基于SWAT模型的金属矿区雨水径流中锰污染负荷分析

Analysis of manganese pollution load of rainfall runoff in manganese ore zone based on SWAT model

通过改进林玉环的汞迁移转化一维模型,并在一定的基本假设下,得到了锰的一维迁移转化动力学模型,利用Fortran语言编程嵌入SWAT模型源程序,在参数敏感性分析后进行改进模型的率定与校正以及敏感性参数的调节分析后,得到金属矿区雨水径流中锰污染负荷分析的SWAT改进模型。运行结果表明,SWAT改进模型能够对雨水径流中锰污染负荷进行较高精度的模拟,其中回归系数(r2)、Nash-Sutcliffe效率系数(Ens)分别为0.88、0.91,符合回归系数和Nash-Sutcliffe系数的评价标准(r2≥0.6,Ens≥0.5),获得锰矿区的污染关键区,与实际矿区污染相符合,为锰矿区及其他金属矿区雨水径流中重金属污染的评测和控制、治理与修复等提供科学依据。

Based on the modification of the one-dimensional mercury transformation model,the kinetics model of manganese migration and transformation was established under some basic assumptions.Subsequently,the model was written in Fortran and embedded in the SWAT model.The modified model was calibrated and validated through parameter sensitivity analysis,the key parameters were adjusted until the model achieved the desired fitting result,after then,the modified SWAT model could be used for analysis of manganese pollution load of rainfall runoff in manganese ore zone.Results showed that the modified SWAT model exhibited a perfect accuracy in prediction the pollution load of manganese,the regression coefficients（r2）and Nash-Sutcliffe efficiency coefficients（Ens）was 0.88 and 0.91 respectively,which satisfy the requirement of evaluation criteria（r2≥0.6,Ens≥0.5）.With the help of modified SWAT model,the key contaminated areas of manganese ore district were obtained,which was consistent with actual situation.This study would give a theoretical and scientific basis for evaluation,control,management and restoration of the heavy metal pollution from the manganese mines and other non-ferrous metal mines.