核素在非饱和带中迁移的非平衡吸附数值模式——NESOR

NESOR——A NUMERICAL MODEL FOR RADIONUCLIDE MIGRATION IN UNSATURATED ZONE WITH NON EQUILIBRIUM SORPTION

本文将对流弥散方程与非平衡吸附关系式相结合 ,开发了核素在非饱和孔隙介质中迁移的二维非平衡吸附数值模式与计算机程序—— NESOR,给出了 NESOR中使用的吸附、解吸速率参数的计算方法。对中国辐射防护研究院 (CIRP)野外包气带黄土试验场 F坑 85Sr两年的迁移试验资料和同步测得的黄土剖面的含水量资料 ,分别用 NESOR模式及二维饱和 -非饱和溶质迁移的平衡吸附模式 FEMWASTE进行了模拟计算。结果表明 :NESOR的模拟结果比

The convection dispersion equation is coupled with non equilibrium sorption equation and a corresponding two dimension numerical model, NESOR, is developed. The calculating algorithm for sorption/desorption rate coefficient adopted in the model is presented. To validate the model, NESOR was tested using the field monitoring data of 85 Sr migration in unsaturated loess in test pit F at the CIRP's Field Test Site. Another two dimension finite element model for radionuclide transport through saturated and unsaturated porous media with equilibrium sorption, FEMWASTE, was also used for comparison. The solution indicated that NESOR gives better simulation results than FEMWASTE for our test case. (