基于3维成像技术的河床介质形成过程研究

为了研究潜流交换过程中孔隙水流、颗粒运移和小尺度河床介质非均质性之间的相互关系,通过室内水槽试验,在利用X射线微断层扫描技术对实验样品进行扫描生成样品内部结构3维图像的基础上,运用格子波尔兹曼法对河床介质的形成过程进行模拟。研究结果表明:在河床介质的形成以及运移过程中,随着颗粒运移过程的发展,河床上部的渗透率逐渐增大,而随着细砂粒深入到介质内部,河床下部的渗透率逐渐减小。

Study of Formation Process Based on the Riverbed of Three-dimensional Imaging Technology Media

In order to study the flow exchange process in pore water, particle migration and small scale bed medium heterogeneity, through the flume experiment, using X ray microanalysis technique of computed tomography on experimental samples, it was generated by scanning the sample based on the internal structure of a three-dimensional image, using lattice Boltzmann method on riverbed medium formation process simulation. Research results showed that in the riverbed dielectric formation and migration process, with the particle transport process of development, the upper part of the river bed permeability increased gradually, with fine sand into the medium, the permeability decreases below the river bed.