| Continuous Current Measurements off the Mouth of the River Seri |
| Shuichi ENDOH, Iwao OKAMOTO, Yasuaki OKUMURA and Michio KUMAGAI |
| Res. Report from Lake Biwa Res. Inst., No.89-A05, 35-46, 1990 |
| Continuous current measurements have been carried out off the mouth of the River Seri of Lake Biwa since 1981. During 1987-1988, spatial distributions of current, water temperature, electric conductivity and turbidity have been measured in detail by using 14 sets of current meters. The current field in this area is strongly controlled by the wind. High correlations are found between the daily averaged current speed and wind speed. The north-west wind which is the most dominant wind, produces the current with the offshore direction in the bottom layer by the effects of surface elevation, wind stress and vertical viscosity. The continuous strong south-east wind causes the coastal upwelling of deep cold water in this region. The land and lake breeze causes a daily variation of the current with a direction perpendicular to the shore line. This periodic current variation controls the inflow of the river water. The continuous measurements of temperature, electric conductivity and water level of the river water have been carried out at Ikesu Bridge since May of 1988. The large amplitude of daily variations of water temperature and electric conductivity have been found out in the river water. |