深層水揚水施設の効率的運用方法

抄録

Numerical analysis is performed on the mixing process of two-layerd stratification by a hydraulic gun system with air bullets or propellers. The hollow system is analyzed by dividing into two parts; lifting of the hypolimnitic water and destratification by the flow from the gun-outlet. Lifting discharge of the hypolimnitic water is formulated only with the air volume rate andthe volume ratio of a bullet, which leads to practicable estimation of lifting efficiency and good agreement with the results of a field experiment. On the destratification by the negatively buoyant jet from the gun-outlet, it is shown that the destratification efficiency is dominated by two parameters; non-dimensional air volume rate and stratification intensity with using the equivalent density gradient. These two kinds of efficiency leads to the total hydraulic efficiency of the hollow system. Typical four cases of lifting system are examined to seek effective air volume rate for arbitrary startification.