Effect of spur dike as a protective structure on riverbend Using a mathematical model CCHE2D (Case Study: Hormozgan Minab River)

Instability of river bank leads to lots of problems in short and long terms. Gradual destruction of river bank makes consequently risk for structures and lands along the river coast. It can cause the field of sedimentation, reducing local angle of meanders and finally, making a new path for river. Numerical modeling of the effect of successive spur dike on flow and sediment patterns and providing protection for the bank of Minab River with using two-dimensional model CCHE2D, are conducted in this study. The parameters that were used for calibration, Including water depth and flow rate, which is measured in three river bend, At this stage, as well as to provide optimal networking of different models were used And Network 50*500 because it was closer to the results of field measurements was chosen. The results of this study show, Geometry of river flow and sediment regulated and guided the breakwater in the Thalweg river velocity and shear stress influences, So that a spur dike can lower velocity to 66 percent and deviation of maximum velocity lines from the banks and river bank zone, obviating 20 cm erosion and substituting 5 cm sediment on bank zone and finally it will establish and protect river banks.