Abstract
Modeling the effects of atmospheric deposition on the water quality of the middle route of the South-to-North Water Diversion Project (MR-SNWDP) can provide a basis for scientific protection and optimal allocation of water resources. Considering the total nitrogen (TN) as a representative water quality index, this study analyzed the water quality variations along the MR-SNWDP and in the Miyun Reservoir under atmospheric deposition, using the hydrodynamic and environmental numerical models. The results in 2016 revealed that the atmospheric deposition significantly affected the water quality of the MR-SNWDP, and the effects of atmospheric deposition on the water quality of the middle route and Miyun Reservoir showed different variation rules. However, the clearer water from the MR-SNWMP would significantly deteriorate after storage in the Miyun Reservoir as the TN concentration increased significantly. Based upon the scenario analysis, it was found that the constant water diversion scheme helped reduce the effects of atmospheric deposition. Further, it is recommended that the storage amounts in the Miyun Reservoir should be as low as possible.
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