EM 1110-2-1100 (Part II)
30 Apr 02
Figure II-8-12.
Maximum value of Hs in the surf zone (Goda 1985)
wave heights in a given sea state (a given Hs) and a known joint distribution of Hs and Tp or Tz, an overall
probability distribution of individual wave heights can be computed by a straightforward approach (Goda
(1990), referring to Battjes (1972)).
(b) Extreme individual wave heights are strongly affected by depth-induced breaking. In the surf zone,
the Rayleigh distribution can be expected to overestimate the higher individual wave heights. Practical
approximations for extreme individual wave heights in this case are given by the Construction Industry
Research and Information Association (CIRIA) (1991) as
1.517 H1/3
H1 '
1
H1/3
3
1%
d
(II-9-5)
1.859 H1/3
H0.1 '
1
H1/3
2
1%
d
where H1/3 and d are the local significant height and water depth.
(c) Extreme wave crest heights are sometimes a design consideration. Coastal field measurements
indicate that maximum crest height above the local mean water level can be up to 80 percent of the maximum
wave height (Goda 1985). Figure II-8-14, based on a combination of irregular wave tests in the laboratory
Hydrodynamic Analysis and Design Conditions
II-8-27
Previous Page
