典型农村小流域磷营养输移模拟研究

磷是湖泊水体富营养化的关键元素之一。农村小流域作为农业生产和生活污水的排放区域，磷的输出过程仍不清晰，难以量化。以直接入巢湖的小流域烔炀河流域为研究对象，结合流域自然汇水特征和行政区划划定了 24 个子流域网格单元，细化建立了以子流域为基本单元、以水量过程为基础驱动的流域磷营养输移数学模型。基于实测流量和自动站总磷浓度的过程对比检验表明，数学模型可以合理地模拟降水驱动下的小流域水量和磷营养变化过程，为量化流域磷营养的输出负荷、明确其关键来源和路径提供了科学工具。

Simulation study on phosphorus nutrient transport in typical rural watersheds

Phosphorus is a key element in eutrophication of lake water bodies. As a discharge area for agricultural production and domestic sewage, the output process of phosphorus is still unclear and difficult to quantify. The research focused on the Tongyang River Basin, a small watershed directly draining into Lake Chaohu. Utilizing the natural hydrological characteristics and administrative divisions of the watershed, 24 sub-watershed grid units were delineated. A refined mathematical model for phosphorus nutrient transport in the watershed was established, with each sub-watershed as the fundamental unit and driven by hydrological processes. The comparative test based on measured flow rate and total phosphorus concentration at automatic stations showed that the mathematical model can reasonably simulate the changes in water quantity and phosphorus nutrition in small watersheds driven by precipitation, providing scientific tools for quantifying the output load of phosphorus nutrition in watersheds, clarifying its key sources and pathways.