| 237Np和238Pu在黄土地下水中迁移的数值模拟 |
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| 引用本文： | 郭敏丽,王金生,李书绅,王丽. 237Np和238Pu在黄土地下水中迁移的数值模拟[J]. 中国环境科学, 2002, 22(5): 477-480 |
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| 作者姓名： | 郭敏丽 王金生 李书绅 王丽 |
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| 作者单位： | 1. 北京师范大学环境科学研究所,环境模拟与污染控制国家重点联合实验室,北京,100875
2. 中国辐射防护研究院,山西,太原,030006 |
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| 基金项目： | CIRP和JAERI合作项目(Z1998041)，国家重点基础研究发展规划项目(G1999043606)，英国皇家协会资助项目(Q778) |
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| 摘 要： | 为了探索超铀核素在多孔介质中的迁移规律,为低中放固体废物近地表处置库的工程设计提供科学依据,在野外黄土试验场对237Np和238Pu进行了现场示踪试验,采用非平衡吸附模式的NESOR程序模拟了试验数据.结果表明,在含水层厚度6m以上更新世(Q3)马兰黄土中,土壤颗粒矿物以长石和石英为主,化学成分主要为SiO2,土壤颗粒以0.2~0.02mm为主的砂质黏壤土,干容重1.623t/m3,pH=8左右,总孔隙度0.42,阳离子交换容量12.17~28.26meq/100g的条件下,获得试验场黄土的纵向弥散度aL值为0.20~27.5cm,横向弥散度aT为0.05~1.0cm; 237Np的分配系数Kd值为198~451mL/g,238Pu的Kd值为450~1198mL/g;非平衡速率参数a范围为0.014~0.35d-1.
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| 关 键 词： | 黄土 地下水 超铀核素 数值模拟 |
| 文章编号： | 1000-6923(2002)05-0477-04 |
| 修稿时间： | 2001-12-29 |
Numerical simulation of 237Np and 238Pu migration in loess groundwater |
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| GUO Min-li,WANG Jin-sheng,LIShu-shen,WANG Li. Numerical simulation of 237Np and 238Pu migration in loess groundwater[J]. China Environmental Science, 2002, 22(5): 477-480 |
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| Authors: | GUO Min-li WANG Jin-sheng LIShu-shen WANG Li |
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| Affiliation: | GUO Min-li1,WANG Jin-sheng1,LIShu-shen2,WANG Li1 |
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| Abstract: | In order to provide scientific basis for designing near surface disposal of low and intermediate level radioactive solid waste, and quest for a pattern of transuraniums migration in porosity medium, the field tracing test of 237Np and 238Pu had been done in loess. The test data were simulated with NESOR program of non-equilibrium sorption model. The test was done in the upper Pleistocene Malan loess with aquifer thickness of 6m, the soil mineral is mainly composed offeldspar and quartzite with SiO2 as main chemical component, and the soil particle is mainly sandy clay loam with particle size of 0.2~0.02mm, bulk density is 1.623t/m3, total porosity is 0.42 and the positive ion exchange capacity is12.17~28.26meq/100g. The results shows that longitudinal dispersion coefficient(aL) of loess is 0.20~27.5cm, andtransverse dispersion coefficient(aT) is 0.05~1.0cm; the distribution coefficient(Kd) of 237Np is 198~451mL/g, and that of 238Pu is 450~1198mL/g; non-equilibrium sorption coefficient(a) is 0.014~0.35d-1. |
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| Keywords: | loess groundwater transuraniums numerical simulation |
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