The measurement of low-frequency sound is considerably affected by wind. We previously conducted wind tunnel experiments and field experiments, and confirmed that characteristic values of wind play a major role in evaluation of wind noizes. Here, we derive a wind noise estimation equation as a function of frequency, the mean wind velocity and the turbulence intensity of wind. A method is proposed for finding the necessary coefficients of the estimation equation through field measurements. Furthermore, field measurements of low-frequency sound a road bridge are conducted and the wind noise computed using the proposed estimation method and measured values are compared. As the consequence, we have verified that the proposed method is valid to esitimate wind noise in low-frequency sound measurement.
