广西北部湾海上风电桩基局部冲刷计算与模拟研究  

Calculation and Simulation of Local Scour of Offshore Wind Power Pile Foundation in the Beibu Gulf of Guangxi

作　　者：汪睿 程高翔 白治军 孙莉 王振豪 王辉武 WANG Rui;CHENG Gaoxiang;BAI Zhijun;SUN Li;WANG Zhenhao;WANG Huiwu(PowerChina Zhongnan Engineering Corporation Limited,Changsha 410014,China;CGN New Energy Investment(Shenzhen)Co.,LTD.Guangxi Branch,Nanning 530000,China;First Institute of Oceanography,MNR,Qingdao 266061,China)

机构地区：[1]中国电建中南勘测设计研究院有限公司,湖南长沙410014 [2]中广核新能源投资(深圳)有限公司广西分公司,广西南宁530000 [3]自然资源部第一海洋研究所,山东青岛266061

出　　处：《海岸工程》2024年第4期273-284,共12页Coastal Engineering

摘　　要：海上风电场桩基局部冲刷是风电场设计和运维的重要研究内容,其冲刷深度和冲刷半径受海底地形、底质类型和波浪及潮流叠加作用而复杂多变。本文选取广西北部湾某拟建风电场为研究区,基于海底地形地貌、表层沉积物和周年波浪及潮流现场观测数据,对比分析各桩基局部冲刷经验公式的适用性,并选择适用于本海域底床特征的公式分析研究风电场桩基在不同海洋动力条件和风机布置方案条件下的冲刷特征。结果表明,工程海域的海床底质主要为粉砂质砂,推荐采用王汝凯公式进行局部冲刷的经验公式计算。考虑往复流对单向流的折减系数,风电场代表桩基的最大冲刷深度为5.86~6.88 m,冲刷半径为14.15~15.91 m。基于本工程风机基础的具体几何形态,建立了风机基础的泥沙运动和海床冲淤数学模型,对场址内12.5、13.7及14.0 MW三种风机布置方案开展了冲淤模拟,对比分析了3种风机布置情况下的冲刷特征,比选给出14.0 MW风机布置方案为推荐方案。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.

关 键 词：海上风电 桩基 局部冲刷深度 风机布置方案 

分 类 号：TV92[水利工程—水利水电工程]