Multi-pollutant source-to-river modelling in the Three Gorges Reservoir Area, China: antibiotics, pesticides, and nutrients

Water quality in the Three Gorges Reservoir Area is affected by pollutants from farming, livestock production and wastewater. This thesis examines antibiotics, pesticides, and nutrients such as nitrogen and phosphorus. It combines data from rivers, farms and wastewater treatment plants with modelling to identify sources, transport routes and high-risk locations. The findings show strong seasonal and sub-basin differences: wastewater and livestock can drive antibiotic pollution, crop-specific pesticide use can cause peaks, and nutrient loads differ between tributaries and the main river. The work supports targeted monitoring and coordinated measures to protect ecosystems, food production and public health.