Coastal Erosion on Hayling Island

The changing coastline and sea defence challenges

Coastal erosion is a constant and pressing concern on Hayling Island. The island's low-lying geography, its exposure to southerly storms and the effects of rising sea levels mean that the coastline is under continuous pressure from the sea.

The south-facing beach is the most visually affected. Storm events strip sand and shingle from the beach, lowering its level and reducing the natural defence that the beach provides against wave action. Beach recharge schemes, in which sand and shingle are imported and deposited on the beach, have been carried out periodically to rebuild the frontage. These schemes are expensive and temporary, with the imported material gradually being moved along the coast by longshore drift and offshore by storm waves.

The eastern and western shores of the island, bordering Chichester and Langstone Harbours, are subject to different erosion processes. The harbour edges are predominantly salt marsh and mudflat, and these soft, low-energy environments are vulnerable to erosion from boat wash, tidal scour and sea level rise. Salt marsh loss in both harbours has been documented over decades, and the loss of this natural habitat reduces both the ecological value of the harbours and the natural flood protection that salt marshes provide.

Sea defences on Hayling include sea walls, groynes, rock armour and earth embankments. These structures protect properties and infrastructure from flooding and erosion, but they require regular maintenance and periodic replacement. The cost of maintaining sea defences is met from public funds, and the level of investment depends on the value of the assets being protected and the number of properties at risk.

The Hayling Island Coastal Management Strategy, developed by the Eastern Solent Coastal Partnership, sets out the long-term approach to managing the island's coastline. The strategy considers the options for each section of the coast, ranging from hold the line (maintaining existing defences) to managed realignment (allowing the coast to retreat in a controlled manner) to no active intervention.

Climate change is expected to increase the rate of sea level rise and the frequency and intensity of storm events, putting additional pressure on the island's defences. The long-term future of some low-lying parts of the island depends on continued investment in sea defences and on the willingness of government to fund the protection of coastal communities.

For residents, coastal erosion is not an abstract concern. Properties near the coast can be affected by flooding, undermining and loss of garden or land. Insurance premiums in flood-risk areas reflect the risk, and some properties may struggle to obtain affordable cover. The issue affects property values, quality of life and the long-term viability of the island as a residential community.