A2-D hydrodynamic model was developed to investigate the effect of spur dikes on the local scour where Naga Hammadi Barrage was selected as a case study. The model was verified against experimental results of a physical modeling in order to assure its validity. Confident with the verified model, simulations were executed the implementation process. It ws intended by these simulations to study the geometry of scour holes presented in terms of depth and length in addition to specific energy at the region of contraction. The study concluded that the summation of the scour depths is directly proportional to the number of groins which is a function of groin length, spacing, and the required protected length. The scour depth is directly proportional to groin length under constant orientation angle. However, for fixed groin lengths, both scour hole depth and length are directly proportional to the orientation angle. It was also concluded that the continuity of the scour hole length in front of spur dikes installed group is inversely proportional to the spacing between the groins. |
