Mahmoudzadeh Batoul, Liu Longcheng, Moreno Luis, Neretnieks Ivars
Department of Chemical Engineering and Technology, Royal Institute of Technology, S-100 44 Stockholm, Sweden.
Department of Chemical Engineering and Technology, Royal Institute of Technology, S-100 44 Stockholm, Sweden.
J Contam Hydrol. 2014 Aug;164:59-71. doi: 10.1016/j.jconhyd.2014.05.011. Epub 2014 Jun 5.
A model is developed to describe solute transport and retention in fractured rocks. It accounts for advection along the fracture, molecular diffusion from the fracture to the rock matrix composed of several geological layers, adsorption on the fracture surface, adsorption in the rock matrix layers and radioactive decay-chains. The analytical solution, obtained for the Laplace-transformed concentration at the outlet of the flowing channel, can conveniently be transformed back to the time domain by the use of the de Hoog algorithm. This allows one to readily include it into a fracture network model or a channel network model to predict nuclide transport through channels in heterogeneous fractured media consisting of an arbitrary number of rock units with piecewise constant properties. More importantly, the simulations made in this study recommend that it is necessary to account for decay-chains and also rock matrix comprising at least two different geological layers, if justified, in safety and performance assessment of the repositories for spent nuclear fuel.
开发了一个模型来描述溶质在裂隙岩石中的运移和滞留。该模型考虑了沿裂隙的对流、从裂隙到由多个地质层组成的岩石基质的分子扩散、在裂隙表面的吸附、在岩石基质层中的吸附以及放射性衰变链。通过使用德胡格算法，可以方便地将流动通道出口处拉普拉斯变换浓度的解析解转换回时域。这使得人们能够轻松地将其纳入裂隙网络模型或通道网络模型，以预测核素在由任意数量具有分段恒定性质的岩石单元组成的非均质裂隙介质中的通道运移。更重要的是，本研究中的模拟表明，在乏核燃料储存库的安全和性能评估中，如果合理的话，有必要考虑衰变链以及至少包含两个不同地质层的岩石基质。
