ABSTRACT
Eutrophication is a common water environmental problem in receiving water bodies. In the case of changing hydrodynamic conditions, excessive input of nutrients may lead to serious eutrophication of water bodies. To solve the problem of eutrophication, a lot of relevant water environment models were generally adopted to simulate the situation in the study area. Based on the EFDC model, this paper takes Hongze Lake as the typical research area. Under the hydrological conditions of a typical hydrological year, the temporal and spatial variation of nitrogen and phosphorus in Hongze Lake under the dual influence of natural inflow and the South-to-North Water Diversion Project was studied to provide a reference for the scientific management and water quality restoration and improvement. Results show that under the influence of natural inflow and water transfer in the Hongze Lake section of the eastern route of the South-to-North Water Diversion in the study area of Hongze Lake, nitrogen and phosphorus have become the main pollutants in Hongze Lake. The seasonal variation of TN concentration was obvious, the highest in spring, followed by summer, and decreased once in autumn and winter. The spatial and temporal distribution characteristics of TP concentration are obvious, and the lake area is generally higher in summer, followed by spring and autumn, and slightly lower in winter.
