This paper provides a method by which the scour depth below pipelines and around single vertical piles for combined random waves plus current including effects of second-order wave asymmetry can be derived. Here the empirical formulas proposed by Sumer and Fredsöe (1996. Scour below pipelines in combined waves and current. In: Proceedings of the 15th OMAE Conference, Florence, Italy. Vol. 5, ASME, New York, pp. 595-602) for pipelines, and by Sumer and Fredsöe (2002. The mechanics of scour in the marine environment. World Scientific, Singapore) for vertical piles are used together with Stokes second-order wave theory by assuming the basic harmonic wave motion to be a stationary Gaussian narrow-band random process. Comparisons are made with the Sumer and Fredsöe (1996. Scour below pipelines in combined waves and current. In: Proceedings of the 15th OMAE Conference, Florence, Italy. Vol. 5, ASME, New York, pp. 595-602; 2001. Scour around pile in combined waves and current. Journal of Hydraulic Engineering, 127(5), 403-411) data for linear random waves plus current. An example of calculation is also presented.


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    Title :

    Scour below pipelines and around vertical piles due to second-order random waves plus a current


    Additional title:

    Unterspülung unter Rohrleitungen und um vertikale Pfähle (Pfeiler) durch zufällige Wellen zweiter Ordnung plus einer Strömung


    Contributors:

    Published in:

    Ocean Engineering ; 36 , 8 ; 605-616


    Publication date :

    2009


    Size :

    12 Seiten, 21 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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