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Research Papers: Structures and Safety Reliability

Metocean Conditions in a Norwegian Fjord in Relation to the Floating Bridge Design

[+] Author and Article Information
Jungao Wang

Department of Mechanical and Structural
Engineering and Materials Science,
University of Stavanger,
Stavanger NO-4036, Norway
e-mail: jungao.wang@uis.no

Lin Li

Department of Mechanical and Structural
Engineering and Materials Science,
University of Stavanger,
Stavanger NO-4036, Norway
e-mail: lin.li@uis.no

Jasna Bogunović Jakobsen

Department of Mechanical and Structural
Engineering and Materials Science,
University of Stavanger,
Stavanger NO-4036, Norway
e-mail: jasna.b.jakobsen@uis.no

Sverre Kristian Haver

Department of Mechanical and Structural
Engineering and Materials Science,
University of Stavanger,
Stavanger NO-4036, Norway
e-mail: sverre.k.haver@uis.no

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received May 2, 2018; final manuscript received September 13, 2018; published online October 12, 2018. Assoc. Editor: Yordan Garbatov.

J. Offshore Mech. Arct. Eng 141(2), 021604 (Oct 12, 2018) (9 pages) Paper No: OMAE-18-1052; doi: 10.1115/1.4041534 History: Received May 02, 2018; Revised September 13, 2018

The present study investigates the environmental conditions in the Sulafjord in Norway, where a floating bridge is being considered for construction. Fifteen months of wave and wind measurement data in the fjord are compared to the hindcast data at a relevant offshore site and a good overall correlation between the two is found. Furthermore, a quantitative relationship between the wave conditions offshore and in the fjord is established based on the storm event analysis. Accordingly, the identified relationship and the 60-year of offshore hindcast data enable the estimation of the design environmental conditions in the fjord, by adapting the fitted marginal and joint distribution of the wave conditions at the offshore site. The present study illustrates the possibility of using more data from the hindcast model for the design when the measurement data are limited.

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References

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Figures

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Fig. 1

Elevation map of the Sulafjord site on the west coast of Norway including the floating bridge and buoy locations in an enlarged view

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Fig. 2

Comparison of the wind and wave conditions between the measurement and the hind cast data

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Fig. 3

Rose plots of the significant wave height at five sites (the wave height class is the same for three buoys, as shown in the right-side of the figure)

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Fig. 4

A map including the water depth contour lines in and outside of the Sulafjord [13]

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Fig. 5

Wind roses at five sites

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Fig. 6

Comparison of the wind and wave conditions between the measurement and the hind cast data (storm event 2)

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Fig. 7

Comparison of the significant wave height between the measurement and the hind cast data (storm event 2)

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Fig. 8

Comparison of the significant wave height between the measurement and the hind cast data (storm event 1)

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Fig. 9

Comparison of the wind and wave conditions between the measurement and the hind cast data (storm event 5)

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Fig. 10

Samples with the mean wave direction from 285 to 315 and the selected POT samples

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Fig. 11

Comparison of the Weibull distribution and the GPD for the POT samples at the offshore site

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Fig. 12

The Lognormal-Weibull distribution of all the samples with the mean wave direction within 285 deg and 315 deg at the offshore site

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Fig. 13

Raw data and the estimated Hs − Tp contour lines at the offshore site

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Fig. 14

Estimated Hs − Tp contour lines at buoy B

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