loading page

Solute transport in heterogeneous sediments: experimental and theoretical investigations
  • +5
  • Ziqi Ma,
  • Zhenxue Dai,
  • Xiaoying Zhang,
  • Chuanjun Zhan,
  • Huili Gong,
  • Lin Zhu,
  • Corey D Wallace,
  • Mohamad Reza Soltanian
Ziqi Ma
Jilin University
Author Profile
Zhenxue Dai
Jilin University
Author Profile
Xiaoying Zhang
Jilin University
Author Profile
Chuanjun Zhan
Jilin University
Author Profile
Huili Gong
Capital Normal University
Author Profile
Lin Zhu
Capital Normal University
Author Profile
Corey D Wallace
University of Cincinnati
Author Profile
Mohamad Reza Soltanian
University of Cincinnati
Author Profile

Abstract

Abstract: Heterogeneity is crucial for predication of flow and contaminant transport in subsurface formations. To characterize the heterogeneous architecture, the relationship between multimodal correlation of hydraulic conductivity (K) and plume dispersion is investigated through integration of experimental, theoretical, and numerical simulation approaches. The spatial correlation structure of K in a heterogeneous sedimentary column is investigated by analyzing the covariance components and transition probability structures. The detailed sedimentary facies data of the column ensures the accuracy of heterogeneous sediment characterization. Lagrangian-based transport models were developed to estimate solute dispersion in non-reactive tracer injection experiments. The results show that the model successively predict the solute transport when the spatial correlation structure is well-defined. Dispersivity estimated by the Lagrangian-based model slightly larger than those obtained from the measurements of tracer experiments. Further, the upscaled dispersivity that derived from transition probability is dominated determined by the cross-transition probability structure, while the contribution of auto-transition terms are quite small. The contribution of the cross-transition terms increases with the increasing contrast in mean permeability between different facies. Numerical modeling results confirm that upscaled dispersivity values well capture solute breakthrough behavior along the heterogeneous sediment column. Keywords: Solute transport; Dispersion; Dispersivity; heterogeneity; porous media; Sedimentary structure; Column experiment; Lagrangian-based model.