资源科学 ›› 2017, Vol. 39 ›› Issue (7): 1349-1360.doi: 10.18402/resci.2017.07.12

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山地复杂条件下三种边界层参数化方案对近地层风模拟精度初步评估分析

穆清晨1,2(), 王咏薇1,2(), 邵凯3, 王恪非1,2, 高雅琪1,2   

  1. 1. 南京信息工程大学大气环境中心,南京 210044
    2. 南京信息工程大学大气物理学院,南京 210044
    3. 金风科技股份有限公司,北京 100176
  • 收稿日期:2016-12-10 修回日期:2017-05-05 出版日期:2017-07-20 发布日期:2017-07-20
  • 作者简介:

    作者简介:穆清晨,女,吉林白山人,硕士生,主要研究WRF参数化方案对风速预测影响。E-mail:muqc61@yahoo.com

  • 基金资助:
    国家自然科学基金面上项目(41575009);江苏高校优势学科建设工程项目(PAPD);江苏省产学研前瞻性项目(BY2015070-15)

Three planetary boundary layer parameterization schemes for the preliminary evaluation of near surface wind simulation accuracy over complex terrain

Qingchen MU1,2(), Yongwei WANG1,2(), Kai SHAO3, Kefei WANG1,2, Yaqi GAO1,2   

  1. 1. Yale-NUIST Center on Atmospheric Environment,Nanjing University of Information Science and Technology,Nanjing 210044,China
    2. Nanjing University of Information Science and Technology,Atmospheric Physics Institute,Nanjing 210044,China
    3. Goldwind Science and Technology Co. Ltd.,Beijing 100176,China
  • Received:2016-12-10 Revised:2017-05-05 Online:2017-07-20 Published:2017-07-20

摘要:

中国风能资源丰富,风能开发行业逐步发展,风速预报的准确性是关键问题。数值模式中,边界层参数化方案对地表热力及动力强迫引发的大气湍流特征的合理计算对于复杂地形条件下小尺度局地风速的预报十分重要。本文选取MYJ、YSU、ACM2三种边界层参数化方案模拟2010年贵州韭菜坪复杂地形条件下的近地层风以检验风速模拟性能。结果表明,在中国西南复杂山地地形条件下,由于计算机理包含非局地闭合的大尺度涡动对运动的影响,ACM2方案对近地层70m高度风速的模拟效果优于其余两种方案,2010年4月逐小时模拟结果与观测结果的均方根误差为3.56m/s,一致性指数为0.94。对风向的模拟三种方案结果相近,但与实测风向的误差随着高度不断减小,70m的模拟结果优于10m。采用威布尔概率密度函数估算平均风能密度,在不同高度上结果稍有差异,但在50m和70m(风机轮毂高度)高度上ACM2方案更优。

关键词: WRF模式, 风速模拟, 边界层参数化方案, 山地地形

Abstract:

China is rich in wind energy resources and its wind power development industry has gradually matured. The accuracy of wind speed prediction remains a key problem for the sector. Planetary boundary layer parameterization schemes for numerical models are very important to small scale wind speed forecasting over complex terrain because of rational calculating the atmospheric turbulence characteristics caused by surface thermodynamics and dynamic forces. Here we selected three kinds of planetary boundary layer schemes(MYJ,YSU and ACM2)to simulate Guizhou Jiucaiping in April 2010 for near-ground wind velocity at mountain underlying conditions of complex topography to test simulation performance. We found that under complex mountainous terrain in southwest China the ACM2 scheme simulation of nearly instantaneous wind speed is better than the two other schemes at a height of 70m,due to the calculation mechanism contains the local closure of large scale vortex effect on movement. The simulation results of ACM2 and observations one by one hour root mean square error is 3.56ms-1and the consistency index is 0.94 in April 2010. The wind direction simulation results of the three scheme were very similar,but as height increased the error between simulations and observations of wind direction decreased. The simulation results for wind direction at a height of 70m is better than the result at 10 m. In order to estimate average wind energy density we used the Weibull probability density function to calculate wind energy. Results show that average wind energy density varies at different heights,but at 50m and 70m (the general wind turbine height)the ACM2 scheme performs better.

Key words: WRF model, simulation of wind velocity, PBL schemes, mountain topography