The 24th IAHR-APD Congress (24th IAHR-APD Congress)

215 / 2024-02-28 09:47:38

The Impact of Shuangjiang navigation hydropower junction project on phytoplankton in Fujiang river

navigation hydropower junction project；,phytoplankton,Fujiang river

To assess the impact of hydraulic engineering construction on the aquatic ecological environment of rivers, the cascade channelization of Shuangjiang navigation hydropower junction project in Fujiang was selected as the research subject. An investigation on the community structure of phytoplankton was carried out in Fujiang mainstream and tributary in April and October, 2023. The results revealed significant seasonal variations, with both average density and biomass of phytoplankton being higher in autumn than that in spring. Specifically, at the dam upstream section, the average densities in spring and autumn were 87.79×10⁴ cells/L and 246.68×10⁴ cells/L, respectively; at the dam downstream section, the corresponding values were 85.55×10⁴ cells/L and 214.31×10⁴ cells/L. In the tributary system, the average densities in spring and autumn were 84.44×10⁴ cells/L and 269.99×10⁴ cells/L, respectively. Overall, the construction of Shuangjiang navigation hydropower junction project had a greater impact on phytoplankton in spring, although the effect was relatively small. The research findings will provide important references for the analysis of the impact of hydraulic engineering construction on the aquatic ecological environment of rivers.