b) Waves of period 6 seconds and height 2.5m are propagating in water 10m deep. What is their wavelength, power per meter of crest, and breaking height? Are these waves deep, intermediate, or shallow?
c) Calculate the maximum wave-induced horizontal drag force on a 1.2m diameter sphere held at 3m below the surface. Take Co as 0.7.
d) Explain why the lift force may be more important than drag or inertia forces in determining the design of a steel lattice structure exposed to water waves.
and Period for a wind speed of 12m/s and fetch of 50km over a water depth of 45m. What would be the minimum duration to achieve these waves?
Appendix A
Equations for estimating wave height and period for intermediate waves are as follows:
The dimensionless depth is
h = gh
(A1)
and the dimensionless fetch is,
(A2)^2
The limiting duration is given by
(A3)
and significant wave height, Hs, and period, Ts, from
(A4)
0.077F^0.25
(A5)
which for deep water as h tends to infinity reduce to gir = 0.283 tanh(0.0125F,0.42) U^2 = 7.54 tanh(0.077F^0.25) But the duration limit equation does not converge to the usual
(A6)
(A7)
(A8)
U
