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Why is 3 hours sufficient for extreme statistics?

Why is 3 hours sufficient for extreme statistics?

Why is 3 hours sufficient for extreme statistics?

(OP)
In thread311-297005: 3 hour storm duration, I asked about the standard use of a 3-hour return period to determine the maximum load occurring in a 100-year storm (e.g. Hs=15m). The underlying assumption is that when a 100-year storm occurs, you want your structure to survive the worst load expected to occur if the storm lasts 3 hours. Some replies indicated that the statistics should be pretty reliable over 3 hours, i.e. there will be enough peak load events that their distribution can be fit to an expected distribution for extreme values.
Can someone give me a citation for this? I want to point to a reliable source that indicates that a 3-hour return period is appropriate for estimating the design load in 100-year storm conditions.

RE: Why is 3 hours sufficient for extreme statistics?

just google "DNV RP-C205". Usually, 20 min up to 3 hours are used because this is a time when the seaway can be assuemed stationary.

Cheers

RE: Why is 3 hours sufficient for extreme statistics?

Wow- I never thought he would find a decent reference for that number.

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