Hydrogeochemistry Fundamentals and Advances

Tikhomirov, V. V.

doi:10.1002/9781119160434

Cited by 10 publications

(5 citation statements)

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“…In karst studies, the rock layer (and its caves) beneath HHB, which is at constant temperature T aw , has different names: "neutral zone" (Dublijanski, 1977), (Tikhomirov, 2016), "isothermal zone" (Crestani, 1939), and others. In this paper the term "homothermic zone" is used (as in Luetscher, 2004).…”

Section: Near-surface Ground Temperaturementioning

confidence: 99%

Geothermal flux and phreatic speleogenesis in gypsum, halite, and quartzite rocks

Badino¹

2018

IJS

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Abstract:The first layers of rock underground are in thermal contact with the external atmosphere mainly through infiltrating meteoric water. This relatively cool zone absorbs rising geothermal energy, which heats the water. If the aquifer consists of gypsum, halite or quartzite, the water at those depths is usually salt-saturated, so the increase in temperature renders the water aggressive again. This in turn leads to rock dissolution and formation of phreatic conduits. This way, the geothermal flow creates caves that do not necessarily reach the surface. This paper analyzes the speed of the excavation, which, in different types of rocks, depends only slightly on temperature and meteoric precipitation. The time scale of this speleogenesis appears to be similar to that of other known cave systems. These processes are probably able to greatly increase the permeability around underground radioactive waste storage in halite.geothermal flux, phreatic speleogenesis, hypogenic caves, evaporite, quartzite, radioactive waste storage

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Section: Near-surface Ground Temperaturementioning

confidence: 99%

Geothermal flux and phreatic speleogenesis in gypsum, halite, and quartzite rocks

Badino¹

2018

IJS

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“…6 ), adequate for the natural freshwater resources and explainable for those influenced by urbanization and agricultural activity widespread across the territory of sample net. Ions of HCO , Ca, Mg, SO , Na, Mg, being major macro constituents, are always presented in groundwater, their concentrations depend mostly on the mineral composition of rocks, although surrounding lands as well 73 . The presence of nitrogen forms in the ground and surface water can accompany the agricultural and landfill sites, relating to the migration of products of fertilizers, pesticides or domestic sewage decay 74 – 77 .…”

Section: Discussionmentioning

confidence: 99%

Regulation-based probabilistic substance quality index and automated geo-spatial modeling for water quality assessment

Nikitin

Tregubova

Shadrin

et al. 2021

Sci Rep

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Natural environments are recognized as complex heterogeneous structures thus requiring numerous multi-scale observations to yield a comprehensive description. To monitor the current state and identify negative impacts of human activity, fast and precise instruments are in urgent need. This work provides an automated approach to the assessment of spatial variability of water quality using guideline values on the example of 1526 water samples comprising 21 parameters at 448 unique locations across the New Moscow region (Russia). We apply multi-task Gaussian process regression (GPR) to model the measured water properties across the territory, considering not only the spatial but inter-parameter correlations. GPR is enhanced with a Spectral Mixture Kernel to facilitate a hyper-parameter selection and optimization. We use a 5-fold cross-validation scheme along with $$R^2$$ R 2 -score to validate the results and select the best model for simultaneous prediction of water properties across the area. Finally, we develop a novel Probabilistic Substance Quality Index (PSQI) that combines probabilistic model predictions with the regulatory standards on the example of the epidemiological rules and hygienic regulations established in Russia. Moreover, we provide an interactive map of experimental results at 100 m2 resolution. The proposed approach contributes significantly to the development of flexible tools in environment quality monitoring, being scalable to different standard systems, number of observation points, and region of interest. It has a strong potential for adaption to environmental and policy changes and non-unified assessment conditions, and may be integrated into support-decision systems for the rapid estimation of water quality spatial distribution.

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“…Along the groundwater flow direction, the hydrochemistry is always affected by mineral weathering over a long residence time [42]. However, from the recharge area to the discharge area along the flow path, decreasing tritium values and increasing concentrations of chloride ions and electric conductivity are expected due to exchange reactions, precipitations, solubility and mixing water, although real data may vary [43,44]. The saturation index (SI) of a mineral can be estimated by the following equation:…”

Section: Saturation Index and Mineral Dissolutionmentioning

confidence: 99%

Groundwater Hydrochemical and Isotopic Evolution from High Atlas Jurassic Limestones to Errachidia Cretaceous Basin (Southeastern Morocco)

Roubil

Ouali

Bülbül

et al. 2022

Water

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The objective of this research was to determine the recharge of the Cretaceous aquifers by the High Atlas, as well as the interaction and possible mixing phenomena between the waters of the different aquifers, by investigating the hydrochemical and isotopic evolution of groundwater flow paths from the limestone karst systems of the High Atlas to the Cretaceous basin of Errachidia. Geological techniques were used to investigate and confirm the chemical and isotopic characteristics of the waters. Although the Gibbs diagram shows that water–rock interaction is the dominant hydrochemical process, some water samples in the Cretaceous basin are influenced by both evaporation and water–rock interaction, indicating a mixture of rainfall and deep waters. A saturation index study indicated that limestone minerals were supersaturated in parts of the groundwater samples (calcite and dolomite). This result was confirmed by isotope data. Indeed, some Cretaceous basin samples show isotopic similarities to those from the Jurassic High Atlas. The geological cross-sections illustrate that the High Atlas Jurassic limestones are in direct contact with the Cretaceous basin’s permeable rocks, allowing groundwater to circulate from the High Atlas to Errachidia’s Cretaceous basin.

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Hydrogeochemistry Fundamentals and Advances

Cited by 10 publications

References 0 publications

Geothermal flux and phreatic speleogenesis in gypsum, halite, and quartzite rocks

Geothermal flux and phreatic speleogenesis in gypsum, halite, and quartzite rocks

Regulation-based probabilistic substance quality index and automated geo-spatial modeling for water quality assessment

Groundwater Hydrochemical and Isotopic Evolution from High Atlas Jurassic Limestones to Errachidia Cretaceous Basin (Southeastern Morocco)

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