Scenario analysis on the management practices and optimization of rural non-point source pollution with the coupling of source-process-end: A case study of the Guishui river basin

作者：Chen Xie, Leyao Zhang, Meilin Wang, Qunou Jiang · 发表于：Ecological Indicators · 年份：2024 · DOI：10.1016/j.ecolind.2024.111677 · 被引用次数：23 · 研究领域：Hydrology and Watershed Management Studies、Soil and Water Nutrient Dynamics、Water resources management and optimization

Currently, non-point source (NPS) pollution is the primary contributor to water pollution in river basins. Therefore, assessing the benefits of rural non-point source pollution management measures and optimizing their allocation are of great significance for improving water quality. In this study, a SWAT model was firstly constructed for the NPS pollution simulation and optimization based on the four-period land use data, which was more suitable for the Guishui River Basin. And then it was calibrated and verified by using the monitoring data. On the basis of spatiotemporal evolution of total nitrogen (TN) and total phosphorus (TP) in the Guishui River Basin from 2007 to 2019, and the priority control areas for TP and TN were identified based on the RUSLE and additive models. Next, seven management measures scenarios were designed in the priority control areas from the perspectives of hydrological response units (HRUs), sub-basins, and basin scales. Finally, the cost-effectiveness of each scenario was quantitatively evaluated, and the optimal allocation scheme of pollution control management measures was determined. Results showed that the amounts of TP in the Guishui River basin was lower than that of TN, showing a fluctuating downward trend, and the spatial distribution of TP and TN was high in the central and low in the north and southeast. Compared the effect of management measures, it was found that process interception measures were more effective than source control and...