Why some British coastal towns may have to retreat rather than fight the sea

Not every stretch of Britain’s eroding coastline can or should be defended, according to coastal experts studying the growing threat facing towns like Thorpeness in Suffolk. While breakwaters, seawalls and rock barriers may help protect some shorelines, researchers caution that any measures should be undertaken with care, since defending every location isn’t always possible or even beneficial.

Managed retreat, in which communities gradually adapt to coastal change rather than fight it directly, could be considered in some cases instead. Experts also note that coastal defences can cause erosion elsewhere by altering how sediment moves along a coastline, adding a further layer of complexity to any decision.

There is a growing preference for a combined approach that includes dune restoration, beach replenishment and engineered defences such as offshore breakwaters where they are most effective — rather than relying on any single method everywhere.

According to the Intergovernmental Panel on Climate Change, rising sea levels and extreme weather events are posing greater risks to coastal settlements worldwide, with UK coastlines especially vulnerable because many areas consist of soft cliffs and sediment easily eroded by wave action.