Example Problem II-8-2 (Continued)

of tide, storm surge, and waves must be considered. Since extreme storm surge and waves are often highly

correlated (both can be produced by intense storms), they should not be treated as independent processes. The

relationship between storm surge and waves is embodied in the available measurements to an extreme occurrence

of approximately once in 17 years.

For this example problem, combined tide, storm surge, and waves for design analysis are derived by the following

approach. Each measured wave and surge event (represented by *H*0', Tp, and storm surge height) is coupled with

(Figure II-8-23 is a partial extraction of Table B-37b for use in this example). As before, it is assumed that the

duration of extreme storm surge events is long enough that peak surge will coincide with a high tide, and high tide

level is independent of storm surge level. The *N *high tide levels are determined by dividing the probability

distribution of high tides into *N *equal probability increments and taking the tide level for the mid-probability of

each increment. The number *N *should be large enough that the combined probability of the highest tide level and

the most severe surge/wave event is lower than the design probability.

Example Problem II-8-2 (Sheet 7 of 21)

Hydrodynamic Analysis and Design Conditions

II-8-41

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