浓度及渗流速度变化时污染物运移过程的求解

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摘要基于稳态情形下的解析解，得到污染物浓度及渗流速度随时间变化的非稳态情形下的近似解，并与稳态情形下的计算结果进行验证分析.计算表明，随时间离散间距减小，所得近似解的精确度显著提高.算例分析表明，阻滞因子对污染物吸附量有较大影响，随解吸因子与吸附因子差值的增大，污染物的吸附量逐渐增大.例如，当吸附因子为1.7，解吸因子为1时，污染物吸附量可达到30%.而且，随吸附因子的增大，污染物穿透曲线的峰值减小，而峰值出现时刻也相应滞后.弥散度对吸附量的影响较小，但对污染物的穿透曲线形态有较大影响.随弥散度增大，污染物穿透过程延长，且污染物迁移过程主要受渗流速度影响.

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	郭志光
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关键词 ：污染物运移, 非稳定流, 非均衡吸附, 多孔介质, 迁移过程

Abstract：A theoretical solution suitable for the variable concentration of contaminant and seepage velocity with time was deduced using an analytical solution for steady-state situation. The proposed model was verified by comparing with the analytical solution in the case of steady state. Analytical results indicated that the calculation precision increases with the decrease of the interval of discrete time. A typical case showed that retardation factor had an obvious influence on the adsorption effect of contaminant. For example, when absorption factor was 1.7 and desorption factor was 1, the rate of adsorbed contaminant within porous medium could reach 30%. Moreover, the adsorption capacity of porous medium increased with the increase of the difference between adsorption factor and desorption factor. The peak value of the breakthrough curve of contaminant decreased with the increase of adsorption factor, and its occurrence time was relatively lagged. The degree of dispersion had little effect on the adsorption capacity, but had an apparent influence on the shapes of penetration curves.

Key words： transport of contaminant unsteady flow non-equilibrium adsorption porous medium migration process

收稿日期: 2016-06-07

PACS:

X703.5

基金资助:国家自然科学基金资助项目（51678043，51478034）

通讯作者: 白冰,教授,baibing66@263.net E-mail: baibing66@263.net

作者简介: 郭志光(1987-),男,河北邢台人,北京交通大学博士研究生,主要从事复杂环境条件下岩土介质力学特性的研究.发表论文1篇.

引用本文:

郭志光, 白冰. 浓度及渗流速度变化时污染物运移过程的求解[J]. 中国环境科学, 2017, 37(2): 613-619. GUO Zhi-guang, BAI Bing. A solution for the migration process of contaminant in porous media considering the variation of concentration and seepage velocity. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(2): 613-619.

链接本文:

http://manu36.magtech.com.cn/Jweb_zghjkx/CN/ 或 http://manu36.magtech.com.cn/Jweb_zghjkx/CN/Y2017/V37/I2/613

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