부산대학교 도서관

This paper deals with the characteristics of the salinity intiusion in Abashiri River, which located in thenortheast of Hokkaido Island we found that the chief factors influencing mechanical properties of salinity irittusion istidal current and the river profile in Abashiri River.The present authors had alirady proposed the changing condition of mixing pattern of salt wedge under the influence of tidal cunrnt. By using these concept, it is possible to evaluate the change of the mixing pattern with salinity inbusion under the influences of the disturbance due to wind on the surface of the water and the river profile couldbe negligible in Abashiri River. However, we found that the salt wedge was completely broken down without the influence of tidal current at the 4km poirit (Kagamibasi-bridge) away from mouth of river, where a large projection exists on the bed. Hence it is necessary to apply the modified changing condition