EM 1110-2-1100 (Part III)
30 Apr 02
III-1-7. Definition of Symbols
Phi coefficient of skewness (Equation III-1-4)
αn
βn
Phi coefficient of kurtosis (Equation III-1-5)
Kinematic viscosity [length2/time]
ν
Mass density of water (salt water = 1,025 kg/m3 or 2.0 slugs/ft3; fresh water =
ρ
1,000kg/m3 or 1.94 slugs/ft3) [force-time2/length4]
Mass density of sediment grains [force-time2/length4]
ρs
σn
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]
CD
D
Sediment grain diameter [length - generally millimeters]
Dx
Sediment grain diameter for which x-percent of the sediment, by weight, has a
smaller diameter
e
Voids ratio of a sediment sample - ratio of pore space to solid space (Equation III-
1-13a)
g
Md
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]
Mn
N
Volume concentration of a sediment sample - ratio of the solid volume to the whole
volume (Equation III-1-13b)
P
Porosity - ratio of pore space, or voids, to the whole volume
Re
Reynolds number [dimensionless]
Wf
Sediment fall velocity [length/time]
III-1-40
Coastal Sediment Properties
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