P

Vector gradient operator (Equation II-5-11)

Inflow angle (tropical storm parameter) [deg]

Tidal phase lag [deg]

Angle of storm propagation (tropical storm parameter) [deg]

Epoch of constituent n, i.e., phase shift from tide-producing force to high tide from

t0 [deg]

Modified form of the epoch that automatically accounts for the longitude and time

meridian corrections (Equation II-5-20) [deg]

Mean frequency of observed events per time period used in the Poisson probability

law (Equation II-5-25)

Wave amplitude [length]

Speed of tide constituent n [degrees/time]

PX

Attractive force of the moon and sun at any point *X *(Equation II-5-10)

Wave celerity [length/time]

Universal constant (= 6.67 10-8 cm3/ gm sec2)

Gravitational force (Equation II-5-7) [force-length/time2]

Factor for adjusting mean tidal amplitude *H*n values for specific times

Water depth [length]

Height of the tide at any time t (Equation II-5-16) [length]

Mean water level above some defined datum [length]

Mean amplitude of tidal constituent *n *[length]

Wave number (= 2*π/L *= 2*π/CT*) [length-1]

Wave length [length]

Length of a basin [length]

Mass of the moon

Number of nodes along the axis of a basin

Number of storm events used in the Poisson probability law (Equation II-5-25)

The subscript 0 denotes deepwater conditions

Water Levels and Long Waves

II-5-69

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