Abstract
Structures of wind-driven currents and water temperatures were measured to clarify the mixingprocess in a brackish lake with salinity interface at about 20m depth. Time series data were collected atevery 1m depth by using an ADCP and a thermistor chain.Current of about 20cm/s was generated by the wind speed of about 10m/s, and continued for longtime after the wind stopped due to generation of internal waves. Vertical profiles of velocity gradientindicated high values not only in thermocline region but also in the vicinity of the salinity interface.Profiles of gradient Richardson number had small values less than 1.0 in these layers and surface layer.This means that there are possibilities of mixing in some layers, and in fact an increase in the potentialenergy was detected after wind blew.
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