Considering the influents of both runoff and winds

Circulations in the Hedi reservoir from January 2013 to March 2014 were simulated using FVCOM. Simulated results agree well with the observations during March 2014. Comparisons among the circulations caused by runoff

different dominant winds and both runoff and winds during 2013 showed that: ① The structure of the circulations changed with the dominant winds. Under the NNE wind

several anticlockwise circulations were observed

and the west coast flow was stronger than the east coast

while under the S or SSE wind

clockwise and anticlockwise circulations were found at the same time

and the east coastal currents were stronger than the west. ② During the winter half year

when runoff was weak while winds were stronger

the winds controlled the horizontal and vertical circulations; During the summer half year

when runoff was stronger with reverse winds

the runoff controlled the circulations. ③ The main circulations were anticlockwise for the whole reservoir in the annually average level

and the coastal currents were strong

especially

the west coast currents.