3D scour below pipelines under waves and combined waves and currents |
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| Institution: | 1. School of Civil and Resource Engineering, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;2. Institute of Mechanics, Chinese Academy of Sciences, 15 Beisihuanxi Road, Beijing 100190, China;3. Stake Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;4. Department of Transport, 1 Essex Street, Fremantle, WA 6160, Australia;1. Technical University of Denmark, Department of Mechanical Engineering, DK-2800 Kgs. Lyngby, Denmark;2. Deltares, Department of Coastal Structures and Waves, Rotterdamseweg 185, 2629 HD Delft, The Netherlands;1. School of Engineering, Ocean University of China, no.238 Songling Road, Qingdao, Shandong, China;2. School of Civil, Environmental and Mining Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;3. Centre for Offshore Foundation Systems, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;1. Centre for Offshore Foundation Systems, The University of Western Australia, Crawley, WA 6009, Australia;2. School of Civil, Environmental and Mining Engineering, The University of Western Australia, Crawley, WA 6009, Australia;3. Marine Ecology Group, The UWA Oceans Institute & School of Plant Biology, Crawley, WA 6009, Australia;4. Shell EMI Chair of Offshore Engineering, The University of Western Australia, Crawley, WA 6009, Australia |
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| Abstract: | This paper presents the results of an experimental investigation on three-dimensional local scour below a rigid pipeline subjected to wave only and combined wave and current conditions. The tests were conducted in a conventional wave flume. The major emphasis of the investigation was on the scour propagation speed (free span expansion rate) along the pipeline after local scour was initiated at a controlled location. The effects of flow ratio (steady current velocity vs. combined waves/current velocity), flow incidence angle and pipeline initial embedment depth on free span expansion rate were investigated. It was observed that the scour along the pipeline propagated at a constant rate under wave only conditions. The scour propagation rate decreased with increasing embedment depth, however, increased with the increasing Keuglegan–Carpenter (KC) number. Under combined wave and current conditions, the effect of velocity ratio on scour propagation velocity along the pipeline was quantified. Empirical relationships between the scour propagation rate (Vh) and key parameters such as the KC number and embedment depth (e/D) were established based on the testing results. |
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