| The study about the sediment motion on the muddy coast is an important part of the research about the harbour and coastal engineering. In order to accommodate the enlargement of ship, the maintenance depth of the harbour basin and navigation channel were increased gradually. As a result, the compensation for preventing or reducing deposition are usually very high. Therefore, there is very practical significance in the study on the mud motion and the prediction of the deposition rate. This study not only help to the channel regulation of the built harbours, but also have good to the planning of new harbours.The geomorphic feature, scour process of muddy coast are analysed in the paper. The water-sediment numerical simulation model under the action of wave and tidal current is built and validated. Adopted the model, the mean annual sediment distribution of Lianyungang Sea was obtained. Moreover, the general trend of sediment motion in Lianyungang Sea was analyed.By the field data and numerical simulation model, the deposition distribution was studied. Moreover, the effect of the dumpling material to the channel is simulated. In order to offer a scientific reference for Lianyungang Harbor's approaching channel extension project, the paper not only discuss the effect of the extension project to the flow pattern and sediment motion, but also forecast the deposition rate of the channel after the extension project. The study shows that the total deposition of the approaching channel is not serious, and the normal navigation can ensured by the dredging.Finally, the effect of the channel depth and the channel width to the channel deposition were discussed preliminarily. The study shows that, in an ascertain channel, on one hand, the deposition increases as channel depth increasing, and the increasing extent goes down; on the other hand, the channel deposition rate and amount reduce as the channel width increasing, and the decreasing extent goes down.
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