河口締切にともなう塩分分布変化について(I)

Abstract

Experiments on the motion of salt water in the upstream side of river mouth damwere carried out in order to investigate the salinity distribution and prevent salt in-trusion.It was shown that a hollow in the river bed stores the intruding salt water and cansuppress the rise of salt into the upstream water. Increase of flow velocity of the freshwater over the hollow, stimulation of interfacial oscillation by periodical discharge ofwater and utilization of suction pipe were tested in order to drain the salt water fromthe hollow.Experiments on the prevention of salt intrusion by a vertical water jet from bottomshowed the validity of fluid barrier against salt water inflow with low velocity.