Sea Defence vs. Coastal Protection: Key Differences

Narrow vs. Broad Coastal Management

Sea Defence (Hard Engineering)

Focus: Protecting land and infrastructure from marine forces (waves, tides, storm surge).

• Seawalls / revetments
• Groynes (trap longshore sediment)
• Breakwaters (offshore wave dissipation)
• Beach nourishment (sand replenishment)
• Dune restoration (vegetation, fencing)

Coastal Protection (Integrated Coastal Zone Management)

Focus: Holistic sustainability of the coastal system—ecological, social, economic.

• Land-use planning (setbacks, zoning)
• Habitat conservation (marshes, mangroves, dunes)
• Water quality regulation (pollution control)
• Climate adaptation (managed retreat, rolling easements)
• Stakeholder engagement & equity

Relationship

Sea defence is a subset of coastal protection. Modern practice favors nature-based solutions (living shorelines, wetland restoration) that provide defence and ecosystem services, over hard structures that often shift erosion elsewhere.