In this report the behaviour of Salt Wedge which have been experimentally are presented.
　The Salt Wedge in an estuary non tidal motion is determined by the Fresh Water velocity and the channel topography, Hence, the length of salt wedge variasion will be considerable for irregulor of width and depth. Experiments have been conducted for the fast case of a channel with an abrupt change in depth of local. Measurement include the wedge shape and size, the surface slope, the inter face slope, the velocity and density distribution. Profiles of stress and interfacial stress coefficient are developed from the observation and the equaion of motion.
　In was found that the Salt Wedge length is change by the channel with an abrupt change in depth of local. Comparison of the theory with experimental results obtained from the measurements of wedge length show a fairly good agreement.
　The interfacial stress coefficient is depends on the Reynolds number & Froud number of fresh water and Salt Wedge slope.