عنوان مقاله [English]
In designing the stilling basin is trying to jump as close as possible to deal overflow, without affecting the flow of the weir is formed. In other words, to prevent the escape jump. For this purpose, the dissipation variety of water-Such as foam blocks and foam baths and foot spillway is used in sill. And thus reduced the length of the basin And is closer to the heel the spillway. In this study, to reduce the distance spillovers paws to start jumping from block foam blocks composed of 8 different forms were used. In these experiments, the spillway ogee with three heights (6, 5 and 4 cm) and for each spillway 4 slope (0/0 and 010/0 and 007/0 and 005/0) and for each slope 6 Dubai for Discharge 8 obstacles with different shapes were examined. The results showed that the total utilization of foam blocks in the stilling basin depth decreases, the distance between the top of spillway toe jump, the length jump and increase energy loss and improve the properties of hydraulic jump will be. In between shapes, the floor prevents the w90 is most effective. So that the spillway distance between the toe to jump start to a 65% reduction is unobstructed.