6. Wave Run-up and Overtopping
207
Deep Water
First calculate the deep water, un-refracted wave height, Ho from where
measured back ont to deep water. Using the depth where waves measured,
and assuming T = Tm = 6 s and H = Hs gives,
d
2-tt(4.0)
— = ------= ------------- — — 0 0711
Lo gT>
(9.81)(6)2
ÆL-k
Ho
\l C 2n
H
—— = 0.9694, the shoaling coefficient, ks
Ho
From Table C-l, of the shore Protection Manual [1984] (refer —
Appendix A)
Therefore,
Toe of structure
Next, shoal the deepwater wave toe depth, d = 2.5 m at the toe of the
structure.
From Table C-l, of the shore Protection Manual [1984] (refer —
Appendix A) for
dtoe
27vdtoe
2?r(2.5m)
irip =pw=0"45
Htoe
= 1.0417
Htoe = 1.54(1.0417) = 1.6 m
Deepwater wave steepness, Sm
ç
toe
‘ InHtoe
2tt(1.6)
m~ Lm - gT^ ~ 9.81(6)2
Sm = 0.028
Surf-similarity parameter,
tance
sm = rç—
v 'm
1/2.5 _ 0.4
7028 ~ 0.1687