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Wind, Waves and Currents
Specifying Design Conditions for Offshore Wind Farms
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Design Cases For Offshore Turbines
For Scenario: Case 1.1
operational conditions:
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Design Cases For Offshore Turbines
For Scenario: Case 6.1c(with alterations)
Extreme conditions
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Operational CaseWind: higest operational
Current: NCM = wind-generated + breaking wave currentsScenario assumption: no breaking wave current
Waves: normal sea state associated with highest operational wind
BS 6349-1:2000 „Maritime structures – Part 1: Code for practice for general criteria“
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Wave Parameters
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Significant Wave Prediction Chart
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Extreme Case
Wind: Reduced Extreme Wind Speed
Current: Extreme Current Model, 50 years extreme
Scenario assumption: Subsurface current only
Waves: 50 years extremeBS 6349-1:2000 „Maritime structures – Part 1: Code for practice for general criteria“
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Typical Wave Data
Wavehight (m) vs Time (years): Hs – red; Hmax - green
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Return Period and Probabylity
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Probability Distributions
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Example from Data
Probability vs Wavehight (m): Hs – red; Hmax - green
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Example from Data
Same using Gumbel distributionHs – red; Hmax – green; probability of 50years event - blue
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Wave Period
Wavehight (m) vs Period (s)
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More Reading
Example of a Wave Data Report (available on MOODLE):
https://moodle.ucl.ac.uk/mod/resource/view.php?id=1534943
Holthuijsen, Leo H. (2007). Waves in Oceanic and Coastal Waters. Cambridge University Press.
3. Description of ocean waves3.1 Key concepts3.2 Introduction3.3 Wave height and period3.4 Visual observations and instrumental measurements
4. Statistics4.3 Long-term statistics (wave climate)
Online version available at:http://app.knovel.com/hotlink/toc/id:kpWOCW0002/waves-in-oceanic-coastal