Table 4-7. Longshore Energy Flux.Pg , for a Single Periodic Wave in
Any Specified Depth. (Four Equivalent Expressions from
Small-Amplitude Theory)
Equation
(energy/time/distance)
Data Required
(any consistent units)
4-31
2Cf (% Ë sin 2a)
d, T, H,ao
4-32
C (1 4Ëosin2c^)
d.T,Ho,Oo
4-33
KlCo
Ëo sin 2a)
T, Ho,ao,a
4-34
(2C) (K£ CoylCg (1 4Ësin2oçJ)
d, T, H, ao,a
no subscript indicates a variable at the specified depth
where small-amplitude theory is valid
Cg = group velocity (see assumption 1b, Table 4-9)
CQ = deepwater
d = water depth
H = significant wave height
T = wave period
G = angle between wave crest and shoreline
I cos ao
Kd = refraction coefficient < -------R
y cos a
Table 4-8. Approximate Formulas for Computing Longshore
Energy Flux Factor, Pg$, Entering the Surf Zone
Equation
(ft.-lbs./sec./ft. of beach front)
Data Required
(ft.-sec. units)
4-35
32.1 Hfc5/2 sin 2ab
4-36
18.3 Ho5/2 (cos ao)1/4 sin 2ao Ho-ao
4-37
20.5 T H2 sin ab cos ao
T» HO’aO’ab
4-38
100.6 (Hg/T) sin aQ
T,Hfc,ao
Ho = deepwater
= breaker position
H = significant wave height
T = wave period
G = angle between wave crest and shoreline
See Table 4-7 for équivalent small amplitude équations and
Table 4-9 for assumptions used in deriving Pgi from Pg.
4-97