[Using Hybrid Modeling to Examine the Input Flux of Phosphorus and Its Reduction in the Terrestrial Area of Dongting Lake Area].

The study of terrestrial phosphorus inflow （hereafter referred to as phosphorus inflow） fluxes is essential for controlling non-point source （NPS） pollution. The SWAT model was successfully used to simulate phosphorus inflow fluxes in the Dongting Lake area, while a hybrid model （LSTM and SWAT） was developed and validated for predicting the reduction in phosphorus inflow fluxes among rivers based on three typical reduction scenarios： agricultural control, livestock and poultry reduction, and soil and water conservation measures. The results showed that the inflow flux of TP was 3.

Water level-driven agricultural nonpoint source pollution dominated the ammonia variation in China's second largest reservoir.

Rainfall-runoff and water flooding are the driving mechanisms of agricultural nonpoint source pollution (ANPSP), but existing research has hardly focused on water level-driven ANPSP. Danjiangkou Reservoir was the second largest reservoir in China, and its water quality was dominated by ANPSP. This study explored the effect of water level on water quality of Danjiangkou Reservoir and aimed to provide basis for water quality management of large reservoirs.

Evidence on the causes of the rising levels of COD along the middle route of the South-to-North Diversion Project in China: The role of algal dissolved organic matter.

As the biggest inter-basin water transfer scheme in the world, the South-to-North Water Diversion Project (SNWD) was designed to alleviate the water crisis in North China. The main channel of the middle route of the SNWD is of great concern in terms of the drinking water quality. In this study, we tested the hypothesis that the dissolved organic matter (DOM) derived from the planktonic algae causes the rising levels of COD along the middle route by monitoring data on water quality (2015-2019, monthly resolution).

Algal blooms in the middle and lower Han River: Characteristics, early warning and prevention.

Eutrophication with the sustained occurrence of harmful algal blooms (HABs) has been widely recognized since the 1990s as one of the largest drinking water quality issues in the middle and lower reaches of the Han River (MLHR, the largest tributary of Yangtze). Due to impoundment of the middle route of the South to North Water Diversion Project (SNWDP), the height of the Danjiangkou Reservoir Dam was raised in 2014, resulting in lower discharge (or flow rate) for the MLHR, and subsequently enhancing the potential occurrence probabilities of HABs. Here, the characteristics of HABs that took place during the 1992 to 2018 period were summarized based on the historical water quality and meteorological data.