 2022): Combating Sea Erosion and protection of India's coastal areas and coastal communities (Lok Sabha reply) ↗“A national strategy for coastal protection along with guidelines has been framed for all Coastal States and Union Territories by MoEFCC.”
Question: UPSC's CS (Main) 2022, GS Paper III — paper ↗. Approach: Minimalist IAS, checked 3 Oct 2026 (how we verify) — UPSC publishes no model answers. ·
Model answer· 365words · Minimalist IAS
Coastal erosion is the loss of shoreline to waves, currents and storms. The National Centre for Coastal Research found about a third of India's mainland coast, 33.6% over 1990-2018, eroding to varying degrees, and it hits coastal communities, fishermen most of all (PIB, 2023).
Causes of coastal erosion in India
- Natural forces: wave action, longshore currents, storms and cyclones, tides and sea-level rise.
- Sediment starvation: dams and river-sand mining cut the sand that rivers once delivered to the coast.
- Structures on the shore: ports, harbours and breakwaters block the natural drift of sand, and seawalls shift erosion to the next stretch.
- Lost buffers: destruction of mangroves and dunes, and construction on the beach itself.
Effects of coastal erosion
- People: loss of land, homes and livelihoods, especially of fishing communities; saltwater intrusion into wells and fields; damage to roads, ports and tourism; displacement.
- Ecology: loss of beaches, mangroves and wetlands, damaged turtle-nesting habitats and greater exposure to floods and storm surges.
Coastal management techniques to combat the hazard
| Approach | Techniques | Limits |
|---|---|---|
| Hard engineering | seawalls, groynes, breakwaters, revetments | costly; shifts erosion down-coast |
| Soft engineering | beach nourishment, mangroves, dunes, shelterbelts | slow; needs sand and space |
| Policy and planning | CRZ 2019, hazard line, shoreline plans | depends on enforcement |
- Hard engineering: protects a stretch directly but needs maintenance and often moves the problem along the coast.
- Soft engineering: works with nature; beach restoration at Puducherry and mitigation at Chellanam (Kerala) by the Ministry of Earth Sciences recovered lost shore and eased flooding (PIB, 2023).
- Regulation: the CRZ Notification 2019 sets No Development Zones to protect the coast from encroachment, erosion and accretion; MoEFCC has delineated a hazard line for the entire coast, showing shoreline change and sea-level rise, for use in Coastal Zone Management Plans.
- Planning: a national strategy for coastal protection with guidelines for all coastal States, Shoreline Management Plans, Coastal Management Information System sites in Kerala, Tamil Nadu and Puducherry (PIB, 2022), curbs on sand mining and managed retreat where protection is not viable.
Working with natural buffers rather than against the sea, and planning settlements by the hazard line, is how India can meet the Sendai Framework's aim of fewer disaster losses and keep its coast habitable.
Prepared by Minimalist IAS to the answer standard of Shivam Singh (mentor, 7 years) · facts checked against official sources (how we verify) · updated 3 Oct 2026. UPSC publishes no model answers: compare your structure and coverage with this, then write your own.
