THE EFFECTS OF NAGARA ESTUARY BARRAGE ON THE SALINITY INTRUSION

Abstract

This paper was carried out to make clear the characteristics of salinity intrusion in the absence of the barrage in Nagara estuary and to discuss the change of the mixing type due to the barrage using the parameter of tidal prism Pt. As a result, the following findings were obtained;
1) The mixing type changed by the seasonal variation of the river discharge.
2) Before construction of the estuary barrage, the mixing type varied from the partially mixed type to the well mixed type in summer and from the stratified type to the partially mixed type in winter.
3) The mixing type changed to the stratified type after construction of the estuary barrage.