High Quality Content by WIKIPEDIA articles! The phrase Sediment transport is used to describe the movement of solid particles (sediment) and the processes that govern their motion. Sediment transport is typically due to a combination of the force of gravity acting on the sediment, and/or the movement of the fluid in which the sediment is entrained. This is typically studied in natural systems, where the particles are clastic rocks (sand, gravel, boulders, etc.), mud, or clay; the fluid is air, water, or ice; and the force of gravity is due to the sloping surface on which the particles are resting. This occurs in rivers, glaciers, wind, ocean currents, tides, and on hillslopes.