IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 3: Water and Carbon: Climate Change Impact : Fine sediment release from a reservoir by controlled hydrodynamic mixing
Fine sediment release from a reservoir by controlled hydrodynamic mixing
Author : J.M.I. Jenzer Althaus, G. De Cesare and A.J. Schleiss
Reservoir sedimentation is worldwide a problem and requires a sustainable solution. The idea of maintaining sediment in suspension by a jet induced artificial turbulence and releasing it through the water intake was tested in laboratory experiments. Therefore, two jet configurations and the influence of their geometrical parameters and the jet discharge on the sediment release were investigated: (i) a circular jet configuration with four jets arranged in a circle on a horizontal plane and (ii) a linear jet configuration with four jets arranged on a line parallel to the front wall. Turbidity measurements accompanied by flow velocity measurements give information about the efficiency and its reasons. The circular jet arrangement was more efficient than the linear arrangement and reached with the highest tested discharge (ΣQj = 4050 l/h) an evacuated sediment ratio of 0.73. An optimal parameter set was identified having a release efficiency of between 1.5 and 2 compared to no jets, depending on time and discharge. The optimal jet configuration indicates best installation and discharge practice of the jets when fighting against reservoir sedimentation. A pilot prototype set-up underlines the experimentally found promising results.
File Size : 4,075,611 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 3: Water and Carbon: Climate Change Impact
Date Published : 01/07/2011
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