Understanding reservoir backflow as a factor on the massive outbreak of harmful cyanobacteria |
---|
학술지명 Korean Society of Limnology
저자 신재기
발표일 2021-12-10
|
Worldwide outbreaks of bloom-forming harmful cyanobacteria have been reported as various results. The reservoir backflow (RBF) is one of the strong physical accumulation mechanisms in reservoirs where harmful cyanobacteria occur in large quantities, but studies on its effect are extremely rare. In order to understand the abnormal excess of harmful cyanobacteria, we monitored RBF for 3 years (2019-21) in the hypertrophic tributary located upstream of the drinking water reservoir (Daecheong). The spatiotemporal behavior (transportation and dispersion) of harmful cyanobacteria was analyzed using reservoir hydrological factors, chlorophyll-a concentration, turbidity, TSS, and AFDM. RBF was significant when the water level increased due to heavy rainfall and reservoir inflow. It was particularly pronounced in years without it compared to years with discharge through the spillway. When harmful cyanobacteria were accumulated by RBF, a hard scum like deep green-color paint was formed. In this case, the effort to deal with it is unimaginably very difficult. Therefore, the RBF case should be actively reflected as a way to effectively manage harmful cyanobacteria outbreak. |