Hydraulic behaviour of a pontoon under wave loading

Pickett, Nathanael (2016) Hydraulic behaviour of a pontoon under wave loading. BEng dissertation, University of Portsmouth.

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    Abstract

    An original experimental method investigating the hydraulic behaviour of a pontoon under wave loading. The project sets out to understand the dynamic wave loading on a floating structure, the effect of a floating pontoon on the wave climate either side of it, and to compare data gathered from flumes of differing size.
    Floating structures are used for a variety of purposes in coastal and ocean construction (Russelll & Thrall, 2013), a more recent application of pontoons used in civil engineering is the SR 520 Bridge that spans Lake Washington (Evans, 2013).
    Previous research into floating structures includes investigations into the hydroelastic response of floating structures (Takagi & Kohara, 2000) (Papaioannnou et al., 2013) (Li et al., 2014). Further studies into wave loading on to structures has been undertaken by Alkhalidi, et al. (2015), and research into prediction of wave interaction with floating structures by Lu & Wang (Lu & Wang, 2015).
    The experimental method uses two flumes varying in size, the first the Armfield C4 Mk2 Water Flume (Armfield Ltd., 2015) and the second the Armfield S6 Mk2 Water Flume (Armfield Ltd., 2012). Using two wave gauges, one up stream and one downstream, it was possible to measure the phenomena referred to as wave shadowing.
    The pontoon used in the larger flume had pressure tapping built in to the upstream and downstream faces that were connected to a manometer. Analysis of the results gathered from the two flumes showed that for wave frequencies of approximately 1Hz and above wave shadowing occurs. In addition data from the large flume when this occurs shows reduction of the peak pressure but increases in wave power due to increased wave period. With increased wave height the wave power and peak pressure increases, these are also affected by wave frequency.

    Item Type: Dissertation
    Departments/Research Groups: Faculty of Technology > School of Civil Engineering and Surveying
    Depositing User: Beth Atkins
    Date Deposited: 01 Sep 2016 13:32
    Last Modified: 01 Sep 2016 13:32
    URI: http://eprints.port.ac.uk/id/eprint/21677

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