Sediment grade scale
The grouping of sediment particles into size classes based on particle diameters uses
the American Geophysical Union size classification scale of 1947.
See Table B-1
Sediment load
A general term that refers to material in suspension and/or in transport. It is not
synonymous with either discharge or concentration.
See total sediment load
Sedimentology
The scientific study of sediment, sedimentary rocks, and the processes by which they
are formed--more specifically for this report, it is a study of detachment, transport,
and deposition of sediment particles in streams and other water bodies.
Sediment particles
Fragments of mineral or organic material in either a singular or aggregate state.
Sediment property categories
Sediment properties can be divided into two categories: (a) those related to the
particle itself and (b) those related to the sediment mixture or deposit.
Sediment transport (rate)
See sediment discharge.
Sediment yield
The total sediment outflow from a drainage basin in a specific period of time. It
includes bed load as well as suspended load, and usually is expressed in terms of
mass, or volume per unit of time.
Settling
The downward movement of suspended-sediment particles.
Shape Function
See Basis function
Shear Stress (Bed)
Frictional force per unit of bed area exerted on the bed by the flowing water. An
important factor in the movement of bed material.
Glossary of Terms 165
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