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首页> 外文会议>2010 IEEE Nuclear Science Symposium : Conference Record >Studying contaminant transport and chem ical reduction in subsurface sediment by modeling flow in porous media
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Studying contaminant transport and chem ical reduction in subsurface sediment by modeling flow in porous media

机译：通过模拟多孔介质中的流动来研究地下沉积物中的污染物迁移和化学还原

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This paper presents imaging and modeling aspects of an interdisciplinary study of subsurface pollution and environmental remediation. F18 — FDG PET and Tc99m — NaTcO4 SPECT studie s were performed to follow dynamic changes in the radiotracer distribution in model systems. Radioisotope solution was pumped through the test columns filled with sand or sediment in order to reproduce subsurface conditions of groundwater flow through satu rated sediment layers. Dynamic sequences of the radiotracer distribution were acquired and analyzed. The ultimate goal was to measure porosity and parameters of the sediment and, in the future, to study radiotracer immobilization in the column through reductive precipitation. In order to extract the relevant information from the dynamic images, computational fluid dynamics model of the liquid flow in porous medium were designed and implemented. Qualitative similarities between the imaged and simulated radio tracer distributions were achieved with appropriate values of the computational mesh, the local medium permeability, and other model parameters.
机译：本文介绍了地下污染和环境修复跨学科研究的成像和建模方面。进行F18-FDG PET和Tc99m-NaTcO 4 SPECT研究，以追踪模型系统中放射性示踪剂分布的动态变化。放射性同位素溶液被泵送通过充满沙子或沉积物的测试柱，以再现通过饱和沉积物层的地下水的地下条件。获取并分析了放射性示踪剂分布的动态序列。最终目标是测量沉积物的孔隙率和参数，并在将来研究通过还原性沉淀将放射性示踪剂固定在色谱柱中。为了从动态图像中提取相关信息，设计并实现了多孔介质中液体流动的计算流体动力学模型。利用计算网格，局部介质渗透率和其他模型参数的适当值，可以实现成像的和模拟的无线电示踪剂分布之间的定性相似性。

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