[Assessment of Potential Risk of Diffuse Pollution in Haihe River Basin Based Using DPeRS Model]

Area of Science:

• Environmental Science
• Remote Sensing
• Water Quality Management

Background:

• Diffuse pollution poses a significant threat to water resources.
• Understanding spatial distribution and sources is crucial for effective management.
• The Haihe River Basin faces challenges with water quality due to diffuse pollution.

Purpose of the Study:

• To analyze the spatial distribution and pollution sources of diffuse pollution in the Haihe River Basin using remote sensing.
• To develop a potential risk grading method for diffuse pollution.
• To assess the diffuse pollution risk across the Haihe River Basin.

Main Methods:

• Utilized the DPeRS model for pixel-scale analysis of diffuse pollution.
• Integrated surface water quality evaluation standards.
• Developed a potential risk grading method based on pollution loads and water quality standards.

Main Results:

• In 2016, diffuse discharge loads were high for total nitrogen (TN), total phosphorus (TP), ammonia nitrogen (NH4+-N), and chemical oxygen demand (COD).
• Farmland runoff was the primary source for TN, TP, and NH4+-N; urban life was the main source for COD.
• Diffuse pollution and high-risk areas were concentrated in the central and southern parts of the basin, with >36% of the area at risk for nitrogen-phosphorus pollution.

Conclusions:

• Farmland runoff and urban life are key diffuse pollution sources in the Haihe River Basin.
• A significant portion of the basin is at risk from nitrogen-phosphorus diffuse pollution.
• Targeted management strategies are needed for high-risk areas to mitigate diffuse pollution impacts.