Phi coefficient of skewness (Equation III-1-4)

Phi coefficient of kurtosis (Equation III-1-5)

Kinematic viscosity [length2/time]

Mass density of water (salt water = 1,025 kg/m3 or 2.0 slugs/ft3; fresh water =

1,000kg/m3 or 1.94 slugs/ft3) [force-time2/length4]

Mass density of sediment grains [force-time2/length4]

Standard deviation of a sediment sample (Equation III-1-3) [phi units]

n

Sediment grain diameter in phi units (n = -log2 D, where *D *is the sediment grain

diameter in millimeters)

Drag coefficient [dimensionless]

Sediment grain diameter [length - generally millimeters]

Sediment grain diameter for which *x*-percent of the sediment, by weight, has a

smaller diameter

Voids ratio of a sediment sample - ratio of pore space to solid space (Equation III-

1-13a)

Median grain diameter - half the particles in the sample will have a larger diameter

and half will have a smaller diameter [length]

Estimated mean grain size of a sediment sample (Equation (III-1-2) [phi units]

Volume concentration of a sediment sample - ratio of the solid volume to the whole

volume (Equation III-1-13b)

Porosity - ratio of pore space, or voids, to the whole volume

Reynolds number [dimensionless]

Sediment fall velocity [length/time]

III-1-40

Coastal Sediment Properties

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