Numerical modeling of contaminant advection impact on hydrodynamic diffusion in a deformable medium

Wang, Chunguang; Shu-qing, Liu; Shi, Xingkai; Cui, Guanglei; Wang, Hongxu; Xing, Jun; Fan, Kunkun; Hu, Songtao

doi:10.1016/j.jrmge.2021.09.009

Cited by 9 publications

(2 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, it is essential to address it during the initial stage of water quality correction [34]. Bottom benthic flux or sediment oxygen demand (SOD) is a reaction that occurs only in the sedimentary and bottom layers of water, affecting the surface layer via advection and diffusion [35]. However, in a water area with a weak flow, such as the Saemangeum Lake, vertical effects such as bottom elution or SOD may be sensitive, but the effect may not propagate to the surface layer and continue to affect the bottom layer.…”

Section: Model Constructionmentioning

confidence: 99%

An Improved Model for Water Quality Management Accounting for the Spatiotemporal Benthic Flux Rate

Kim

Park

2023

Water

View full text Add to dashboard Cite

Although water quality models provide useful interpretations for water quality management, it is critical to accurately input and simulate the flux rate, which varies with space and time. In the Environmental Fluid Dynamics Code model, the flux rate value set does not consider spatiotemporal variability. The water quality of the Saemangeum freshwater lake in Korea is poor despite quality improvement measures. In this study, the model was improved by considering the characteristics of flux rates that change spatiotemporally based on environmental conditions and factors influencing the benthic layer. An exponential relational expression was generated and applied to the model while considering the aerobic, anaerobic, and influencing factors. Results from four important sites in the Saemangeum Reservoir were compared with the RSR, %Difference, and AME results of the previous model for evaluating the reproducibility of the improved model. Calibration and verification of the model were performed in 2013 and 2016, respectively. The improved model yielded values close to the optimal value after computing the evaluation functions of both models. It had excellent reproducibility and simulated water quality by reflecting a reasonable value for the benthic flux rate. The improved model can be extended to evaluate other water bodies in the future.

show abstract

Section: Model Constructionmentioning

confidence: 99%

An Improved Model for Water Quality Management Accounting for the Spatiotemporal Benthic Flux Rate

Kim

Park

2023

Water

View full text Add to dashboard Cite

show abstract

“…Comprehensive, simple, and reliable fully coupled HMC models have been developed to investigate the behavior of soilwater-contaminant system. 4 Due to the complexity and difficulty of model equations, numerical methods are commonly used to obtain solutions, [8][9][10][11] which play a great role in practical engineering. However, it is worth noting that high-precision numerical results are restricted by many factors, such as grid size, time step, element type, discrete method, iteration algorithm et al In order to obtain a more intensive understanding of the scientific phenomena, analytical solutions become an important alternative option.…”

mentioning

confidence: 99%

Analytical solutions for a fully coupled hydraulic‐mechanical‐chemical model with non‐zero initial concentration of contaminant

Lin

Zhang

2023

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

Analytical solutions for coupled problems are very significant for both understanding the physical mechanism and verifying the numerical methods. However, existing solutions usually focus on advection‐dispersion models without considering the coupling effect of contaminant transport or partial‐coupled models with the zero initial concentration (ZIC) condition, which are impractical in many engineering applications. This paper proposes novel analytical solutions to solve the non‐zero initial concentration (NZIC) problem for a fully‐coupled hydraulic‐mechanical‐chemical (HMC) model by Fourier transform. The proposed analytical solutions are highly competent and efficient compared with existing solutions from the literature. The solutions are applied to investigate the long‐term contaminant transport behavior and consequent deformation of clay liner under NZIC conditions. Results show that the presence of NZIC greatly promotes contaminant ions migration and shorten breakthrough time. The higher the initial concentration, the shorter the breakthrough time. When the initial concentration is increased by 3 and 5 times, the corresponding breakthrough time is reduced by 23.9 and 27.1 years, respectively. In practical engineering, neglecting the NZIC of contaminant can lead to an overestimation of performance efficiency of clay liners.

show abstract

One‐Dimensional Fully Coupled Hydro‐Mechanical‐Chemical Model for Contaminant Transport Under Step‐Loading Condition and Its Analytical Solutions

Zhou,

Zhang,

Han

et al. 2024

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

Stepped dumpling of waste is the main operating method used in landfill engineering. For the liners located at the bottom of the landfill, the waste can be considered as a vertical loading due to its heavy weight, causing compressive deformation of the liners and, most importantly, tending to lose the effectiveness of the geomembrane with the differential deformation. However, most experiments or numerical models use transient‐loading and ignore the influence of variable step‐loading on liner performance. In this study, a one‐dimensional fully coupled hydro‐mechanical‐chemical (HMC) model for contaminant transport under the framework of small strain, taking into account the step‐loading effect, is proposed, and its analytical solutions are derived by using the separation of variables. The behavior of contaminant transport in a single‐layer clay liner is investigated under variable step‐loading conditions. Analytical results show that the step‐loading can significantly accelerate the transport of contaminants compared to the transient‐loading. Variation of the step‐loading rate from 2 to 4 times yields an increase of 6.1 and 15.2 years of the breakthrough time. At a step‐loading rate of 50 kPa/year, the breakthrough increases by 13.37 years, and the peak settlement reduces to half that under transient‐loading. Ignoring the influence of step‐loading on contaminant transport may overestimate the performance of clay liners.

show abstract

Numerical modeling of contaminant advection impact on hydrodynamic diffusion in a deformable medium

Cited by 9 publications

References 62 publications

An Improved Model for Water Quality Management Accounting for the Spatiotemporal Benthic Flux Rate

An Improved Model for Water Quality Management Accounting for the Spatiotemporal Benthic Flux Rate

Analytical solutions for a fully coupled hydraulic‐mechanical‐chemical model with non‐zero initial concentration of contaminant

One‐Dimensional Fully Coupled Hydro‐Mechanical‐Chemical Model for Contaminant Transport Under Step‐Loading Condition and Its Analytical Solutions

Contact Info

Product

Resources

About