Calculation of sea surface drag coefficient and wind stress in the Gorgan Bay

In this study, considering the closed basin Gorgan Bay which is marine ecologically important, and the information and data available in the region, the wind stress in the bay, is calculated taking into account the drag coefficient. Wind stress is one of the important factors in water circulation and the exchange of energy between air and sea. By studying different parameters affecting wind stress such as wind speed and local drag coefficient, the wind stress and drag coefficient were calculated based on the data of Meteorological Organization. Also, the stress due to rainfall in the bay was calculated and investigated. The results show that the average drag coefficient and wind stress in the Gorgan Bay in 2008 were 1.66×10-3 and 0.37 N/m2, respectively, which should be considered in the pattern of water circulation and more precise calculations of sea level for designing of marine structures.