Water Quality Impacts in Drawdown Areas Based on the MIKE11 Model
YAN Chendan
WANG Zhe
ZUO Huanrui
Abstract：In order to analyze the impact of return flows generated after the operation of the Pagu Reservoir Project on the surrounding water environment,a one-dimensional hydrodynamic and water quality coupled model of the reservoir drawdown area is established based on the hydrodynamic and water quality modules of MIKE11,and the variation of river water quality in the drawdown area is predicted and analyzed.Based on the MIKE11 water quality model,this paper predicts and analyzes the longitudinal variation of water quality along the Nimumaqu River downstream of the dam site under a P=95%hydrological year,as well as the intra-annual variation of water quality at key water source sections downstream of the dam site.According to the prediction results,in a P=95%hydrological year,with the inflow of downstream point sources and agricultural non-point sources,the concentration of pollutants in the river increases.The pollutant concentrations along the Nimumaqu River and at key water source sections are slightly higher than the current levels,but still meet the Class Ⅲ standard,indicating that the impact on the water quality of the Nimumaqu River and key water sources is relatively small.
Keywords：MIKE11 modelhydrodynamic and water quality coupled modelwater quality in drawdown areawater environmental impact
Publication Date：2026-04-20
Online Publishing Date：2026-09-16(First online date of this platform, not the publication date of the document)
Pages：6( 40-45 )