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    Investigation on scour scale of piggyback pipeline under wave conditions

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    Guo_Ocean_Engineering_2.pdf (716.6Kb)
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    Publication date
    2019-06-15
    Author
    Yang, S.
    Shi, B.
    Guo, Yakun
    Keyword
    Piggyback pipeline
    Scour depth
    Scour width
    Gap-ratio
    Spacing
    Wave action
    Rights
    © 2019 Elsevier Ltd. All rights reserved. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    Laboratory experiments are presented to investigate the effect of different piggyback pipeline configurations on the morphology of local scour under wave conditions. Scour depth and width around the pipelines under regular and irregular waves are measured and analyzed for a range of pipeline and wave conditions; such as the spacing between two pipes (G), gap between the main pipe and seabed (e), pipe diameter (D), wave height (H) and period (T). Experimental results reveal that both the scour depth and width around piggyback pipeline is much larger than those around single pipe under the same wave conditions. Scour depth increases with the increase of the Keulegan-Carpenter (KC) number and decreases with increase of G and e. When e exceeds 0.5D, scour depth tends to approach 0.When spacing G is greater than 0.4D, the destabilization from small pipe to large one is greatly reduced, resulting in scour depth around piggyback pipeline being close to that around single pipe. Similar to scour depth, scour width broadens with the increase of KC number increasing and decreases with the increase of G. Experiments also show that the effect of e on scour depth is greater than that of G under the same test conditions, while their impact on scour width is opposite. Furthermore, scour width under irregular waves is extended slightly compared with regular wave for otherwise the identical conditions.
    URI
    http://hdl.handle.net/10454/17149
    Version
    Accepted manuscript
    Citation
    Yang S, Shi B and Guo Y (2019) Investigation on scour scale of piggyback pipeline under wave conditions. Ocean Engineering. 182: 196-202.
    Link to publisher’s version
    https://doi.org/10.1016/j.oceaneng.2019.04.074
    Type
    Article
    Collections
    Engineering and Informatics Publications

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