汞污染河流底质迁移模式研究

对蓟运河下游汞污染底质迁移过程的研究表明:在水流作用下,底质的重新悬移在其过程中起主要作用.在过去七年中,由这一作用带入渤海的汞为16.6t.本文提出了一种数学模式来描述这一过程.与实测数据对比,模式计算结果具有较好的精度(误差为16.4％)和重现性.用模式预测出底质中汞浓度降至目前二分之一所需时间为9—10年.

A STUDY ON MATHEMATICAL MODELLING OF TRANSPORT OF MERCURY-POLLUTED SEDIMENT IN JIYUN RIVER

A mathematical model which can be used to describe the process of mercury transport in river is proposed in this work. This model is used to investigate the transport part of mercury-polluted sediment in lower stream of the river. The calculated results show that resuspension of the polluted sediments by flow is an important effect in clean-up of the river, which has been dumped an amount of 16.6 tons mercury during past seven years. A comparison of the data obtained from model calculation and the field survey shows that model is acceptable, error being about 16.4%, and recurrence even better. It has been used to predict the possibility and the time required for effective purification of the river. It will take about nine years before the concentration of mercury in the sediments can be reduced to one half of the concentration that now exists.