EM 1110-2-1100 (Part III)
30 Apr 02
III-2-6. Definition of Symbols
α
Wave crest angle relative to bottom contours [deg]
Wave breaker angle relative to the shoreline [deg]
αb
β
Geometric parameter in the expression to approximate the shoreline in the lee of
headland-type features (Equation III-2-24 III-2-24 and Figure III-2-27) [deg]
γ
Energy flux dissipation rate [dimensionless]
Γstb
Stable wave height to water depth ratio for wave re-formation
g
Shoreline diffusivity parameter (Equation III-2-26) [length2/time]
θ
Geometric parameter in the expression to approximate the shoreline in the lee of
headland-type features (Equation III-2-24 and Figure III-2-27) [deg]
Azimuth angle of the outward normal to the shoreline (Equation III-2-17) [deg]
θn
κ
Breaker index Hb/db [dimensionless]
Λmix
Lateral mixing coefficient [dimensionless]
ξb
Surf similarity parameter [dimensionless]
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 (2,650 kg/m3 or 5.14 slugs/ft3 for quartz-density
ρs
sand) [force-time2/length4]
a1, a2
Dimensionless parameters used in the GENESIS empirical predictive formula for
longshore sand transport rate (Equation III-2-42)
C0, C1, C2
Coefficients in expression to approximate the shoreline in the lee of headland-type
features (Equation III-2-24)
Wave group speed at the breaker line [length/time]
Cb
Cf
Friction coefficient
Cg
Wave group speed [length/time]
Cg0
Wave group speed in deep water [length/time]
Cgb
Wave group speed at the breaker line [length/time]
d
Water depth in the surf zone, including wave-induced setup [length]
db
Water depth at the breaker line [length]
dB
Berm crest elevation or beach berm height above still-water [length]
dc
Depth of appreciable sand transport as measured from still-water level [length]
III-2-110
Longshore Sediment Transport
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