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research-article

DETAILED STUDY ON BREAKING WAVE INTERACTIONS WITH A JACKET STRUCTURE BASED ON EXPERIMENTAL INVESTIGATIONS

[+] Author and Article Information
Jithin Jose

Ullandhaug Stavanger, Rogaland 4036 Norway
jithin.jose@uis.no

Olga Podrazka

Al. Marszalka Pilsudskiego 46 81-378 Gdynia Gdynia, 81-378 Poland
olga.podrazka@ug.edu.pl

Ove T. Gudmestad

Ullandhaug Stavanger, Rogaland 4036 Norway
ove.t.gudmestad@uis.no

Witold Cieslikiewicz

Al. Marszalka Pilsudskiego 46 81-378 Gdynia Gdynia, 81-378 Poland
ciesl@ug.edu.pl

1Corresponding author.

ASME doi:10.1115/1.4037829 History: Received April 26, 2017; Revised August 15, 2017

Abstract

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 method, and local slamming forces are obtained by the Frequency Response Function 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 (c) 2017 by ASME
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