SPATIAL DISTRIBUTION OF WIND AND WATER CURRENT IN A LARGE MEANDERING RESERVOIR

The spatial distributions of wind, wind-driven current, water-column current, and surface temperature were observed in a large meandering reservoir. Overall, it was found that the wind blew along the valley, and it was relatively strong in the center of the wide area. On the other hand, the wind was weak near the shore, in an inlet, and in the meandering area. A high water temperature was observed in places where the wind was weak. The diurnal current direction of surface water in the central area varied hourly, although the wind direction remained constant. The measurement of the horizontal current distribution at 11 stations indicated that all the velocity vectors do not run along the valley, and a vortex and divergent flow were produced by an underwater ridge. It is important to consider the horizontal distribution of wind and water current in order to control the water quality of a meandering reservoir in a mountainous region.