Waves and associated currents–experiences from 5 years metocean measurements in the northern North Sea

Bruserud, Kjersti; Haver, Sverre

doi:10.1016/j.marstruc.2017.05.009

Cited by 6 publications

(4 citation statements)

References 35 publications

(44 reference statements)

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“…It is concluded that the joint behaviour of these variables produces differences in hydrodynamic loads estimation. In [26] it is concluded that offshore standards tend to overestimate the ultimate limit state loads, because they do not account for long-term correlation between waves and current environment.…”

Section: Brief Note About the Deterministic Design Of Scour Protectionsmentioning

confidence: 99%

Probabilistic design and reliability analysis of scour protections for offshore windfarms

Fazeres-Ferradosa

Taveira-Pinto

Romão

et al. 2018

Engineering Failure Analysis

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Scour protection is an important component of fixed bottom foundations for offshore wind turbines. Depending on the hydrodynamic conditions, they might be indispensable to avoid the structural collapse of the foundation due to scour phenomena. The design of scour protections is typically deterministic, which often results in overestimated mean diameters of the armour layer. Moreover, the design methodologies currently applied do not provide a measure of safety associated with the proposed design. The present research proposes a novel methodology to assess the safety of the protection and to perform the probabilistic design of static and dynamic scour protections. A case study based on Horns Rev 3 offshore wind farm is used to show how to select the mean stone diameter according to a pre-defined probability of failure of the protection. The results show that a dynamic scour protection could be safely designed with a reduction of the mean stone diameter up to 15 cm, when compared with the statically stable protection.

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Section: Brief Note About the Deterministic Design Of Scour Protectionsmentioning

confidence: 99%

Probabilistic design and reliability analysis of scour protections for offshore windfarms

Fazeres-Ferradosa

Taveira-Pinto

Romão

et al. 2018

Engineering Failure Analysis

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show abstract

“…Bruserud and Haver [80] utilised idealised measured current data from a deep water location in the Norwegian Sea combined with corresponding NORA hindcast wave data during nearly 4 years, while Bruserud and Haver [81] used measured wave and current data from the northern North Sea during 4.5 years. In Bruserud [82] the effect of different types of current data combined with measured and hindcast wave data in the northern North Sea during the measurement period of 4.5 years and the NORA10 period of 58.25 year were investigated.…”

Section: Discussionmentioning

confidence: 99%

“…For the N-003 approach, a marginal distribution for Cs has been established by fitting a Weibull 3parameter distribution to the maximum Cs during all the 2800 episodes of wind-generated inertial oscillations, as proposed by Bruserud and Haver [80], Bruserud and Haver [81]. Cs will be given as…”

Section: ) Simulate Csmentioning

confidence: 99%

Joint description of waves and currents applied in a simplified load case

2018

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In order to perform a more accurate analysis of marine structures, joint probability distributions of different metocean parameters have received an increasing interest during the last decade, facilitated by improved availability of reliable joint metocean data. The main objective of this article is twofold; first to establish a joint distribution of significant wave height and current speed and then to assess the possible conservatism in the Norwegian design standard by applying this joint distribution in a simplified load case. As there still seems to be no general consensus with regard to the approach of estimating the joint probability distributions of metocean parameters, a general overview of recent studies exploring different joint models for metocean parameters is first presented. Based on simulated current data and NORA10 wave data, a joint model for significant wave height and current speed at one location in the northern North Sea is presented. Since episodes of wind-generated inertial oscillations is the governing current conditions at this location, a conditional joint model with current speed conditional on significant wave height is suggested. A peak-overthreshold approach is selected and the significant wave height is found to be very well modelled by a 2-parameter Weibull distribution for significant wave height exceeding 8 m, while a log-normal distribution describes the current speed well. This model is used to Monte-Carlo simulate joint significant wave heights and current speeds for periods corresponding to the ultimate and accidental limit states (ULS and ALS), i.e. 100 and 10 000 years. The possible conservatism in the Norwegian design standard is assessed by a simplified case study. The results give a clear indication that the Norwegian design standard in not necessarily conservative, neither at ULS nor ALS level.

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“…In the real marine environment, ocean currents are indeed not uniformly distributed vertically. From the ADCP observation in the northern North Sea, the current direction distribution changes minorly with water depth, but the current velocity decreases with deeper water depth, which indicates a spatial variation in ocean current conditions [28]. Therefore, it is necessary to determine their vertical profiles.…”

Section: Currentsmentioning

confidence: 99%

Developments in Modeling Techniques for Reliability Design of Aquaculture Cages: A Review

Wang,

Ma,

Chu

et al. 2024

JMSE

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Offshore aquaculture is gaining traction due to space limitations in nearshore waters, more pristine water, cooler temperatures, and better waste dispersal. This move has spurred the development of new technologies for offshore aquaculture. Despite the numerous analysis methods for designing aquaculture infrastructure, limitations and challenges remain in modeling the influence of fish cages on flow fields and in addressing fluid–structure interaction. This paper presents a comprehensive review of analysis methods and modeling techniques applied in the design of offshore aquaculture systems, emphasizing the structural reliability analysis. This review includes statistical and predictive analysis of extreme sea conditions, evaluation of environmental loads and hydrodynamic analysis, structural reliability modeling and assessment, and seabed geotechnical responses to mooring anchors. For each design consideration, the relevant theories and applicability are elaborated upon and discussed. This review provides valuable insights for engineers involved in the development and design of offshore aquaculture infrastructure.

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Waves and associated currents–experiences from 5 years metocean measurements in the northern North Sea

Cited by 6 publications

References 35 publications

Probabilistic design and reliability analysis of scour protections for offshore windfarms

Probabilistic design and reliability analysis of scour protections for offshore windfarms

Joint description of waves and currents applied in a simplified load case

Developments in Modeling Techniques for Reliability Design of Aquaculture Cages: A Review

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