【摘要】 通过建立高放废物处置预选场研究区水文地质迁移模型,分析pH、弥散度、扩散系数和温度等各种不同的影响因素在模拟中所起的作用。讨论研究了花岗岩地下水中铀扩散吸附时的弥散度、扩散系数、渗流速度、地下水化学成分等参数,并用批式法测定了铀在研究区花岗岩粉末中的分配系数。同时运用美国地质调查局的水文地球化学模拟软件PHREEQC-Ⅱ模拟和预测铀元素进入花岗岩地下水后的浓度分布和迁移情况。结果表明,铀在研究区地下水中迁移主要受pH值、弥散度、扩散系数的影响。更多还原

【Abstract】 Choosing a preselected high level radioactive waste disposal site as study area,a hydrogeologic migration function is constructed.Several hydrogeologic parameters such as vertical dispersity,diffusion coefficient,flow velocity,simulated groundwater concentrations are discussed,and distribution coefficient of granites particles in the study area was measured by using batch method.Meanwhile the conditions after the uranium entered into the groundwater were simulated and predicted by using American hydrologic modeling software PHREEQC-Ⅱ.The different roles of the various influential factors such as the pH values,dispersity and diffusion coefficient in the simulation are analyzed.The results show that pH values,dispersity and diffusion coefficient have an important influence on the nuclide migration in the groundwater of study area.更多还原