地下水中石油类污染物运移模拟研究＊

针对我国北方某油田的地下水特点,通过室内土柱模拟实验与数值模型模拟研究了石油类污染物随地下水运移的状况。模拟结果表明,地下水石油类污染物浓度随时间变化曲线总体上呈S型;污染前期地下水中污染物浓度增加较快,随着浓度的不断累积,后期浓度增加缓慢。计算结果显示,在50m处石油类污染物首次超过浓度限值的时间为586d,1000m处石油类污染物首次超过浓度限值的时间为12590d,污染过程表现出一定的滞后性。可见,吸附作用对石油类污染物迁移的影响很大,阻滞和延迟了污染物的迁移。

Simulation Research on Groundwater Transportation

Based on analysis of an oil field in North China,laboratory simulation of soil column and numerical model simulation were used to analyze the petroleum pollutants transportation with groundwater. The simulation results showed that change curve of the pollutants concentration versus time was type-S; the pollutants concentration of groundwater increased rapidly at first,but with the pollutants concentration cumulated,the concentration increased slowly in the late experiment. The calculation results showed that 586 days was the time that pollutants concentration exceeded the concentration limit at the distance of 50m with 12590 days at the distance of 1000m. The pollution process showed the character of hysteresis. The results showed that absorption affected petroleum pollutants transportation greatly with block and delay.