Three-dimensional numerical modelling of water quality in Dahuofang Reservoir in China

• Published in: Science China. Physics, mechanics & astronomy mechanics & astronomy, 2011-07, Vol.54 (7), p.1328-1341
• Main Authors: Wang, JinHua, Shen, YongMing, Zhen, Hong, Feng, Yu, Wang, ZaiXing, Yang, Xu
• Format: Article
• Language: English
• Subjects: Ammonium; Annual variations; Astronomy; Biochemical oxygen demand; Bioengineering; China; Classical and Continuum Physics; Computer simulation; Design engineering; Dissolved oxygen; Eutrophication; Hydrodynamics; Mathematical analysis; Mathematical models; Nitrogen; Numerical models; Observations and Techniques; Organic nitrogen; Organic phosphorus; Parameter sensitivity; Phosphorus; Physics; Physics and Astronomy; Phytoplankton; Research Paper; Reservoirs; Simulation; Spatial distribution; Three dimensional models; Transport processes; Water conveyance; Water quality; 三维数值模拟; 中国; 亚硝酸盐氮; 大伙房水库; 富营养化模型; 水动力学模型; 水质量; 组件模型
• ISSN: 1674-7348; 1869-1927
• DOI: 10.1007/s11433-011-4365-2

A three-dimensional eutrophication model was applied to assist the management of Dahuofang Reservoir in China. Transport processes were obtained from the three-dimensional, finite volume hydrodynamic model. The hydrodynamic model was veri- fied for a one-year time period in 2006. Our simulation reproduced intra-annual variation of stratification. The simulated varia- tion of vertical thermal structures also matched observations. The water quality model included 8 state variables, including dissolved oxygen, phytoplankton as carbon, carbonaceous biochemical oxygen demand, ammonium nitrogen, nitrate and nitrite nitrogen, ortho-phosphorus, organic nitrogen, and organic phosphorus. Sensitivity of the parameters has been analyzed to de- cide which process would affect the water quality in the simulation. The water quality verification suggested the model suc- cessfully computed the temporal cycles and spatial distributions of key water quality components. The comparison between water quality components before and after the first phase of the water conveyance project suggests that the project has a slight effect on the reservoir ecosystem. The model could be used as a tool to guide physico-biological engineering design or man- agement strategies for Dahuofang Reservoir.