EM 1110-2-1100 (Part II)
30 Apr 02
II-1-5. Definitions of Symbols
α
Dimensionless scaling parameter used in the JONSWAP spectrum for fetch-limited
seas
α
Phillips' constant (= 0.0081) (Equation II-1-153)
αx , αz
γ
Peak enhancement factor used in the JONSWAP spectrum for fetch-limited seas
Γ
Gamma function
∆p
Difference in pressure at a point due to the presence of the solitary wave
[force/length2]
∆t
Sampling interval (Equation II-1-144) [time]
ε
Dimensionless pertubation expansion parameter
ε
Spectral bandwidth used in the probability distribution for waves (Equation II-1-
150)
ε
Wave steepness ( = H/L)
ζ
Vertical displacement of the water particle from its mean position (Equation II-1-
27) [length]
η
Displacement of the water surface relative to the SWL [length]
η(t)
Sea state depicted in time series of the wave profile [length]
η(x,t)
Time series of the wave profile at a point x and time t (Equation II-1-175) [length]
&
η
Mean or expected value of the sea state (Equation II-1-119) [length]
ηenvelope
Envelope wave form of two or more superimposed wave trains (Equation II-1-48)
[length]
Root-mean-square surface elevation [length]
ηrms
θ
Angle between the plane across which energy is being transmitted and the direction
of wave advance [deg]
θ
Principal (central) direction for the spectrum measured counterclockwise from the
principal wave direction [deg]
Spectral shape parameters controlling the shape and the sharpness of the spectral
λ1,2
peak of the Ochi-Hubble spectral model
Mean or expected value of the sea state (Equation II-1-119) [length]
η
ν
Dimensionless Spectral width parameter
ξ
Horizontal displacement of the water particle from its mean position (Equation II-1-
26) [length]
II-1-116
Water Wave Mechanics
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