The transport of sand into the valley has decreased since AD 1920, a decreased that can be traced to both climate changes after the end of the Little Ice Age and efforts by Soil Conservation Service of Iceland to increase vegitation on the sand field and the beach.
Sandfokið í dalnum hefur minnkað verulega eftir 1920, og má rekja það bæði til enda Litlu Ísaldarinnar og uppgræðslu sandanna af hálfu Landgræðslu ríkisins.