Abstract: The flow of tidal reach is affected by many factors,with complex periodicity and unsteady reciprocating movement.The topographical data of tidal reach is not available easily.In order to make full use of water level data,a stage routing model for tidal reach is established based on the bidirectional wave method.The basic principles and the improved method of the model are presented,including the way how tributary and local inflows are treated.Based on the specific characteristics of the Feiyunjiang tidal re...