Experimental Investigation of Scour Pattern around Submerged T-Shape Spur Dike in Straight Channel

Spur dikes are used for preventing river banks’ erosions. Spur dike causes variations in flow field, sediment transport and bed topography.In this paper the topography of bed and flow pattern around of submergesT shape spur dike in direct channel was assessed. Experiments were conducted in rectangular flume having 0.6 m width, 0.7 m height. The variations of parameters like the length of the spur dike and its wing, depth of submergeand Froude number on dimensions of scour around T shaped spur dike and the bed’s topography were studied. The results show that by increasing the Froude number and length of spur dike the amount of scour increases. Also with increasing the depth of submergence in a limited area, at first amount of scour and extension dune, increases and then decreases. Analysis of results relevant toscour pattern in cross and longitudinal sections, and different plans are among other points introduced in this paper.