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Research Papers: Ocean Renewable Energy

Joint Distribution of Environmental Condition at Five European Offshore Sites for Design of Combined Wind and Wave Energy Devices

[+] Author and Article Information
Lin Li

Centre for Ships and Ocean Structures (CeSOS),
University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: lin.li@ntnu.no

Zhen Gao

Centre for Ships and Ocean Structures (CeSOS),
Centre for Autonomous Marine Operations and
Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and
Technology (NTNU),
Trondheim NO-7491, Norway

Torgeir Moan

Centre for Ships and Ocean Structures (CeSOS),
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and
Technology (NTNU),
Trondheim NO-7491, Norway

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 August 8, 2014; final manuscript received February 11, 2015; published online March 18, 2015. Assoc. Editor: António Falcão.

J. Offshore Mech. Arct. Eng 137(3), 031901 (Jun 01, 2015) (16 pages) Paper No: OMAE-14-1108; doi: 10.1115/1.4029842 History: Received August 08, 2014; Revised February 11, 2015; Online March 18, 2015

The design of wind turbines requires information about joint data for wind and wave conditions. Moreover, combining offshore wind and wave energy facilities is a potential way to reduce the cost of offshore wind farms. To design combined offshore renewable energy concepts, it is important to choose sites where both wind and wave energy resources are substantial. This paper deals with joint environmental data for five European offshore sites which serve as basis for the analysis and comparison of combined renewable energy concepts developed in the EU FP7 project—MARINA Platform. The five sites cover both shallow and deep water, with three sites facing the Atlantic Ocean and two sites in the North Sea. The long-term joint distributions of wind and wave parameters are presented for these sites. Simultaneous hourly mean wind and wave hindcast data from 2001 to 2010 are used as a database. The joint distributions are modeled by fitting analytical distributions to the hindcast data. The long-term joint distributions can be used to estimate the wind and wave power output from each combined concept and to estimate the fatigue lifetime of the structure. The marginal distributions of wind and wave parameters are also provided. Based on the joint distributions, contour surfaces are established for combined wind and wave parameters for which the probability of exceedance corresponds to a return period of 50 years. The design points on the 50-year contour surfaces are suggested for extreme response analysis of combined concepts.

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Figures

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Fig. 1

Location of 18 potential European offshore sites

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Fig. 2

Weibull plot of marginal distribution of Uw at site 14

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Fig. 3

Weibull plot of marginal distribution of Hs at site 14 (h0 = 5.0 m)

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Fig. 4

Lognormal plot of conditional distribution of Tp given Hs at site 14. (a) 2.5 m < Hs < 3.0 m and (b) 7.0 m < Hs < 7.5 m.

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Fig. 5

Fitting of Lognormal parameters of conditional distribution of Tp given Hs at site 14

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Fig. 6

Weibul plot of conditional distribution of Hs given Uw at site 14. (a) 4.0 m/s < Uw < 5.0 m/s and (b) 19.0 m/s < Uw < 20.0 m/s.

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Fig. 7

Fitting of Weibull parameters of conditional distribution of Hs given Uw at site 14

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Fig. 8

Mean and COV of Tp for each wind-wave class at site 14

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Fig. 9

Fifty-year contour surface for site 1 (complete method)

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Fig. 10

Fifty-year contour surface for site 3 (complete method)

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Fig. 11

Fifty-year contour surface for site 5 (complete method)

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Fig. 12

Fifty-year contour surface for site 15 (complete method)

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Fig. 13

Fifty-year contour surface for site 14 (complete method)

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Fig. 14

Fifty-year contour surface for site 14 (simplified method)

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