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The Local Scour around Submarine Pipelines in the Interaction Region Combined with Waves and Currents  

Kim, Kyoung-Ho (School of Civil Engineering, Chungbuk National Univ.)
Lee, Ho-Jin (Dept. of Civil Engineering, Gangwon Provincial coll)
Kim, Wan-Shik (Hong-ik Engineering & Consultants Co. LTD)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.20, no.5, 2008 , pp. 510-521 More about this Journal
Abstract
In the study, experiments are performed in the interaction region combined with wave and current to investigate the characteristics of local scour around submarine pipelines. Wave generator and current generator are used for the experiments and two current directions were used; co-direction and counter direction to the wave. The local scour depths around the pipeline are obtained according to the various pipe diameters(D), wave periods(T), wave heights(H), and current velocities(V). The experiments show that the maximum equilibrium local scour depth increases with pipe diameter, wave period, wave height, and current velocity. Using the experimental results, the correlations of scour depth and parameters such as Shields parameter($\theta$), Froude number(Fr), period parameter, Keulegan-Carpenter number(KC), Ursell number($U_R$), modified Ursell number($U_{RP}$) and ratio of velocities($U_{c}/(U_{c}+U_{m})$) are analyzed. In the interaction region combined with waves and currents, Froude number and Shields parameter are found the main parameters to cause the local scour around the submarine pipelines and this means that current governs the scour within any limits of the currents.
Keywords
Local scour; Shields parameter($\theta$); Froude number(Fr); Keulegan-Carpenter number(KC); modified Ursell number($U_{RP}$);
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