Irregular wave loads on a gravity based foundation in shallow water

Erik Damgaard Christensen, Iris P. Lohmann, Hans F. Hansen, Piet Haerens, Annelies Demuynck

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

In order to achieve a safe but cost-effective foundation design of offshore structures, it is important to include effects of run-up and wave breaking in the estimation of wave loads on structures in relatively shallow water. This study presents results from a method applied to estimate wave loads on a gravity based foundation (GBF) coming from irregular waves which are potentially subjected to wave breaking. The objective of the study is to analyse the loads on gravity based foundations for wind turbines on the Thornton Bank, Belgium, due to irregular breaking waves. This study focuses on uncertainties in estimation of maximum loads based on the same wave condition, i.e. (Hs, Tp, Wave Spectrum). To this end three different synthetic irregular wave time series elaborated from the same wave condition are used to simulate the wave load on the GBF. The simulations result in time-series of wave loads and wave elevations on the GBF. The loads obtained from the model indicate a small difference (below 10% in peak values) between the wave-induced inline force for the three simulations, and differences up to 15–20% on the peak values of the obtained wave induced overturning moments. From the simulation results it is also possible to investigate flow patterns and run-up around the structure.
Original languageEnglish
Title of host publicationASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
PublisherAmerican Society of Mechanical Engineers
Publication date2011
Pages437-446
ISBN (Print)978-0-7918-4439-7
DOIs
Publication statusPublished - 2011
Externally publishedYes
Event30th International Conference on Ocean, Offshore and Arctic Engineering - Rotterdam, Netherlands
Duration: 19 Jun 201124 Jun 2011
Conference number: 30
https://www.asmeconferences.org/OMAE2011/

Conference

Conference30th International Conference on Ocean, Offshore and Arctic Engineering
Number30
CountryNetherlands
CityRotterdam
Period19/06/201124/06/2011
Internet address

Bibliographical note

©2011 ASME

Cite this

Christensen, E. D., Lohmann, I. P., Hansen, H. F., Haerens, P., & Demuynck, A. (2011). Irregular wave loads on a gravity based foundation in shallow water. In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering (pp. 437-446). American Society of Mechanical Engineers. https://doi.org/10.1115/OMAE2011-49572
Christensen, Erik Damgaard ; Lohmann, Iris P. ; Hansen, Hans F. ; Haerens, Piet ; Demuynck, Annelies. / Irregular wave loads on a gravity based foundation in shallow water. ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2011. pp. 437-446
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abstract = "In order to achieve a safe but cost-effective foundation design of offshore structures, it is important to include effects of run-up and wave breaking in the estimation of wave loads on structures in relatively shallow water. This study presents results from a method applied to estimate wave loads on a gravity based foundation (GBF) coming from irregular waves which are potentially subjected to wave breaking. The objective of the study is to analyse the loads on gravity based foundations for wind turbines on the Thornton Bank, Belgium, due to irregular breaking waves. This study focuses on uncertainties in estimation of maximum loads based on the same wave condition, i.e. (Hs, Tp, Wave Spectrum). To this end three different synthetic irregular wave time series elaborated from the same wave condition are used to simulate the wave load on the GBF. The simulations result in time-series of wave loads and wave elevations on the GBF. The loads obtained from the model indicate a small difference (below 10{\%} in peak values) between the wave-induced inline force for the three simulations, and differences up to 15–20{\%} on the peak values of the obtained wave induced overturning moments. From the simulation results it is also possible to investigate flow patterns and run-up around the structure.",
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Christensen, ED, Lohmann, IP, Hansen, HF, Haerens, P & Demuynck, A 2011, Irregular wave loads on a gravity based foundation in shallow water. in ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, pp. 437-446, 30th International Conference on Ocean, Offshore and Arctic Engineering, Rotterdam, Netherlands, 19/06/2011. https://doi.org/10.1115/OMAE2011-49572

Irregular wave loads on a gravity based foundation in shallow water. / Christensen, Erik Damgaard; Lohmann, Iris P.; Hansen, Hans F.; Haerens, Piet ; Demuynck, Annelies.

ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2011. p. 437-446.

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

TY - GEN

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AU - Haerens, Piet

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N1 - ©2011 ASME

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N2 - In order to achieve a safe but cost-effective foundation design of offshore structures, it is important to include effects of run-up and wave breaking in the estimation of wave loads on structures in relatively shallow water. This study presents results from a method applied to estimate wave loads on a gravity based foundation (GBF) coming from irregular waves which are potentially subjected to wave breaking. The objective of the study is to analyse the loads on gravity based foundations for wind turbines on the Thornton Bank, Belgium, due to irregular breaking waves. This study focuses on uncertainties in estimation of maximum loads based on the same wave condition, i.e. (Hs, Tp, Wave Spectrum). To this end three different synthetic irregular wave time series elaborated from the same wave condition are used to simulate the wave load on the GBF. The simulations result in time-series of wave loads and wave elevations on the GBF. The loads obtained from the model indicate a small difference (below 10% in peak values) between the wave-induced inline force for the three simulations, and differences up to 15–20% on the peak values of the obtained wave induced overturning moments. From the simulation results it is also possible to investigate flow patterns and run-up around the structure.

AB - In order to achieve a safe but cost-effective foundation design of offshore structures, it is important to include effects of run-up and wave breaking in the estimation of wave loads on structures in relatively shallow water. This study presents results from a method applied to estimate wave loads on a gravity based foundation (GBF) coming from irregular waves which are potentially subjected to wave breaking. The objective of the study is to analyse the loads on gravity based foundations for wind turbines on the Thornton Bank, Belgium, due to irregular breaking waves. This study focuses on uncertainties in estimation of maximum loads based on the same wave condition, i.e. (Hs, Tp, Wave Spectrum). To this end three different synthetic irregular wave time series elaborated from the same wave condition are used to simulate the wave load on the GBF. The simulations result in time-series of wave loads and wave elevations on the GBF. The loads obtained from the model indicate a small difference (below 10% in peak values) between the wave-induced inline force for the three simulations, and differences up to 15–20% on the peak values of the obtained wave induced overturning moments. From the simulation results it is also possible to investigate flow patterns and run-up around the structure.

U2 - 10.1115/OMAE2011-49572

DO - 10.1115/OMAE2011-49572

M3 - Article in proceedings

SN - 978-0-7918-4439-7

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BT - ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering

PB - American Society of Mechanical Engineers

ER -

Christensen ED, Lohmann IP, Hansen HF, Haerens P, Demuynck A. Irregular wave loads on a gravity based foundation in shallow water. In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers. 2011. p. 437-446 https://doi.org/10.1115/OMAE2011-49572