Abstract
Wind-driven currents are very important on the material transport and the gas or thermal exchange through the water surface of lakes and oceans. Secondary circulations in wind-driven currents, which are called ’Langmuir circulations’, may play an important role on such processes. However, they have not been well confirmed yet. In this study, field observations by using the horizontal and the vertical ADCP and the thermistor chain were conducted. Horizontally-periodic profiles of horizontal velocity and vertical velocity were obtained under the strong wind condition. Spacings from the results of velocity observations were well agreed with the empirical curve proposed by Faller and Caponi6). Vertical profiles of water temperature were varied from the stratified condition to the vertically-uniform condition. Under no wind condition, such variation may be caused by the thermal advection. On the other hand, under the strong wind condition, such variation may be caused by the water mixing due to Langmuir circulations from the results of velocity observations.
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