Calculation and Simulation of Local Scour of Offshore Wind Power Pile Foundation in the Beibu Gulf of Guangxi
Local scour of offshore wind power pile foundation is an important research content in the design,operation and maintenace of wind farm.The depth and range of scour are complex and changeable due to the actions of superposition of seafloor topography,seabed sediment types,waves and tidal currents.By selecting an offshore wind farm in the Beibu Gulf of Guangxi as the study area,the applicability of the empirical formulas is analyzed and comparied based on the data of seafloor topography,surface sediments and one-year-long in-situ observations of waves and tidal currents,and the formula for local scouring which is suitable for the seabed features in the study area is selected to study the scouring characteristics of the pile foundation under the conditions of different ocean dynamics and different fan layout schemes.The results show that because the seabed sediments in the engineering area of the study area are mainly composed of silty sand,the Wang Rukai formula of the empirical formulas is recommended to be used for calculatng the local scour.Considering the reduction coefficient of the reciprocating tidal flow to the unidirectional flow,the maximum scouring depth of the representative pile foundation of the wind farm ranges from 5.86 m to 6.88 m and the scouring radius is 14.15 to 15.91 m.To reflect the specific geometric patterns of the pile foundation in the offshore wind farm,a numerical model is established for sediment movement and seabed scour of the pile foundation and verfied by hydrological and scouring parameters.Through carrying out erosion and siltation simulation for three fan layout schemes of 12.5,13.7 and 14.0 MW,the scouring characteristics of the pile foundation under the case of these fan layout schemes are analyzed and comparied respectively,indicaing that the fan layout scheme of 14.0 MW is the recommended scheme.
offshore wind power farmpile foundationlocal scour depthfan layout scheme
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