0
Research Papers: Offshore Technology

Detailed Study on Breaking Wave Interactions With a Jacket Structure Based on Experimental Investigations

[+] Author and Article Information
Jithin Jose

Department of Mechanical and Structural
Engineering and Materials Science,
University of Stavanger,
Ullandhaug,
Stavanger 4036, Rogaland, Norway
e-mail: jithin.jose@uis.no

Olga Podrażka

Institute of Oceanography,
University of Gdańsk,
Al. Marszałka Piłsudskiego 46,
Gdynia 81-378, Poland
e-mail: olga.podrazka@ug.edu.pl

Ove Tobias Gudmestad

Department of Mechanical and Structural
Engineering and Materials Science,
University of Stavanger,
Ullandhaug,
Stavanger 4036, Rogaland, Norway
e-mail: ove.t.gudmestad@uis.no

Witold Cieślikiewicz

Institute of Oceanography,
University of Gdańsk,
Al. Marszałka Piłsudskiego 46,
Gdynia 81-378, Poland
e-mail: ciesl@ug.edu.pl

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 April 26, 2017; final manuscript received August 15, 2017; published online October 11, 2017. Assoc. Editor: Xi-Ying Zhang.

J. Offshore Mech. Arct. Eng 140(2), 021301 (Oct 11, 2017) (14 pages) Paper No: OMAE-17-1065; doi: 10.1115/1.4037829 History: Received April 26, 2017; Revised August 15, 2017

Wave breaking is one of the major concerns for offshore structures installed in shallow waters. Impulsive breaking wave forces sometimes govern the design of such structures, particularly in areas with a sloping sea bottom. Most of the existing offshore wind turbines were installed in shallow water regions. Among fixed-type support structures for offshore wind turbines, jacket structures have become popular in recent times as the water depth for fixed offshore wind structures increases. However, there are many uncertainties in estimating breaking wave forces on a jacket structure, as only a limited number of past studies have estimated these forces. Present study is based on the WaveSlam experiment carried out in 2013, in which a jacket structure of 1:8 scale was tested for several breaking wave conditions. The total and local wave slamming forces are obtained from the experimental measured forces, using two different filtering methods. The total wave slamming forces are filtered from the measured forces using the empirical mode decomposition (EMD) method, and local slamming forces are obtained by the frequency response function (FRF) method. From these results, the peak slamming forces and slamming coefficients on the jacket members are estimated. The breaking wave forces are found to be dependent on various breaking wave parameters such as breaking wave height, wave period, wave front asymmetry, and wave-breaking positions. These wave parameters are estimated from the wave gauge measurements taken during the experiment. The dependency of the wave slamming forces on these estimated wave parameters is also investigated.

Copyright © 2018 by ASME
Topics: Waves
Your Session has timed out. Please sign back in to continue.

