"Wando" is a small embayment adjacent to river, and it is known to provide an important habitat for aquatic organisms in rivers. Along the downstream part of the Kiso river, many tidal embayment are formed between groins, and these embayment might influence the water quality and the material cycling thorough the water exchange between the river and the sedimentary area during tide. In the present study, we performed the field observation focusing on the material transport at the embayment in 18.8km point. The time dependent change of the distribution of the Chloride ion was observed. This clarified that horizontal flow of the surface water in the embayment has periodical change regulated mainly by the tide. We carried out the horizontal two-dimensional flow and material transport analysis. As a result, it was clarified a part of complicated flow characteristics in the tidal embayment.
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