Cited by 31Groundwater flow and contamination studiesGroundwater and Isotope GeochemistryKarst Systems and Hydrogeology

Numerical investigation of coupled density-driven flow and hydrogeochemical processes below playas

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Hamann, Enrico, Post, Vincent, Kohfahl, Claus, Prommer, Henning, Simmons, Craig T.·2015·Water Resources Research

Abstract

Numerical modeling approaches with varying complexity were explored to investigate coupled groundwater flow and geochemical processes in saline basins. Long‐term model simulations of a playa system gain insights into the complex feedback mechanisms between density‐driven flow and the spatiotemporal patterns of precipitating evaporites and evolving brines. Using a reactive multicomponent transport model approach, the simulations reproduced, for the first time in a numerical study, the evaporite precipitation sequences frequently observed in saline basins (“bull's eyes”). Playa‐specific flow, evapoconcentration, and chemical divides were found to be the primary controls for the location of evaporites formed, and the resulting brine chemistry. Comparative simulations with the computationally far less demanding surrogate single‐species transport models showed that these were still able to replicate the major flow patterns obtained by the more complex reactive transport simulations. However, the simulated degree of salinization was clearly lower than in reactive multicomponent transport simulations. For example, in the late stages of the simulations, when the brine becomes halite‐saturated, the nonreactive simulation overestimated the solute mass by almost 20%. The simulations highlight the importance of the consideration of reactive transport processes for understanding and quantifying geochemical patterns, concentrations of individual dissolved solutes, and evaporite evolution.

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  • Due to the density contrast between brine and inflowing freshwater, a saline interface with a mixing zone is commonly present at the margins of the salt flat.

    “Due to the density contrast between the brine formed over long periods of time by evaporation and the inflowing freshwater from the mountains, a saline interface with a mixing zone is commonly present at the margins of the salt flat [15-18].”

    From Toward a Localized Water Footprint of Lithium Brine Extraction: A Case Study from the Salar de Atacama (2025) · cites this paper as [18]

    Section 3.1, “General Flow and Density Patterns” (page unavailable), describes freshwater flowing toward the evaporation zone, brine circulating below it, and dispersive mixing along their interface. The Introduction explains that evaporation makes inflowing water saline. The paper does not establish that such a mixing zone is commonly present specifically at salt-flat margins or that the freshwater comes from mountains. (LLM, conf=0.83)

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2 of the 78 references couldn’t be matched to a known paper.

Research works printed but not linked: 2

  1. [44]44. Rosen, M. R. (1991), Sedimentological and geochemical constraints on the evolution of Bristol Dry Lake Basin, California, USA, Paleogeogr. Paleoclimatol. Paleoecol., 84(1-4), 229-257.
  2. [55]55. Smoot, J. P., and T. K. Lowenstein (1991), Depositional environments of non-marine evaporites, in Evaporites, Petroleum and Mineral Resour- ces, edited by J. L. Melvin, pp. 189-347, Elsevier, Amsterdam.

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Authors
Hamann, E., Post, V., Kohfahl, C., Prommer, H., & Simmons, C. T.
Affiliations
  • Carl von Ossietzky Universität Oldenburg (DE)
  • Flinders University (AU)
  • Instituto Geológico y Minero de España (ES)
  • Commonwealth Scientific and Industrial Research Organisation (AU)
Corresponding author
Hamann, Enrico
Venue
Water Resources Research
Published
2015-11
Volume
51
Issue
11
Pages
9338-9352
ISSN
  • 0043-1397 (ISSN-L)
  • 1944-7973
OpenAlex
W2273560920
Cited by
31
References
78
Citations by year
2026: 3 · 2025: 4 · 2024: 2 · 2023: 4 · 2022: 6 · 2021: 2 · 2020: 3 · 2019: 1 · 2018: 3 · 2017: 1 · 2016: 2
FWCI
1.44
Type
journal article
Language
en
Open access
Locations
  • Water Resources Research (publishedVersion)
  • UWA Profiles and Research Repository (UWA) (submittedVersion, other-oa)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
Funders
the German Research Foundation ((KO 3186/1-1))
Topics
  • Physical Sciences › Environmental Science › Environmental Engineering › Groundwater flow and contamination studies
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Groundwater and Isotope Geochemistry
  • Physical Sciences › Earth and Planetary Sciences › Earth-Surface Processes › Karst Systems and Hydrogeology
Keywords
gravity currents, hydrogeochemistry, playa, evaporite precipitation, brine chemistry, evapoconcentration, halite saturation, solute transport, groundwater flow

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