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<br />29 <br /> <br />velocities except in the vertical direction, in which the particles are <br />allowed to settle due to the gravity effect. This assumption becomes invalid <br />when the sediment is transported primarily in the bed-load mode, in which <br />velocities of sediment particles and flow are significantly different. The <br />two-dimensional version of the model is applicable to highly unsteady flow <br />over a river bed co""osed of fine sediment in which the transverse velocity <br />and concentration profiles vary significantly. <br />