Effect of the system dimensionality on variable-density solute transport

YE Yu; CAI Fangmin; XIE Yifan; JING Miao; LU Chunhui

doi:10.16030/j.cnki.issn.1000-3665.202103015

2022 Vol. 49, No. 1

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Article navigation > Hydrogeology & Engineering Geology > 2022 > 49(1): 146-153

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YE Yu, CAI Fangmin, XIE Yifan, JING Miao, LU Chunhui. Effect of the system dimensionality on variable-density solute transport[J]. Hydrogeology & Engineering Geology, 2022, 49(1): 146-153. doi: 10.16030/j.cnki.issn.1000-3665.202103015

Citation:

YE Yu, CAI Fangmin, XIE Yifan, JING Miao, LU Chunhui. Effect of the system dimensionality on variable-density solute transport[J]. Hydrogeology & Engineering Geology, 2022, 49(1): 146-153. doi: 10.16030/j.cnki.issn.1000-3665.202103015

Effect of the system dimensionality on variable-density solute transport

1.
College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu　210098, China
2.
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, Jiangsu　210098, China
3.
Yangtze Institute for Conservation and Development, Hohai University, Nanjing, Jiangsu　210098, China

More Information

Corresponding author: LU Chunhui, clu@hhu.edu.cn

Received Date: 10 March 2021

Revised Date: 21 August 2021

Accepted Date: 15 November 2021

Publish Date: 15 January 2022

Abstract

Abstract

Investigation of groundwater variable-density flow and solute transport is usually limited in a 2D system. There are only a few studies performed in a 3D system. However, there are still studies showing differences in free convection between the 2D and 3D systems. This study systematically investigates the variable-density solute transport processes in the 2D and 3D systems through numerical simulations of SEAWAT-2000 and quantifies the system instability, solute spreading and dilution using the Sherwood number, spatial moments and dilution index. The results show that the separate fingers form in the 2D system while they are suppressed in the 3D system due to the enhanced diffusion. However, the instability is stronger and the convective infiltration is faster in the 3D system, which is not directly related to the fingering phenomenon. Furthermore, dilution is stronger in the 3D system, and it reaches to the maximum values at a faster rate in the 2D system. The traditional second central moment may lead to the wrong estimation of spreading and solute dilution in free convection and unstable solute transport. These outcomes help predict properly free convection and solute transport in three-dimensional natural aquifers.
- system dimensionality /
- free convection /
- instability /
- fingering /
- spreading /
- dilution /
- numerical simulation

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References

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