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The seawater intrusion renders the quality of river water unsuitable for agricultural use.The phenomenon called "saltwater wedge",in which upper layer of freshwater and underlying layer of saltwater are highly stratified,is likely to occur near the estuaries of rivers draining into the Sea of Japan due to its small tidal range.Paddy fields irrigated using the water from Shinkawa River in Niigata city,Japan,have been suffering from the saltwater wedge presences with varying degree under different river discharge and tidal amplitude.The study integrates field observations and numerical simulation of the Shinkawa River estuary to ascertain the variation range of saltwater wedge during the irrigation period of paddy fields.