非达西裂隙流对渗透性基岩中流场及溶质羽的影响

李一鸣; 文章

doi:10.3799/dqkx.2018.345

Volume 45 Issue 2

Feb. 2020

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Li Yiming, Wen Zhang, 2020. Impacts of Non-Darcian Flow in the Fracture on Flow Field and Solute Plumes in a Fracture-Aquifer System. Earth Science, 45(2): 693-700. doi: 10.3799/dqkx.2018.345

Citation:

Li Yiming, Wen Zhang, 2020. Impacts of Non-Darcian Flow in the Fracture on Flow Field and Solute Plumes in a Fracture-Aquifer System. Earth Science, 45(2): 693-700. doi: 10.3799/dqkx.2018.345

Li Yiming, Wen Zhang, 2020. Impacts of Non-Darcian Flow in the Fracture on Flow Field and Solute Plumes in a Fracture-Aquifer System. Earth Science, 45(2): 693-700. doi: 10.3799/dqkx.2018.345

Citation:

Li Yiming, Wen Zhang, 2020. Impacts of Non-Darcian Flow in the Fracture on Flow Field and Solute Plumes in a Fracture-Aquifer System. Earth Science, 45(2): 693-700. doi: 10.3799/dqkx.2018.345

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Impacts of Non-Darcian Flow in the Fracture on Flow Field and Solute Plumes in a Fracture-Aquifer System

doi: 10.3799/dqkx.2018.345

Li Yiming^,,
Wen Zhang^{,
,}

School of Environmental Studies, China University of Geosciences, Wuhan 430074, China

Received Date: 2018-12-27
Publish Date: 2020-02-15

Abstract

Abstract

In this study, a mathematical model with the intersection angle between the flow direction and the x axial direction of 45degree was developed to investigate the effect of non-Darcy parameter n on flow field and solute migration when flow is oblique crossing the fracture. The Comsol Multiphysics software was used to do such numerical simulation. The simulation area was assumed to be square with a horizontal fracture embedded in the middle.The flow in the fracture was assumed to be non-Darcian and can be described by the Izbash equation. A constant solute source has been assigned in the upper matrix. The results indicate the following phenomena as the power index in the Izbash equation(n) increases:(1) the fracture flow velocity increases, and the flow line at the matrix-fracture interfaces gradually deviates from the classical fraction law; (2) the flow direction in fracture gradually turns to the direction in the matrix; (3) the width of solute plume increases, while the symmetry of solute plume reduces; (4) the peak solute concentration in the horizontal section diminishes, and the solute concentration on the right sight of the model increases; (5) the effect of back dispersion caused by fracture on solute plume becomes stronger, which results in more solutes in the fracture migrated to the upper matrix. Overall, the non-Darcy flow fracture has a significant impact on the flow field and solute distribution.
- heterogeneous media,
- preferential flow region,
- Izbash equation,
- solute transport,
- solute plume,
- environmental geology

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References

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Impacts of Non-Darcian Flow in the Fracture on Flow Field and Solute Plumes in a Fracture-Aquifer System

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