核素迁移柱法实验和模拟计算  

The column experiment and numerical simulation for nuclide migration

作　　者：司高华[1] 于静[1] 刘东旭[1] 周旭[1] 胡之茜[1] 

机构地区：[1]西北核技术研究所,西安710024

出　　处：《环境化学》2013年第3期481-485,共5页Environmental Chemistry

摘　　要：提出了一种计算土柱实验中核素迁移参数的方法,并采用脉冲源法测定了核素在土柱中的水流速度、弥散系数,使用计算软件对核素的流出曲线进行了数值模拟,并对影响核素流出时间的参数进行了灵敏度分析.结果表明,在本实验条件下,CXTFIT程序能对实验值给出很好的拟合,含有化学平衡吸附的对流-弥散模型可较好地模拟核素在土柱中的运移特性,水流速度对核素的流出时间影响最大.A calculating method for the transport parameters in the soil column experiments was proposed.Using the pulsed source method,the water flow rate and diffusion coefficients in the soil columns were determined,the transport of radionuclides was simulated by software,and the sensitivity analysis of parameters for through time was also calculated.The results showed that under the experimental conditions,CXTFIT program can fit well the experimental value,the convection-diffusion model containing the chemical equilibrium adsorption can simulate well the migration characteristics of radionuclides in the soil column,and the radionuclide outflow time was mainly influenced by water flow speed.

关 键 词：土柱实验 CXTFIT 迁移 

分 类 号：X830.2[环境科学与工程—环境工程]