Primary research about wind characteristics of Tangshan Caofeidian waters

The preliminary research of the wind speed variation has been done using the data obtained from the Caofeidian coastal area station and buoy observation station from the year 2011 to 2012. The results are as follow:(1)there are large differences in diurnal variation of wind speed in different seasons and regions. The monthly averaged wind speed detected at the coast and the sea surface is significantly larger in winters; and it is smaller in flood seasons with a large maximum wind speed;(2)The wind direction with the maximum frequency of the year at the coast and the sea surface is S; and the frequency of occurrence is 9.5% and 9.7%, respectively. The WNW and NNW wind directions cover the smallest proportions. The transition property of wind direction is not obvious in spring of Caofeidian waters, the wind direction is mostly SSW.(3) There is a good correspondence between the two-minute average wind speed and maximum wind speed; the latter is roughly 1.5 times that of the former. The situation of sea surface wind speed is much better, where the ratio is constant at 1.2. The conclusion provides some references for the numerical estimation of the coastal and sea surface wind speed and the verification of the accuracy of the records.