References

Goda, Y. , Haranaka, S. , and Kitahata, M. , 1966, “ Study of Impulsive Breaking Wave Forces on Piles,” Rep. Port Harbor Res. Inst., 5(6), pp. 1–30.
Arntsen, Ø. A. , Ros, X. , and Tørum, A. , 2011, Impact Forces on a Vertical Pile From Plunging Breaking Waves, World Scientific, Singapore, pp. 533–544.
Chaplin, J. , Flintham, T. , Greated, C. , and Skyner, D. , 1992, “ Breaking Wave Forces on a Vertical Cylinder,” Health and Safety Executive, London, Technical Report No. OTH 90 324.
Goda, Y. , 1973, “ Wave Forces on Circular Cylinders Erected Upon Reefs,” Coastal Eng. Jpn., 16, pp. 137–146.
Sawaragi, T. , and Nochino, M. , 1984, “ Impact Forces of Nearly Breaking Waves on Vertical Circular Cylinder,” Coastal Eng. Jpn., 27, pp. 249–263.
Irschik, K. , Sparboom, U. , and Oumeraci, H. , 2004, “ Breaking Wave Loads on a Slender Pile in Shallow Water,” 29th International Conference on Coastal Engineering, Lisbon, Portugal, Sept. 19–24, pp. 568–580.
Wienke, J. , and Oumeraci, H. , 2005, “ Breaking Wave Impact Force on a Vertical and Inclined Slender Pile-Theoretical and Large-Scale Model Investigations,” Coastal Eng., 52(5), pp. 435–462. [CrossRef]
ABS, 2011, “ Design Standards for Offshore Wind Farms,” American Bureau of Shipping, Houston, TX, Contract No. M10PC00105.
Sarpkaya, T. , 1978, “ Wave Impact Loads on Cylinders,” Offshore Technology Conference (OTC), Houston, TX, May 8–11, SPE Paper No. SPE-7216-PA.
Sawaragi, T. , and Nochino, M. , 1984, “ Impact Forces of Nearly Breaking Waves on a Vertical Circular Cylinder,” Coast. Eng. Jpn., 27, pp. 249–263.
Tanimoto, K. , Takahashi, S. , Kaneko, T. , and Shiota, K. , 1986, “ Impulsive Breaking Wave Forces on an Inclined Pile Exerted by Random Waves,” 20th International Conference on Coastal Engineering, Taipei, Taiwan, Nov. 9–14, pp. 2288–2302.
Arntsen, Ø. A. , Obhrai, C. , and Gudmestad, O. T. , 2013, “ Data Storage Report: Wave Slamming Forces on Truss Structures in Shallow Water,” Norwegian University of Science and Technology and University of Stavanger, Stavanger, Norway, Technical Report No. HyIV-FZK-05.
Arntsen, Ø. A. , and Gudmestad, O. T. , 2014, “ Wave Slamming Forces on Truss Structures in Shallow Water,” HYDRALAB IV Joint User Meeting, Lisbon, Portugal, July 2–4.
Jose, J. , Podrażka, O. , Gudmestad, O. T. , and Cieślikiewicz, W. , 2017, “ Characteristics of the Wave Slamming Forces on Jacket Structures Under Plunging Breaking Waves Based on Experimental Data,” International Conference on Ocean, Offshore and Arctic Engineering, Trondheim, Norway, June 25–30.
Jose, J. , Podrażka, O. , Obhrai, C. , Gudmestad, O. T. , and Cieślikiewicz, W. , 2015, “ Experimental Analysis of Slamming Loads for Truss Structures Within the Framework of WaveSlam Project,” HYDRALAB IV, Lisbon, Portugal, July 2–4.
Jose, J. , Podrażka, O. , Obhrai, C. , Gudmestad, O. T. , and Cieślikiewicz, W. , 2016, “ Methods for Analysing Wave Slamming Loads on Truss Structures Used in Offshore Wind Applications Based on Experimental Data,” Int. J. Offshore Polar Eng., 26(2), pp. 100–108. [CrossRef]
Jose, J. , Choi, S. J. , Lee, K. H. , and Gudmestad, O. T. , 2016, “ Breaking Wave Forces on an Offshore Wind Turbine Foundation (Jacket Type) in the Shallow Water,” International Ocean and Polar Engineering Conference (ISOPE), Rhodes, Greece, June 26–July 2, SPE Paper No. ISOPE-I-16-157.
Jose, J. , and Choi, S. J. , 2017, “ Estimation of Slamming Coefficients on Local Members of Offshore Wind Turbine Foundation (Jacket Type) Under Plunging Breaker,” Int. J. Nav. Arch. Ocean, epub.
Chella, M. A. , Bihs, H. , and Myrhaug, D. , 2015, “ Characteristics and Profile Asymmetry Properties of Waves Breaking Over an Impermeable Submerged Reef,” Coastal Eng., 100, pp. 26–36. [CrossRef]
Stansberg, C. T. , 2008, “ A Wave Impact Parameter,” ASME Paper No. OMAE2008-57801.
Peng, Z. , 2014, “ Wave Slamming Impact on Offshore Wind Turbine Foundations,” 34th International Conference on Coastal Engineering (ICCE), Seoul, South Korea, June 15–20, pp. 43–50.
Määttänen, M. , 1979, “ Laboratory Tests for Dynamic Ice Structure Interaction,” Eng. Struct., 3(2), pp. 111–116. [CrossRef]
Tørum, A. , 2013, “ Analysis of Force Response Data From Tests on a Model of Truss Structure Subjected to Plunging Breaking Waves,” Norwegian University of Science and Technology, Trondheim, Norway, Report No. NTNU-IBAT/MB TN.
Massel, S. R. , 1996, Ocean Surface Waves: Their Physics and Prediction, World Scientific, Singapore.
Soares, C. G. , Cherneva, Z. , and Antao, E. M. , 2004, “ Steepness and Asymmetry of the Largest Waves in Storm Sea States,” Ocean Eng., 31(8–9), pp. 1147–1167. [CrossRef]

