Upper shoreface

[1] The continuous agitation of the sea floor in the upper shoreface environment results in sediments that are winnowed of the smallest grains, leaving only those grains heavy enough that the water cannot keep them suspended.

[1] Seawater is moved in a vertical circular motion when a wave passes.

The radius of the circle of motion for any given water molecule decreases with depth.

The maximum depth of influence of a water wave is half the wavelength.

However, a wave with a 2 feet (0.61 m) wavelength would be moving the water (barely) at the bottom.