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Volume 7 Issue 2
Jul.  2019
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YAN Xiao-san, QIAN Jia-zhong, MA Lei. 2019: Experimental study on the velocity-dependent dispersion of the solute transport in different porous media. Journal of Groundwater Science and Engineering, 7(2): 106-114.
Citation: YAN Xiao-san, QIAN Jia-zhong, MA Lei. 2019: Experimental study on the velocity-dependent dispersion of the solute transport in different porous media. Journal of Groundwater Science and Engineering, 7(2): 106-114.

Experimental study on the velocity-dependent dispersion of the solute transport in different porous media

  • The hydrodynamic dispersion is an important factor influencing the reactive solute transport in the porous media, and many previous studies assumed that it linearly varied with the average velocity of the groundwater flow. Actually, such linear relationship has been challenged by more and more experimental observations, even in homogeneous media. In this study, we aim to investigate the relationship between hydrodynamics dispersion and the flow velocity in different types of porous media through a laboratory-controlled experiment. The results indicate that (1) the dispersion coefficient should not be a linear function of the flow velocity when the relationship between the flow velocity and the hydraulic gradient can be described by Darcy’s law satisfactorily; (2) Power function works well in describing the dispersion coefficient changing with the flow velocity for different types of porous media, and the power value is between 1.0-2.0 for different particle sizes.
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