Abstract: The displacement height (d), which appears in the logarithmic velocity profile, is one of parameters that have been developed to express the response of ground surface and obstacles to airflow. This paper describes the application of the method for estimating zero-plane displacement based on experimental data from the gravel beds in wind tunnel. The results show that good correlation exits not only between the ratio of d to gravel height h and relief factor (Dv), but also between d and free-stream wind velocity. So, it is reliable to use this method to estimate the non-linear parameter d in the wind profile.

Key words: wind velocity profile, Marquardt method, displacement height