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Experimental investigation on scour development and scour protection for offshore converter platform |
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| Affiliation: | 1. Ocean College, Zhejiang University, Zhoushan, 316021, PR China;2. Hainan Institute, Zhejiang University, Sanya, 572025, PR China;1. School of Civil Engineering, Sun Yat-Sen University, Guangzhou, China;2. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China;3. Architectural Design and Research Institute, South China University of Technology, Guangzhou, China;4. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;1. China Communication Construction Corporation Third Harbor Engineering Corporation Limited, Shanghai, 200032, China;2. Key Laboratory of Performance Evolution and Control for Engineering Structures (Ministry of Education), Tongji University, Shanghai, 200092, China;1. National Centre for Maritime Engineering and Hydrodynamics, Australian Maritime College, University of Tasmania, Launceston, Tasmania, Australia;2. NavTec Pty Ltd, Perth, Western Australia, Australia |
| Abstract: | Local scour around the offshore converter platform caused by current and wave will lead to the instability of foundation. A series of experiments are performed to investigate the scour development and scour protection of the offshore converter platform. The development and evolution characteristics of the local scour around the gravity based structure foundation under the actions of current flow and wave are analyzed. The results show that the edge scour mainly occurs at the lateral sides of the platform and the scour pits are symmetrical about the centerline of the platform in the streamwise flow direction. The scour depth around the gravity based structure increases with the increase of flow velocity. The inclination and collapse of the platform is observed at α = 90° and U0 = 0.25 m/s. The sand ripples are observed around the gravity based structure under the wave action, and the scour depth increases with the increase of wave height and wave period. Based on the comparisons of different scour protection methods, the combined bionic grass-geotextile-riprap protection has the best scour protection efficiency for the offshore converter platform. |
| Keywords: | Offshore converter platform Gravity based structure Current flow and wave action Scour development Scour protection |
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