ICCE 2018 Cover Image

Supplementary Files

Conference Presentation File

How to Cite

Pawitan, K. A., Gossling, B., Allsop, W., & Bruce, T. (2018). VIOLENT IN-CHAMBER LOADS IN AN OSCILLATING WATER COLUMN CAISSON. Coastal Engineering Proceedings, 1(36), structures.11.


In 2009, four of 16 chambers in the Mutriku breakwater-integrated Oscillating Water Column (OWC) were badly damaged by storms, probably due to breaking wave loads, and slam within the chamber. To minimize exposure of future plant to such risks, it is necessary to characterise wave conditions under which such an installation could experience impact loads. This characterisation can be crucial to controling the power-take off resistance to increase the survability of the device during extreme weather. Large scale physical model tests in the Grosse Wellenkanal (GWK) included a video camera installed inside the chamber facing the rear chamber wall. Pressure sensors in the ceiling of the chamber were utilised to quantify the water loads. In-chamber impact pressures of up to 8 ÏgH were recorded on the chamber ceiling, associated with the 'sloshing' observed. The "sloshing† phenomenon is not uncommon and should be considered in design processes.


Muller, Whittaker (1995), Visualisation of flow conditions inside shoreline wave power-station, Ocean Eng, 22, 6, 629-641

Medina-Lopez, Allsop, Dimakopoulos, Bruce (2015), Conjectures on the Failure of the OWC Breakwater at Mutriku, Proc. Coastal Structures 2015, ASCE

Viviano, Naty, Foti, Bruce, Allsop, Vicinanza (2016), Large-scale expts on the behaviour of a generalized OWC under random waves, Ren.Energy, 99, 875-887

Takahashi, S., 1989. Hydrodynamic characteristics of wave-power-extracting caisson breakwater. In Coastal Engineering 1988 (pp. 2489-2503).

Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.