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    Extreme Wave Condition at Doggerbank

    Source: Journal of Offshore Mechanics and Arctic Engineering:;2016:;volume( 138 ):;issue: 004::page 41601
    Author:
    Engebretsen, Espen
    ,
    Haver, Sverre K.
    ,
    Myrhaug, Dag
    DOI: 10.1115/1.4033564
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In design of offshore wind turbines, extreme wave conditions are of interest. Usually, the design wave condition is taken as the sea state corresponding to an annual exceedance probability of 2 أ— 10−2, i.e., a return period of 50 years. A possible location for a future wind farm, consisting of bottom fixed wind turbines, is the Doggerbank area. The water depth in this area varies from about 60 m in the north to about 20 m in the south. The hindcast database NORA10 provides sea state characteristics from 1957 to present over a domain covering Doggerbank. Regarding the deeper areas just north of Doggerbank, this hindcast model is found to be of good quality. Larger uncertainties are associated with the hindcast results as we approach shallower water further south. The purpose of the present study is to compare sea state evolution over Doggerbank as reflected by NORA10 with the results of the commonly used shallow water hindcast model SWAN. The adequacy of the default parameters of SWAN for reflecting changes in wave conditions over a sloping bottom is investigated by comparison with model test results. Extreme wave conditions for two locations 102.5 km apart in a north–south direction are established using NORA10. This is done using both, an all sea states approach and a peak over threshold (POT) approach. Assuming the extremes for the northern position to represent good estimates, the wave evolution southward is analyzed using SWAN. The extreme condition obtained from NORA10 in the northern position is used as input to SWAN and the results from the two hindcast models are compared in the southern position. SWAN seems to suggest a somewhat faster decay over Doggerbank compared to NORA10.
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      Extreme Wave Condition at Doggerbank

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    http://yetl.yabesh.ir/yetl1/handle/yetl/162290
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    • Journal of Offshore Mechanics and Arctic Engineering

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    contributor authorEngebretsen, Espen
    contributor authorHaver, Sverre K.
    contributor authorMyrhaug, Dag
    date accessioned2017-05-09T01:32:29Z
    date available2017-05-09T01:32:29Z
    date issued2016
    identifier issn0892-7219
    identifier othervib_138_05_051012.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/162290
    description abstractIn design of offshore wind turbines, extreme wave conditions are of interest. Usually, the design wave condition is taken as the sea state corresponding to an annual exceedance probability of 2 أ— 10−2, i.e., a return period of 50 years. A possible location for a future wind farm, consisting of bottom fixed wind turbines, is the Doggerbank area. The water depth in this area varies from about 60 m in the north to about 20 m in the south. The hindcast database NORA10 provides sea state characteristics from 1957 to present over a domain covering Doggerbank. Regarding the deeper areas just north of Doggerbank, this hindcast model is found to be of good quality. Larger uncertainties are associated with the hindcast results as we approach shallower water further south. The purpose of the present study is to compare sea state evolution over Doggerbank as reflected by NORA10 with the results of the commonly used shallow water hindcast model SWAN. The adequacy of the default parameters of SWAN for reflecting changes in wave conditions over a sloping bottom is investigated by comparison with model test results. Extreme wave conditions for two locations 102.5 km apart in a north–south direction are established using NORA10. This is done using both, an all sea states approach and a peak over threshold (POT) approach. Assuming the extremes for the northern position to represent good estimates, the wave evolution southward is analyzed using SWAN. The extreme condition obtained from NORA10 in the northern position is used as input to SWAN and the results from the two hindcast models are compared in the southern position. SWAN seems to suggest a somewhat faster decay over Doggerbank compared to NORA10.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleExtreme Wave Condition at Doggerbank
    typeJournal Paper
    journal volume138
    journal issue4
    journal titleJournal of Offshore Mechanics and Arctic Engineering
    identifier doi10.1115/1.4033564
    journal fristpage41601
    journal lastpage41601
    identifier eissn1528-896X
    treeJournal of Offshore Mechanics and Arctic Engineering:;2016:;volume( 138 ):;issue: 004
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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