علیرضا فیوض

Nowadays river management plays an important role in supplying human needs. Choosing the best method of organizing not only economically but also in terms of ease and time is very important. A spur dike may be defined as a structure extending outward from the bank of a stream to protect outer wall in straight and curved shaped currents. With employing spur dikes, protection of the outer bank and deviation maximum velocities from the spur dike zone will be possible. Besides the spur dike geometric properties, the geometric properties of the training channel will influence flow pattern and bed scouring. That this factors the necessity to investigate of three-dimensional properties of flow pattern and bed topography changes in the arches associated with the hydraulic structures are reveals. in this research, into study of flow and scour pattern around the attractive, vertical and repelling T-shaped Spur dike located in the 90 degree bend using of ssiim three dimensional model has been studied. That this purpose initially to review of equilibrium bed topography in a 90 degree arc length and the formation of scour hole in the upper wing of vertical Spur dike in the upstream wing nose of breakwater and also identify the pattern of flow behavior by using profiles reviews of longitudinal velocity components u, and transverse component v and deep component w, process of secondary flow changes in the range of Spur dike and also flow lines in the different levels were investigated. Then, in order to better understand of flow pattern and scour in a 90-degree arc length channel and also around the T-shaped of Spur dike to simulate flow patterns and scour around a Spur dike located in a 90 ° channel under the effect of factors such as repelling and attractive phase, ratio of radius of curvature to the channel width and also submergence percent of the spurdike, were discussed and the impact of these factors on the bed topography and changes of transverse and longitudinal profiles