Study the factors affecting the proposed model to calculate the rate lateral migration of the Tigris river in the Kut city

الملخص EN

The proposed model depends on bank shear stress for the external riverbank, lateral bed slope, volumetric longitudinal bed load discharge per unit channel width, and lateral to longitudinal bed load discharge ratio, bend scour factor, and stream power.

In this research, were discussed factors affecting the proposed model used to calculate the rate lateral migration happening in the bank of the River Tigris in the city? Several variables have been used to compute the factors mentioned them, among these variables, radius of curvature, top water width, depths of water, angle of bend, and velocities of water, longitudinal water surface slope, and mean diameter of sediment particles.

The proposed model shows that the migration rate decreases as the radius of curvature, top water width, angle of bend, flow velocity at bend entrance (unless it exceeds the flow velocity at bend exit), flow velocity at bend exit (unless it exceeds the flow velocity at bend entrance), and depth of water near the outer bank are increased.

On the other hand, the proposed model shows that the annual migration rate increases as the flow velocity at channel centerline, flow depth at channel centerline, longitudinal water surface slope, mean particle diameter at channel centerline and near the outer bank, bank shear stress for the external river bank, volumetric longitudinal bed load discharge per unit channel width, lateral to longitudinal bed load discharge ratio, and bend scour factor are increased.