INVESTIGATION OF EFFECTS OF WIND-DRIVEN CURRENTS ON THE ESTIMATION OF RIVER DISCHARGE

Abstract

 In order to improve the accuracy of river discharge estimation, an anemometer, a radio anemometer and ADCP were used to obtain the data of wind speed, surface velocity and vertical velocity profile of the river. Field observations were conducted soon afeter the arrival of typhoon at the Goryo Bridge of Tone River. From another data set at the Heisei Bridge of Tone River, the roughness parameter z0 was evaluated by using the U2.25 which was the wind speed on the bridge. The deviation between surface velocity by using the radio anemometer and horizontal velocity at the highest layer of vertical velocity profile by using ADCP was defined the wind-driven current component. In conclusion, the linear relationship of ⊿u = 0.114*U10 was obtained.