Preprints
https://doi.org/10.5194/hess-2022-372
https://doi.org/10.5194/hess-2022-372
 
21 Nov 2022
21 Nov 2022
Status: this preprint is currently under review for the journal HESS.

A General Model of Radial Dispersion with Wellbore Mixing and Skin Effect

Wenguang Shi1, Quanrong Wang1,2,3, Hongbin Zhan4, and Renjie Zhou5 Wenguang Shi et al.
  • 1School of Environmental Studies, China University of Geosciences, 388 Lumo Road, Wuhan 430074, China
  • 2State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution, Ministry of Ecology and Environment, Wuhan, Hubei 430074, PR China
  • 3Hubei Key Laboratory of Yangtze River Basin Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan, Hubei 430074, PR China
  • 4Department of Geology and Geophysics, Texas A& M University, College Station, TX 77843-3115, USA
  • 5Department of Environmental and Geosciences, Sam Houston State University, Huntsville, TX 77340, USA

Abstract. The mechanism of radial dispersion is important for understanding reactive transport in the subsurface and for estimating aquifer parameters required in the optimization design of remediation strategies. Many previous studies demonstrated that injected solute firstly experienced a mixing process in the injection wellbore, then entered a skin zone after leaving the injection wellbore, and finally moved into the aquifer through advective, diffusive, dispersive, and chemical-biological-radiological processes. In this study, a physically-based new model and associated analytical solutions in Laplace domain are developed by considering the mixing effect, skin effect, scale effect, aquitard effect and media heterogeneity (in which the solute transport is described in a mobile-immobile framework). This new model is tested against a finite-element numerical model and experimental data. The results demonstrate that the new model performs better than previous models of radial dispersion in interpreting the experimental data. To prioritize the influences of different parameters on the breakthrough curves, a sensitivity analysis is conducted. The results show that the model is sensitive to the mobile porosity and wellbore volume, and the sensitivity coefficient of wellbore volume increases with the well radius, while it decreases with increasing distance from the wellbore. The new model represents the most recent advancement on radial dispersion study that incorporates a host of important processes that are not taken into consideration in previous investigations.

Wenguang Shi et al.

Status: open (until 16 Jan 2023)

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Wenguang Shi et al.

Wenguang Shi et al.

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Short summary
The mechanism of radial dispersion is important for understanding reactive transport in the subsurface and for estimating aquifer parameters required in the optimization design of remediation strategies. A general model and associated analytical solutions are developed in this study. The new model represents the most recent advancement on radial dispersion studies and incorporates a host of important processes that are not taken into consideration in previous investigations.