The study of groundwater pore-scale flow field characteristics is of great significance for the in-depth understanding of groundwater seepage and solute transport. However,the effect of the microstructure of porous media with different particle size characteristics on the pore-scale flow field is yet unclear. This paper constructs porous media with different particle size distribution characteristics and swelling degrees of solid particles using an iterative rearrangement algorithm. On this basis,the effects of the average particle size,particle size variance and solid particle swelling degrees on the characteristics of groundwater flow field are investigated. The results show that under the condition of the same porosity of the porous media,the mean particle size and particle size variance of solid grains have less influence on the flow field characteristics such as the heterogeneity and probability density distribution of flow velocity in porous media. However,in the same medium,when the expansion of solid particles causes a reduction in porosity,a smaller change in average particle size can have a significant effect on the above flow field characteristics. For example,when the expansion degree of solid particles increases,a slight increase in particle size will lead to a large rise in the proportion of the dominant flow area and the stagnant region at the same time,a significant enhancement in the heterogeneity of flow field,and a significant growth in the divergence degree of the flow velocity probability density distribution.
关键词
地下水流场特征/多孔介质/固体颗粒粒径/孔隙尺度/数值模拟/水文地质学
Key words
groundwater flow field characteristics/porous media/solid particle size/pore scale/numerical simulation/hydrogeology
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