Ecology, Environment and Conservation Paper

Vol.17, Issue 1, 2011 ; Page No.(23-28)

ANALYSIS OF BENDS ( ) EFFECT ON THE HYDRAULIC OF MORNING GLORY SPILLWAYS

F. Yosefvand, H. Musavi Jahromi, M. Shafai Bajesta, A. Masjedi and H. Sedghi

Abstract

The morning glory spillway is one of the spillways used for carrying additional waters and flood flows from an upstream to downstream in dams. Besides providing sufficient capacity, spillway plan should be adequate hydraulically and structurally. The manner of discharge and common hydraulically circumstances and discharge characteristics in morning glory spillways changes according to various comparative component scales. The characteristics of spillway discharge depend on installation devised to control outflow circuit. In this research by making physically - hydraulically spillway model, the Effect (Bend center line radius to bend diameter) on the hydraulically discharge circumstances with 90 various tests and then in submerging circumstances have been studied and the conclusions are presented in diagrams. The results show that as the increases, discharge coefficient decreases. Also, with the increase of (R increase and d constant), the amount of bend loss decreases.

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