JOURNAL OF NATURAL RESOURCES ›› 2014, Vol. 29 ›› Issue (6): 1029-1042.

• Resources Evaluation •

### WRF 3DVAR Data Assimilation Numerical Simulation and Analysis ofWind Energy Resources over Bohai Sea Region

DONG Xu-guang1, MENG Xiang-xin1, XU Hong-xiong2, CHEN Yan-chun1, LIU Huan-bin1

1. 1. Shandong Climate Center, Jinan 250031, China;
2. Chinese Academy of Meteorological Sciences, Beijing 100081, China
• Received:2013-04-17 Revised:2014-01-17 Published:2014-06-24

Abstract:

From the view of improving initial conditions of wind energy resources over Bohai Sea region and using the data of wind tower network over the same region, a 3DVAR data assimilation scheme is designed based on WRF model and its 3DVAR module. By using this scheme, a series of WRF numerical experiments of a strong wind event over the Bohai Sea from 12 to 13 April, 2010 was conducted to evaluate its performance. By selecting the optimal 3DVAR assimilation scheme, one year's WRF numerical simulation of 70 m height wind energy resources over Bohai Sea region between June 1, 2009 to May 31, 2010 was conducted. The results show that the annual average wind speed between measured values and analog values can obviously decrease by using YSU PBL scheme. The optimal WRF numerical model and 3DVAR assimilation can simulate the change regulation of the 70 m height hourly average wind speed in Bohai Sea region. The absolute error and relative error of average wind speed after wind tower data assimilation are smaller than before its assimilation and simulation of hourly wind speed approach observation. The annual average wind speed difference between simulation and observation of each wind tower is no more than 1.5 m/s and wind speed difference of eight wind towers is over 1.0 m/s, meanwhile wind speed difference of more than ten wind towers are below 0.5 m/s. The relative error of annual average wind speed between simulation and observation of all wind towers is 11.3%, of which 12 wind towers'are below 10.0% and three wind towers' are over 20.0%. The 70 m height annual average wind speed and wind power density over Bohai Sea region are showed small in southern part and large in the northern and the wind energy resources of central and northern Bohai Sea are higher than others. The wind speed trends is smaller in Bohai Sea but the inland wind speed affected by terrain changes dramatically. Distribution of the wind energy parameter is obviously affected by coastline and it decreases sharply along inland direction.

CLC Number:

• TK81