Figures

Grahic Jump Location
Fig. 1

Schematic representation of experimental setup: (a) side view and (b) top view

Grahic Jump Location
Fig. 2

Experimental setup—jacket structure in the wave tank

Grahic Jump Location
Fig. 3

Locations of the force transducers (FTLF01–FTLF10, FTTF01–FTTF04, and FTBF01–FTBF12) and the dimensions of the truss structure in mm [16]

Grahic Jump Location
Fig. 6

Definition sketch of wave front asymmetry [21,25]

Grahic Jump Location
Fig. 7

Water surface elevation changes for wave case 2Ac (Note that wave gauges WG S9 to WG S11 are placed along the side of the jacket)

Grahic Jump Location
Fig. 8

Wave height changes along the flume for wave case 2Ac

Grahic Jump Location
Fig. 9

Wave front asymmetry changes along the flume for wave case 2Ac

Grahic Jump Location
Fig. 10

Breaking wave height and wave-breaking position for different wave cases: (a) cases 1A–1C, (b) cases 2A–2C, and (c) cases 3A–3C

Grahic Jump Location
Fig. 11

Total force transducers connections for measuring total wave force on the jacket structure

Grahic Jump Location
Fig. 12

Variation of peak total slamming force for five different wave samples for all the cases: (a) cases 1A–1C, (b) cases 2A–2C, and (c) cases 3A–3C

Grahic Jump Location
Fig. 13

Filtered total force time series for wave case 2Cc

Grahic Jump Location
Fig. 14

Local force measured on the bracing force transducers for wave case 2Cc

Grahic Jump Location
Fig. 15

Peak wave slamming force on the bracing members FTBF01 to 04 for wave case 1: (a) wave case 1A, (b) wave case 1B, and (c) wave case 1C

Grahic Jump Location
Fig. 16

Peak wave slamming force on the bracing members FTBF01 to 04 for wave case 2: (a) wave case 2A, (b) wave case 2B, and (c) wave case 2C

Grahic Jump Location
Fig. 17

Peak wave slamming force on the bracing members FTBF01 to 04 for wave case 3: (a) wave case 3A, (b) wave case 3B, and (c) wave case 3C

Grahic Jump Location
Fig. 18

Filtered local force time series measured by bracing transducer FTBF04 for wave case 2Cc

Grahic Jump Location
Fig. 19

Impact area of the bracing force transducers

Grahic Jump Location
Fig. 20

Slamming coefficient estimated on the bracing members FTBF01 to 04: (a) wave case 1A, (b) wave case 1B, and (c) wave case 1C

Grahic Jump Location
Fig. 21

Slamming coefficient estimated on the bracing members FTBF01 to 04: (a) wave case 2A, (b) wave case 2B, and (c) wave case 2C

Grahic Jump Location
Fig. 22

Slamming coefficient estimated on the bracing members FTBF01 to 04: (a) wave case 3A, (b) wave case 3B, and (c) wave case 3C

Grahic Jump Location
Fig. 23

Dependency between breaking wave height and total slamming force for wave cases 1A–1C

Grahic Jump Location
Fig. 24

Dependency between wave front asymmetry (ηf/λf) and total slamming force for wave cases 1A–1C

Grahic Jump Location
Fig. 25

Dependency between breaking wave height and total slamming force for wave cases 2A–2C

Grahic Jump Location
Fig. 26

Dependency between wave front asymmetry (ηf/λf) and total slamming force for wave cases 2A–2C

Grahic Jump Location
Fig. 27

Dependency between breaking wave height and total slamming force for wave cases 3A–3C

Grahic Jump Location
Fig. 28

Dependency between wave front asymmetry (ηf/λf) and total slamming force for wave cases 3A–3C

Grahic Jump Location
Fig. 29

Dependency between wave front asymmetry and local slamming force on FTBF01 to 04 for wave cases 1A–1C: (a) FTBF01, (b) FTBF02, (c) FTBF03, and (d) FTBF04

Grahic Jump Location
Fig. 30

Dependency between wave front asymmetry and local slamming force on FTBF01 to 04 for wave cases 2A to 2C: (a) FTBF01, (b) FTBF02, (c) FTBF03, and (d) FTBF04

Grahic Jump Location
Fig. 31

Dependency between wave front asymmetry and local slamming force on FTBF01 to 04 for wave cases 3A to 3C: (a) FTBF01, (b) FTBF02, (c) FTBF03, and (d) FTBF04

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In