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Impact of South-side Drainage of Qingcaosha Reservoir on Water Quality of Changxing Island
GAO Li-sha
Journal of Changjiang River Scientific Research Institute ›› 2025, Vol. 42 ›› Issue (12) : 51-56.
PDF(1175 KB)
PDF(1175 KB)
Impact of South-side Drainage of Qingcaosha Reservoir on Water Quality of Changxing Island
[Objective] To investigate the impact of the completion and operation of the south-side drainage project of the Qingcaosha Reservoir on the water quality of the Changxing Island river network, this study quantitatively assesses the improvement effects of the project’s drainage on the river network’s water quality under different operating conditions. [Methods] Based on detailed fundamental data, a one-dimensional hydrodynamic and water quality model for Changxing Island was constructed, calibrated and validated using measured data. The improvement effects of the south-side drainage project on the river network water quality were quantified under different operating conditions; furthermore, a water resource scheduling approach for the Changxing Island river network was proposed and optimized under the planned scale conditions through multi-scheme comparison. [Results] The model simulation analysis showed that when the Changxing Island pump-gate system operated under routine scheduling, the project operation could increase the proportion of river length with a permanganate index of Class Ⅲ and above from 25% to 35%-40%, and increase the proportion of river length with total phosphorus of Class Ⅱ and above from 72% to 77%-82%. The west-to-east drainage scheme demonstrated a significantly better improvement effect on total phosphorus in the Changxing Island river network than the routine scheduling scheme. Under the maximum flow condition of the project, this scheme could increase the proportion of river length with total phosphorus of Class Ⅱ and above to 95%. [Conclusion] The completion and operation of the south-side drainage project of the Qingcaosha Reservoir can effectively improve the water environment quality of Changxing Island river network. To make full use of the high-quality water resources, the west-to-east drainage scheme demonstrates a significantly better improvement effect on total phosphorus in the Changxing Island river network than the routine scheduling scheme, delivering greater environmental benefits. The research findings can provide technical support for promoting water circulation and water resource scheduling in Changxing Island.
Qingcaosha Reservoir / drainage project / water quality of Changxing Island / hydrodynamic and water quality model / water resources scheduling
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The influence of water level change rate on riverbank collapse was examined via generalized model test and numerical simulation. Results demonstrated that water level fluctuation had significant impact on bank collapse. Particularly, in the stage of water level drawdown, the larger the dropping rate, the more evident the bank collapse. Stability calculation of bank slope revealed that the factor of stability augmented in the stage of water level rising, but once the water level reached a high value, the factor of stability declined at first and then maintained stable; in the stage of water level drawdown, the factor of stability reduced and was closely related to the dropping rate. The research finding offers theoretical basis for analyzing the evolution of bank slope stability under varying water level fluctuation rate and also for taking corresponding treatment measures.
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