Q. Explain the causes and effects of coastal erosion in India. What are the available coastal management techniques for combating the hazard ?

Model Answer: 

Coastal erosion involves the permanent loss of coastal landmass and beaches. According to the INCOIS Report, approximately 34% of India’s 7,516 km coastline is currently facing varying degrees of erosion.

Causes of Coastal Erosion in India

• Sea-Level Rise: Climate change-induced thermal expansion and glacier melt submerge low-lying coastal regions (Sunderbans).
• Extreme Weather: Frequent, severe cyclones accelerate rapid coastal sediment removal (Cyclone Amphan, Phailin).
• Sand Mining: Unregulated beach sand mining aggressively weakens natural coastal buffers (Kerala coast).
• Unscientific Infrastructure: Hard port structures and dredging block natural longshore sediment drift (Ennore Port).
• Upstream Dams: Large river dams restrict natural riverine sediment supply to downstream coastal deltas.

Effects of the Hazard

• Human Displacement: Submergence of habitable land forces climate-induced migration and refugee crises (Ghoramara Island).
• Infrastructure Damage: Erodes coastal highways, ports, and tourism hubs, causing massive economic losses.
• Saline Intrusion: Breaches natural barriers, contaminating groundwater aquifers and destroying agriculture (Kuttanad).
• Biodiversity Loss: Wipes out critical estuarine habitats and turtle mass-nesting sites (Olive Ridleys, Rushikulya).

Coastal Management Techniques

• Hard Engineering (Structures): Deploying seawalls and tetrapods to artificially dissipate destructive wave energy (Marine Drive, Mumbai).
• Groynes & Breakwaters: Building barriers perpendicular to the shore to intercept and trap longshore sediment.
• Ecosystem Restoration (Soft): Regenerating mangroves and coastal shelterbelts to bind soil naturally (Bhitarkanika, Odisha).
• Beach Nourishment: Artificially pumping sand onto depleted beaches to restore natural wave-buffering capacity.
• Geosynthetic Tubes: Deploying geo-bags to absorb wave impacts without causing rigid ecological disruption (Pentha Beach).
• Regulatory Zoning: Enforcing ‘No Development Zones’ via Hazard Line mapping (CRZ Notification 2019, ICZM Project).

Combating coastal erosion requires shifting from purely reactive structural defenses to proactive, nature-based solutions integrated within a robust Integrated Coastal Zone Management (ICZM) framework to ensure long-term climate resilience.