Study of Aeration Efficiency at Weirs

Authors : Ahmet BAYLAR

Pages : 255-264

View : 21 | Download : 17

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The amount of dissolved oxygen insert ignore into journalissuearticles values(DO); in the waters of rivers and streams is very important to the quality and existence of aquatic life. Hydraulic structures have an impact on the amount of dissolved oxygen in a river system, even though the water is in contact with the structure for only a short time. The same quantity of oxygen transfer that normally would occur over several kilometers in a river can occur at a single hydraulic structure. The primary reason for this accelerated oxygen transfer is that air is entrained into the flow, which produces a large number of bubbles. These air bubbles greatly increase the surface area available for mass transfer. Plunging overfall jets from weirs are a particular instance of this, and the aeration properties of such structures have been studied widely in the laboratory and field over a number of years. This study investigates weirs having different cross-sectional geometry and how they affect the aeration performance. It is demonstrated that the aeration efficiency of the triangular notch weir is generally better than the other weirs.
Keywords : Oxygen transfer, Dissolved oxygen, Aeration, Aeration efficiency, Weirs