Angle a surface-piercing sloped plane forms with the horizontal [deg]

Angle between the breakwater and the radial distance from the breakwater tip to the

point where the diffraction coefficient (*K*!) is to be determined (Figure II-7-2) [deg]

∆d

Vessel drawdown [length]

Elongation in the mooring line [length]

∆ln

Percent elongation in a mooring line

Angle between the sailing line and the direction of wave propagation [deg]

Angle of the current relative to the longitudinal axis of the vessel [deg]

Angle a mooring line makes in the horizontal plane with the perpendicular to the

vessel [deg]

Kinematic viscosity of water [length2/time]

Mass density of air [force-time2/length4]

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]

Angle a mooring line makes in the vertical plane between the vessel and the dock

[deg]

Phase angle by which a mass displacement lags the excitation displacement [deg]

Amplification factor (ratio of mass displacement to excitation displacement)

[dimensionless]

Projected area of a vessel above the waterline [length2]

Surface area of a bay or basin [length2]

Channel cross-sectional flow area of an inlet [length2]

Vessel's midsection wetted cross-sectional area [length2]

Dimensionless ratio of the waterline length times the beam to the total projected

propeller area

Channel width [length]

Breakwater gap (Figure II-7-6} [length]

Structure crest width [length]

Vessel beam [length]

Imaginary breakwater gap [length] (Figure II-7-6)

Harbor Hydrodynamics

II-7-87

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