If you can’t get to the beach, you can catch some waves on Medano Creek this month at the Great Sand Dunes National Park. It’s a natural phenomenon that doesn’t happen every year,… ...

Ripples in sand can be formed by wind or waves. The ripples I observed on the beach looked to be mostly formed by water, since they were being uncovered by the outgoing tide.

THE sand waves dealt with in this paper are not the well-known “current mark,” or ripple mark of rivers, but the larger sort, first scientifically described by Prof. Osborne Reynolds. These ...