EFFECT OF THE INFLOWING RIVER WATER THROUGH THE SOIL ON THE GROUND WATER IN TIDAL FLAT

Abstract

Salinity distribution was observed under the ground surface of the tidal flat formed at middle part of Ohta River Flood Control Channel, and the mechanism of salinity retention under the ground was considered. The measurement method of salinity under the ground was developed and the detail ground water quality profiles were measured. Furthermore, to clarify the supply mechanism of river water into the tideland ground, the characteristics of salinity variation and current field were discussed by using the continuous measurements of salinity and flow under the ground. It can be understood that intrusion into the ground of river water is limited under the condition that the ground water level has remained at the ground surface level, and the tideland environment depends on the ground water quality.