Abstract
Excessive phytoplankton growth as a result of eutrophication is considered problematic in closed waters including a reservoir. An introduction of a flow accelerating device may enhance self-purification potential of such the stagnant over-nutrified water, although the installation cases of the device have not so far been common. This study thus aimed to investigate flow dynamics caused by the device with ADCP, and changes of water quality parameters. The results were as follows: (1) The injected water reached at 50m far from the device during the non-stratification and stratification period. Marginal broadening at transverse direction was observed during the stratification period. (2) The stratified layer was completely destroyed at 10m close to the device, besides being mediated at30m far from it during the non-stratification period. A gradual breaking of stratification was also observed even during the stratification period. The overall efficiency of such a device thus depends on the strength of stratification.
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