Uncertainty Analysis of Heavy Metal Contamination Assessment in Daxia River Basin

摘要

According to the heavy metal content of the Daxia River Basin, the pollutant carrying capacity and pollution assessment were calculated. A simulation coverage rate parameter was introduced to construct an uncertainty analysis method for a complete watershed model. Applying the geoaccumulation index method assessed the status of heavy metal pollution of the Daxia River Basin. The results show that the average annual pollutant carrying capacity of Pb, Cr, Cd, As, and Cu are 6.4099 t/a, 25.6762 t/a, 4.8257 t/a, 5.9850 t/a, and 43.7648 t/a, which indicates that the Daxia River Basin does not exceed the standard. Nine river sections have a very strong pollutant carrying capacity, and six river sections have a strong pollutant carrying capacity, and one river section has a neutral pollutant carrying capacity. Based on correlation analysis, the fully-mixed model under steady-state conditions is reasonable for the pollution assessment in small and medium river basins.