The Simulation And Analysis Of Wind Characteristics Near Surface Layer In Jiuquan With WRF

In this study, the wind characteristics near surface layer in Jiuquan are analyzed by using wind data from November2009to October2010. The wind field in August2010in Jiuquan is simulated with WRF. Two different planetary boundary layer scheme are compared in simulation experiment, and the possible reason of the simulation errors are analyzed.The analysis of wind characteristics of near surface layer in Jiuquan show:1) The variation characteristics of wind speed in each height are similar;2) The maximum value of wind speed near surface layer occurred in August2010, and the minimum value occurred in December2012;3) The daily variation characteristics of wind speed near surface layer are remarkable;4) The mean wind profile near surface layer increases with the height increasing, and it increases faster in night than daytime;5) The difference of the wind speeds between the highest layer and the lowest layer are larger in winter than in summer;6) Considering the vertical shear of the wind near surface layer, its daily variation characteristics is remarkable. The biggest value occurs in the layer close to the ground, while the smallest value occurs in a middle layer;7) In Summer, the dominant wind directions are mostly east. While in winter, the dominant wind directions are mostly east and west.8) There are large seasonal differences of wind speed and wind direction.The simulation results show that both MYJ and YSU simulation scheme can well reproduce the wind speed characteristic. And MYJ scheme is better than YSU scheme, especially in the simulatio of wind shear. With YSU and MYJ schemes, the comparison of the simulation results under different meteorological conditions in August2010show:1) The simulation results of YSU scheme are better on clear day, gale and rainfall occasion, the simulation results of MYJ scheme are better on heavy cloud occasion, and the simulation results are likely on high temperature occasion;2) Even on different weather occasion, the simulation result of30m is better than70m;3) The performances of both scheme on clear day occasion and rainfall occasion are the best, on heavy cloud occasion takes the second place, and on gale and high temperature occasion are the worst. The errors are caused by two reasons:1) the worse simulation performance of the wind shear by WRF;2) the heating by underlaying surface.