Q3.Explain the causes and effects of coastal erosion in India. What are the available coastal management techniques for combating the hazard ?

Coastal erosion is the long-term loss of land along the coastline due to the action of waves, tides, currents, and human activities. It is a significant environmental hazard impacting India's extensive coastline, threatening ecosystems and human settlements.

Natural Factors

• Strong wave action, tidal currents, storm surges, and cyclones (e.g., along Odisha and West Bengal coasts) are primary drivers.
• Climate change-induced sea-level rise and increased storm intensity significantly exacerbate erosion rates.

Anthropogenic Factors

• Construction of dams reduces sediment supply to coasts, starving beaches of natural replenishment.
• Indiscriminate sand mining from beaches and riverbeds removes protective barriers.
• Dredging for navigation and coastal infrastructure development (ports, jetties) alter natural sediment dynamics and currents.

Environmental Impacts

• Permanent loss of valuable land and destruction of critical coastal habitats like mangroves (Sundarbans) and coral reefs.
• Increased saltwater intrusion into freshwater aquifers, impacting agriculture and drinking water supplies.

Socio-Economic Impacts

• Loss of livelihoods for fishing and tourism communities (e.g., Kerala), leading to economic hardship.
• Damage to vital infrastructure such as roads, houses, and public utilities, and displacement of coastal populations.

Hard Engineering Solutions

• Involves constructing rigid structures like seawalls, groynes, and breakwaters to protect the shoreline.
• These are often costly, require regular maintenance, and can sometimes shift erosion problems to adjacent areas.

Soft Engineering Solutions

• Employs natural processes and materials, including beach nourishment (replenishing sand) and dune restoration.
• Mangrove afforestation (e.g., in Gujarat and Andhra Pradesh) is a highly effective biological method to absorb wave energy and stabilize shorelines.

A holistic and sustainable approach is crucial, integrating policy, planning, and community participation. ICZM focuses on balancing development with environmental protection, considering the entire coastal ecosystem to combat erosion effectively and ensure long-term resilience of India's coastlines.