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MIT2_017JF09_p18

# MIT2_017JF09_p18 - 18 DECK FLOODING CALCULATION WITH...

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18 DECK FLOODING CALCULATION WITH SHORT-TERM STATISTICS 56 18 Deck Flooding Calculation with Short-Term Statis­ tics Consider a fixed platform subject to storm waves. The waves we consider are those of Sea State 5, for which the modal period is about 9.7 seconds and the significant wave height is about 3.3 meters. Assume that the waves are not affected by the presence of the structure; this is valid for fixed structures which have very small waterplane area. Use the Bretschneider spectrum in what follows. 1. How high must the deck be to suffer a submergence only once every ten minutes? Once per hour? Once per day? I get wave elevations of [2.4 2.8 and 3.5] meters. The formulas are: M i = ω i S ( ω ) 0 2 π η ( T ) = 2 M 0 log Tw modal 2. What is the average lowest value of the 1/100’th highest waves? Of the 1000’th highest waves? Of the 1/10000’th highest waves? I get [2.5, 3.0, 3.5] meters; note these are elevations also. The formulas are: M 2 = 1 2 M 0 M 4 z = 1 2 2 zN η ( N ) = 2 M o log 1 + z 3. Comment on how these two ways of expressing statistics are consistent or not. These

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MIT2_017JF09_p18 - 18 DECK FLOODING CALCULATION WITH...

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