黄土包气带水分绕流条件下核素迁移的数值模拟  

NUMERICAL SIMULATION ON MIGRATION OF NUCLIDES UNDER WATER BYPASSING CONDITION IN LOESS AERATED ZONE

作　　者：钱天伟[1] 王金生[2] 焦志兰[3] 刘春国[4] 武贵斌[3] 

机构地区：[1]太原科技大学环境科学研究所,030024 [2]北京师范大学环境科学所,100875 [3]中国辐射防护研究院,太原030006 [4]中国地震台网中心,北京100036

出　　处：《辐射防护》2005年第6期334-339,368,共7页Radiation Protection

基　　金：中国辐射防护研究院(CIRP);日本原子力研究所(JEARI)的国际合作项目(073030006);山西省高等学校青年学术带头人项目;山西省自然科学基金(20051060);王宽诚博士后基金;中国博士后基金等资助

摘　　要：本文针对包气带黄土-石英砂介质中出现的水分绕流现象,采用了剖面二维水流数值模式进行了模拟;利用黄土对3H几乎不吸附的特点,采用3H的野外迁移试验资料验证流场。随后模拟了90Sr在黄土包气带中的迁移,模拟过程中将源直接放在石英砂周围的黄土结点上。对90Sr在包气带迁移的数值模拟结果显示了与实验结果相符的双峰现象,表明介质的差异可能是导致90Sr浓度双峰现象的主要原因。Aim at the bypass-flow phenomena appeared in medias of loess and quardz sands in aerated zone, this paper successfully uesed two-dimensional unsaturated flow model to simlate. Based on the characteritic of non-absorption of ^3H onto loess, the data of ^3H in field migration test were used to verify simulated flow field. After that, the migration of ^90Sr in aerated zone of loess was simulated. In this simulated procedure the source term was directly put on the loess nodes around quartz sands, which overcome the numerical surge and simulate the double concentration peaks of ^90Sr successfully.

关 键 词：数值模拟 核素 包气带 ^90SR ^3H 黄土 石英砂 绕流 双峰 

分 类 号：TL942[核科学技术—辐射防护及环境保护]