【摘要】 针对2005年12月发生在北江流域的重金属镉污染事故,建立了一维河流重金属迁移转化模型,结合污染事故实测资料,对模型进行了参数率定和验证.从计算结果来看,当水体中镉浓度值较大时,重金属模型计算值与实测值拟合效果较好,而镉浓度值较低时,则拟合效果不理想,此外,水体中镉浓度随着水流运动由上游向下游递减,这说明重金属在吸附、沉降作用下逐步沉积到底泥中.更多还原

【Abstract】 In view of the cadmium pollution emergency in North River basin in Dec.2005,one-dimension heavy metal transport and transformation model in rivers is established.Combined with the observed data of the pollution emergency,the parameters of heavy metal model are calibrated and validated.The conclusions are that the simulation effect between calculated value and observed value is rather good when the concentration value of cadmium in water is comparatively big,and the simulation effect is not ideal when the concentration value of cadmium is comparatively small.Furthermore,cadmium concentration of water body is decreased from upper reaches to lower reaches,and it shows that the heavy metal is subsided into the mud by the absorption and sedimentation actions.更多还原