Joint probability of extreme waves and currents on Norwegian shelf--

Journal Article · Sat Jul 01 04:00:00 EDT 1989 · Journal of Waterway Port Coastal and Ocean Engineering; (USA)

DOI:https://doi.org/10.1061/(ASCE)0733-950X(1989)115:4(534)· OSTI ID:7005448

Heideman, J C ^[1]; Hagen, O ^[2]

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1. Exxon Production Research Co., Houston, TX (USA)
2. Det norske Veritas, Novik (NO)

Simultaneous wave and current measurements on the Norwegian Shelf were used to estimate the appropriate current to associate with extreme waves in platform design. The primary data consisted of seven years of measurements at Tromsoflaket (71{degrees}30'N, 19{degrees}E, 230 m depth), including 38 storms with peak significant wave heights above 7 m. The maximum wave height and maximum current occurred simultaneously in only one of the 38 storms. The wave and current time-series data were used to calculate the time series of drag load on a simple structure and statistics of wave height and drag load were developed. The data showed that the in-line current that must be added to extreme waves in order to preserve the extreme loads approaches 25 cm/s asymptotically as storm severity increases. Sensitivity studies suggest that this limit is largely insensitive to reasonable variations in current profile, wave kinematics theory, structure geometry, tidal current removal, length of data base, or site location. These results show that the current specified by Norwegian regulatory authorities is conservative, and provide a basis for reducing the design hydrodynamic loads on drag-dominated offshore structures on the Norwegian shelf.

• OSTI ID: 7005448
• Journal Information: Journal of Waterway Port Coastal and Ocean Engineering; (USA), Journal Name: Journal of Waterway Port Coastal and Ocean Engineering; (USA) Vol. 115:4; ISSN JWPED
• Country of Publication: United States
• Language: English

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42 ENGINEERING
423000* -- Engineering-- Marine Engineering-- (1980-)
CONTINENTAL MARGIN
CONTINENTAL SHELF
CURRENTS
DESIGN
DRAG
EUROPE
GEOMETRY
GRAVITY WAVES
MATHEMATICS
MEASURING METHODS
NORWAY
OFFSHORE PLATFORMS
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TIME-SERIES ANALYSIS
WATER CURRENTS
WATER WAVES
WESTERN EUROPE