Natalie, your post reminded me of this video I saw about a similar sand artist a while back.
His name is Peter Donnelly, and he works in Christchurch, New Zealand. I love hearing him talk about his process and what the artwork means. Spectators have to be in a very short "window of opportunity" in order to see the artwork before it is swept away by the tide. It's interesting how the impermanence of the work is as important as the drawing itself.