동절기 낙동강 원수 유입에 따른 회야 댐의 식물플랑크톤 분포 특성 연구

Abstract

Generally, by the influx of Nackdong-River water, by the frequent winter drought even in the period when relatively water quality is stable in winter, the quality of Hoeya-Dam water is influenced by the state of water quality of Nackdong-river water receive. Therefore, during the time when Nackdong-River water flows in, it can be expected to be influenced by the phytoplankton reproduction of the dam. In the investigation, it was confirmed that the phytoplankton cells of Hoeya-Dam added as the Nackdong-River water inflowed, and the distribution of phytoplankton also occurred. Declining influx of Nackdong-River water shows that the dominant group of Hoeya-Dam transitions to brown flagellous algae with diatoms and the decrease in diatom share of the Hoeya-Dam reached a phase such as a decrease in the share of the Nakdong-River water diatoms showed. In the water of the Nackdong River which flowed into the dam during the investigation period of this study, Asterionella sp. , Cyclotella sp. , Stephanodiscus sp. Had sometimes exceeded the critical concentration that could cause a peculiar smell, and even at the same time period Hoeya-Dam showed concentrations approaching the critical concentration. Especially Asterionella sp. Was considered to be one of the most smell generators among diatoms, so it was necessary to pay attention to this. Stephanodiscus sp. Was more than 2,500 cells in all points by water depth in 2014 when the Nackdong-River water inflow was the most frequent in the Hoeya-Dam. Stephanodiscus sp. When the problem of filter paper blockage occurred, the range of cells was 1,450 ~ 45,000. Considering the book, the filter paper occlusion occurred in repeated water field Stephanodiscus sp. It seems that the influence to some extent is bad. According to these results, when using dam water of the time when Nackdong-River water is used, Hoeya-Dam which can select by water depth, the critical concentration of phytoplankton causing taste and smell and Considering phytoplankton cells that cause filter paper blockage, it is considered advantageous to choose 26 m water instead of 20 m water.