Abstract：Mean wind speeds at different 5 heights during the landfall process of three strong
typhoons, i.e. Typhoon Haitang0505, Typhoon Matsa0509 and Typhoon Khanun0515, are recoded at the
anemometer tower with a height of 120m located in Donghaitang, Zhejiang Province. It is found that
the power exponents of wind profile vary violently before the landfall of the typhoon and become
stable after that. The power exponents for tropical cyclone conditions in terrain category A are
mostly larger than the value given in the code, which is 0.12, and are smaller than 0.12 only when
the center of the typhoon passes through the anemometer tower. At the periphery of the typhoon,
mean wind profile decreases slowly with the increase of the distance between the typhoon center
and the anemometer tower. When the typhoon center passes through the anemometer tower, the mean
wind profile increases with the distance mentioned above. And after the landfall of the typhoon,
the mean wind speeds decrease while the mean wind profiles increase.
