Lateral sediment transport and morphodynamics in an meandering estuarine channel

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The influence of a meander on a cross-sectional distribution of turbidity maximum was investigated in the estuarine channel of the Chikugo river. The cross-channel currents near the bottom flowed from the outside to the inside of the curve, and the suspended sediment concentration was high at the inside of the curve. These facts suggest that the secondary current occur in the meander of tidal channel and the suspended sediment transported by the turbidity maximum is moved into the inside of the bend. Over a period of several months, fine sediment was deposited near the river bank inside the bend. The muddy bar was formed in the center of the bend in the early stage of sedimentation, and it spread upstream of the curve gradually. It was found that the transport of fine sediment by a tidal current has played an important role in the morphodynamics of a river estuary.