Since the early 20th century the supply of sand to the bay has depleted and erosion is occurring so that, if natural processes are uninterrupted, the coastline may in time retreat back to its previous line, visible as a line of higher ground between Redend Point and the hill east of the Knoll House Hotel. In January 2004 the BBC television series "The National Trust" investigated the conflicts between different groups of people who use the beach and heath at Studland. The series particularly covered the debate about coastal management, with the Trust proposing to remove defensive walls to allow natural processes to shape the coastline, though this would result in loss of some land and property.