A sandy beach is actually sometimes a pretty good place to think about fluvial forms and processes. The small streams, swashes, outfalls, and ebb-tide channels can be examined up-close, and they change several times each day, with the tidal cycle (here where I am at the moment in South Carolina, two high and two low tides each day). Thus Buck Swamp Creek, which discharges on the beach near where I’m staying, goes through four cycles of change a day.

A lot of work in recent years suggests that unless the material is pretty cohesive (which of course beach sand is not), without vegetation stream channels tend to be braided, and single-channel meandering forms are rare. You can see that here, where the marsh creeks—with plants and mud—are meandering, but develop nice braided patterns where they cross the sand. But along a mud coast near Cairns, Australia, where I spent some time last (N. hemisphere) summer, the same kinds of channels across the tide flats were meandering.

Braided channel crossing the beach at low tide, Myrtle Beach, SC.