HR: 15:15h
AN: H23A-06    [Abstracts]
TI: A model study of the coupled water quality and hydrodynamics in YuQiao Reservoir of Haihe River Basin, People's Republic of China
AU: * Liu, X
EM: lxb78@126.com
AF: Beijing Normal University, Environmental School, Beijing Normal University, Beijing, 100875, China
AU: Liu, J
AF: Beijing Normal University, Environmental School, Beijing Normal University, Beijing, 100875, China
AU: Peng, W
AF: Department of Water Environment, China Institute of Water Resources and Hydropower Research, Department of Water Environment, China Institute of Water Resources and Hydropower, Beijing, 100038, China
AU: Wang, Y
AF: Department of Water Environment, China Institute of Water Resources and Hydropower Research, Department of Water Environment, China Institute of Water Resources and Hydropower, Beijing, 100038, China
AB: In recent years, eutrophication has become one of the most serious of global water pollution problems, especially in reservoirs, which is menacing the security of domestic water supplies. As the unique drinking water source of Tianjin within the Haihe River basin of Hebei Province, China, YuQiao Reservoir has been polluted and its eutrophic state is serious. To make clear the physical and chemical relationship between transport and transformation of the polluted water, a model package was developed to compute the hydrodynamic field and mass transport processes including total nitrogen (TN) and total phosphorus (TP) for YuQiao Reservoir. The hydrodynamic model was driven by observed winds and daily measured flow data to simulate the seasonal water cycle of the reservoir. The mass transport and transformation processes of TN and TP was based on the unsteady diffusion equations, driven by observed meteorological forcings and external loadings, with the fluxes through the bottom of the reservoir, plant (algal) photosynthesis, and respiration as internal sources and sinks. The solution of these equations uses the finite volume method and alternating direction implicit (ADI) scheme. The model was calibrated and verified by using the data observed from YuQiao Reservoir in two different years. The results showed that in YuQiao Reservoir, the wind-driven current is an important style of lake current, while the water quality is decreasing from east to west because of the external polluted loadings. There was good agreement between the simulated and measured values. Advection is the main process driving the water quality impacts from the inflow river, and diffusion and biochemical processes dominate in center of the reservoir. So it is necessary to build a pre-pond to reduce the external loadings into the reservoir.
DE: 0458 Limnology (1845, 4239, 4942)
DE: 0469 Nitrogen cycling
DE: 0470 Nutrients and nutrient cycling (4845, 4850)
DE: 0496 Water quality
DE: 1857 Reservoirs (surface)
SC: Hydrology [H]
MN: 2007 Joint Assembly