藍藻類の増殖抑制効果に対する曝気循環対策の施設規模の影響

抄録

We investigated the relationship between the abundance of cyanobacteria and stratification intensity N² in three eutrophicated reservoirs in which an artificial circulation system had been installed and the effects of the facility scale on that relationship. Cyanobacteria markedly increased when N² was above 10^-4 [s^-2] in all three reservoirs whether the artificial circulation was installed or not. A certain facility scale wais needed for the decrease of N². Sufficient decrease in N² by the facility occurred in the reservoir in which cyanobacteria was prevented. The appropriate facility scale to decrease N² was considered to be related to the internal Froude number inherent in each reservoir.