Physical modeling of local scour development around a large-diameter monopile in combined waves and current |
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| Institution: | 1. Technical University of Denmark, Department of Mechanical Engineering, Section of Fluid Mechanics, Coastal and Maritime Engineering, DK-2800, Kgs. Lyngby, Denmark;2. Middle East Technical University, Department of Civil Engineering, Ocean Engineering Research Center, Dumlupinar Blvd., 06800, Cankaya, Ankara, Turkey;1. Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China;2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China;3. School of Engineering and Built Environment, Griffith University, Gold Coast Campus, QLD4222, Australia;1. Technical University of Denmark, Department of Mechanical Engineering, Section for Fluid Mechanics, Coastal and Maritime Engineering, Nils Koppels Alle 403, DK-2800 Kgs. Lyngby, Denmark;2. Deltares, Department of Coastal Structures and Waves, Boussinesqweg 1, 2629HV Delft, The Netherlands;1. Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | In most of the previous studies on local scour around pile foundations, wave-induced pore pressure response has not been taken into account. The local-scour and pore-pressure responses around a large-diameter monopile in combined waves and current have been physically modeled with a specially-designed flow–structure–soil interaction flume. In the series of experiments, the time developments of the scour-depth and the pore-pressure in the proximity of the model pile were measured simultaneously. Experimental results indicate that the wave-induced upward seepage under the wave troughs may weaken the buoyant unit weight of the surrounding sand, which brings the sand-bed more susceptible to scouring. The superimposition of the waves on a current has much effect on the time-development of local scour and the resulting equilibrium scour-depth, which is particularly obvious when the sand-bed is in the clear-water regime under the current or waves alone respectively. It is observed that the maximum flow velocity at the boundary layer for the following-current case is larger than that for the opposing-current case, which further results in faster time development of scour depth and greater equilibrium scour depth for the following-current case. |
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