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 sta-tions 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.
non-point source pollutionphosphorus elementsmall watershedsmathematical modelsrural areasChaohu Lake
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