Coastal blowouts at the beach-dune interface can significantly impact dune evolution by transporting sediment from the beach into the dune field. A study at Sefton dunes in England used sensors to measure airflow and sediment transport during oblique onshore winds. They found that deflected airflow along the shore delivers sediment to the blowout throat, where transport intensity varies greatly in a small area. A shift in wind direction increased sediment transport into the blowout, showing how sediment moves from the beach into the dune field through topographical funnelling of local winds.