应用MM5模式对地面大风过程的模拟试验

Simulation Experiments on SurfaceGale Process with MM5 Model

用MM5模式对2 0 0 1年4月1 7～1 9日、5月1 2～1 5日辽宁省出现的大风过程进行了模拟,并与1 3个代表点的气象观测站资料或野外风电场测风资料作了对比。结果表明:模式能较好地模拟区域风场的演变和分布特征;对逐时风速的模拟与实况有一定差异,但模拟值与实况变化比较同步,基本反映出单点风速变化的趋势;对瞬时风速大于1 0m·s-1和平均风速大于9 0m·s-1的模拟明显偏小。模拟试验初步说明,MM5模式对区域地面风场形势、单点风速随时间变化特征的模拟较好,但可能减弱大风的实际强度。

Two surface gale events happened in April 17-19 and May 12-14 of 2001 over Liaoning Province are simulated using MM5 model, and the results are compared with wind observation data at 13 sites (meteorological stations and wind farms). The main experiment results are as follows. The model has good quality in simulating the evolution and distribution characters of regional wind fields. The variation trends of wind speed in every hour are nearly the observations, but there are certain differences in values. When instantaneous (average) wind speed is more than 10.0m·s -1 (9.0m·s -1 ), the simulation values are lower obviously than the observational data. The preliminary experiments show that MM5 model has better ability to simulate patterns of regional wind fields and local variation characters in every hour, but the intensity of heavy wind speed is decreased.