Up the Swash

This picture shows the swashing of the sea onto the beach. There are two processes involved with this, swash and backwash. Swash is the process of water travelling up the sand or pebbles, and backwash is the return process. With this, sediment can be dropped off or picked up and carried away down the shoreline.

Debris by Force

These wild rapids move sediment, twigs and rocks downstream with fluid motion. Rapids occur where the gradient of the riverbed is steep, causing an increase in water velocity and turbulence. It is an interesting hydrological feature between a run (flat section) and a cascade (vertigal section) of a river.