Curved guide wall sediment excluder

Hussein, Ahmed Salih Ahmed (1984) Curved guide wall sediment excluder. University of Southampton, Doctoral Thesis.

Abstract

Curved guide wall sediment excluder is a device for minimizing sediment entry into irrigation canals at diversion works. It deals specifically with bed sediments. It relies on creating spiral motion by letting the diverted flow pass between its two curvilinear walls (usually concentric in plan) before entering the canal and the sluiceway. By so doing, the faster moving water near the free surface will be diverted towards the concave wall where the canal intake is positioned and by continuity considerations, the heavy sediment laden water near the bottom is deflected towards the convex wall away from the canal intake and towards the sluiceway. Model study of a typical prototype curved guide wall sediment excluder is made to study its behaviour under varying approach flow direction as well as variable sluice to canal discharge ratio which is the most important operational aspect. Experimental results indicated that for minimum sediment entry into the canal, the sluice to canal discharge ratio should not drop below one third, while the maximum mobility number, defined as the ratio of the maximum tractive force acting on a sediment grain at the bed to the submerged weight of the grain, should be about 0.10. A mathematical model was also developed to predict the radial velocity distribution as well as the bed deviation angle within the excluder. Recommendations and design procedure for such type of sediment excluders are also given.

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