Investigation of return period annual fastest wind speed in Bushehr stations

In this paper, data of the annual fastest wind speed in Bushehr station in south of Iran were used and graphical and numerical methods were applied to compute scale and local parameters of the Gumbel Distribution Function (GDF). Then, different return periods for the annual fastest wind speed were estimated. In the estimation process of local and scale parameters, Standard analytical procedures such as Method of Moments (MOM), Method of Order Statistics Approach (OSA), Least Squares Method (LSM) and Maximum Likelihood Method (MLM), were used.  
Numerical computations show that the Method of Moments (MOM) provides better results compared to other methods and computed values for the scale and local parameters in estimation of annual fastest wind speed in Bushehr station are the best estimation.
Computations of the annual fastest wind speed for return periods of 25, 50,100 and 1000 years, estimated to 29.7 m/s, 32.8 m/s, 35.8 m/s and 45.9 m/s, respectively. Moreover, we can say that, in the confidence level of 95%, every 207.2 and 82.9 years, annual fastest wind speed of 39 m/s and 35 m/s can happen, respectively.