Shields parameter

The Shields parameter is a dimensionless number that helps predict when flowing water will start to move and transport sediment along the bottom of a river or channel. It compares the force exerted by the flowing water (shear stress) to the weight of the sediment particles, indicating whether particles will stay put or be lifted and carried away. A higher Shields parameter suggests that water flow is strong enough to mobilize sediment, leading to erosion or sediment transport, while a lower value indicates stable particles that remain at rest. It’s a key concept in understanding and managing sediment movement in fluid systems.