Author(s): H. Ikeda; T. Asaeda; G. Suga; T. Fujino

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Abstract: Among systems for pumping bottom water,the hydraulic gun,pumping system with airbullets through the vertical shroud,has several avdantages;the structure in the water is simplerthan the mechanical fan system,therefore less prone to trouble.Since more disturbance is pro-duced in the free surface with the hydraulic gun system than with other systems,more oxygencan be supplied to the water.Although this system has the less energy conversion efficieny forpumping ability compared with the bubble plume system(Asaeda and Imberger(1991)),thebottom water is more firmly pumped up to any level even in a strong stratification,which makescontrolling stratification patterns more easily.For these reasons,this system is still used in manyreservoirs for destratifying lakes or controlling their stratification patterns(Kawakita(1990)andAsaeda(1991)).No available model was developed to analyze this system,however,because ofdifficulties in modelling its highly unstable process.Therefore,the purpose of this paper is todevelop a simple model for practical use.

DOI:

Year: 1993