近海风电场风机基础局部冲刷估算

Estimation of Local Scour around Wind Turbine's Base of Offshore Wind Farm

建设近海风电场时,风机所处的海洋环境十分复杂,在复杂的气象水文条件影响下,风机基础周围会出现冲刷坑,进而影响风机基础的稳定。所以,风机基础的局部冲刷深度是工程设计的重要参数。采用埕岛油田海洋平台基础局部冲刷现场观测资料,对国内常用的两个计算基础局部冲刷深度的经验公式(韩海骞公式和王汝凯公式)进行验证,发现该海域波浪对泥沙的作用不可忽略。运用波流合成速度代替纯潮流速度,改进的韩海骞公式计算结果与实测值吻合良好。最后,对与埕岛油田海域环境相似的拟建的风电场工程风机基础的局部冲刷深度进行了计算,计算结果对实际工程具有一定的参考价值。

When building the offshore wind farm, the wind turbine＇s marine environment is very complex. Scour hole around wind turbine＇s base will form because of complex meteorology and hydrology factors＇ influence. Thereby, it will affect the stability of wind turbine＇s base. So, the local scour depth of wind turbine is an important parameter for engineering design. We use the field observed data of Chengdao oil field＇s pile to test domestic two commonly used empirical formulas （HAN Hai-qian＇s formula and WANG Ru-kai＇s formula）, and we find that the role of wave on sand can not be ignored in the area. And then, we use the synthesis speed of wave and current instead of the pure tidal current speed, and we can find that the result by the improved HAN Hai-qian＇s formula is in good agreement with the measured resuh. At last, we calculate the local scour depth of wind turbine of the proposed wind farm which has a similar marine environment to Chengdao oil field. The results have some reference value to the actual project.