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Langhe River is a first-class tributary of Hanjiang River and an important water source for Danjiangkou reservoir. The river's water quality thus has a direct influence on the water quality of the reservoir and the stable operation of the South-to-North Water Diversion Project. Cyanobacterial blooms have occurred frequently in the lower Langhe River in recent years, seriously threatening water resource security. In this study, we analyzed the spatiotemporal patterns of nutrients, mechanisms driving eutrophication, and factors associated with algal blooms(causal analysis) in Langhe River bay of Danjiangkou reservoir. Our objective was to support ongoing efforts to control algal blooms in the reservoir. The study section of lower Langhe River stretched 16.8 km from Langhe bridge to the reservoir. During the high-incidence period of algal blooms in 2021(August-September), water quality and algal monitoring were carried out at 6 sites(X1-X6) in the study section on 14 occasions(7 times each during August and September). The data was then analyzed using a suite of methods including the single-factor pollution index, trophic state index and redundancy analysis. The primary formation mechanism of cyanobacterial blooms was elucidated and, finally, prevention and control measures were proposed. Overall water quality in the Langhe River study section was classified as mildly polluted. The single-factor pollution index showed significant spatial differences in pollution degree among sampling sites, with severe pollution observed at Langhe Middle School(X1) and Bowan bridge(X2), where total nitrogen, total phosphorus, and the permanganate index were the primary pollutants. The X2 site was characterized by “high temperature, high pH, high DO, high nutrients, and low transparency”, with a peak cyanobacterial density of 1.2×108 cells/L and the comprehensive trophic state index indicating mild eutrophication. Redundancy analysis revealed that pH had the highest independent explanatory power for cyanobacteria distribution(69.6%), followed by CODMnand total nitrogen. Cyanobacterial blooms resulted from the synergistic effects of exogenous nutrient input and low flow conditions in the Langhe River backwaters [flow velocity of 0.05 m/s and HRT(hydraulic residence time) of approximately 18 hours]. The persistent “high pH-high DO” conditions during the day indicate high algal productivity because photosynthesis produces oxygen and consumes carbon dioxide(CO2, a weak acid in water). Based on our causative analysis, an integrated “sourcetransport-converge” management strategy was proposed, including upgrading wastewater treatment plants, constructing a low weir system to enhance water flow, releasing filter-feeding fish, and establishing an online monitoring and early warning system. The findings of this study provide references to prevent eutrophication by better managing inflow rivers in the water source area of the Middle Route of the South-to-North Water Diversion Project.
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Basic Information:
DOI：10.15928/j.1674-3075.202511200003
China Classification Code:X524
Citation Information:
[1]YE Xinggang,LI Xiaobo,WU Mengxia ,et al.Causal Analysis,and Prevention and control Measures of Cyanobacterial Blooms in Langhe River Bay of Danjiangkou Reservoir[J].Journal of Hydroecology,2026,47(05):49-61.DOI:10.15928/j.1674-3075.202511200003.
Fund Information:
2021年十堰市科技局科研课题（2021K61）; 2024年湖北工业职业技术学院科研课题（2024KY02）
2026-03-27
2026-03-27
2026-03-27