Disturbance of a natural hydrogeochemical system caused by the construction of a high-level radioactive waste facility: The case study of the central storage facility at Villar de Cañas, Spain

Alonso, J.; Moya, Marina; Asensio, Laura; Navarro, Vicente; Gómez, P.

doi:10.1016/j.advwatres.2019.03.020

Cited by 2 publications

(2 citation statements)

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“…The conceptual model was established based on the hydrogeological and hydrogeochemical conditions near the village of Villar de Cañas (Cuenca, Spain) within the Loranca Basin [71][72][73]. The basin contains mainly continental Tertiary deposits folded along with the underlying Mesozoic rocks [74].…”

Section: Conceptual Modelmentioning

confidence: 99%

“…Here, we present a reactive transport model to study gypsum karstification in physically and chemically heterogeneous fractured evaporitic media and evaluate the long-term (1000 years) evolution of gypsum karstification. The models are based on the hydrogeological and hydrogeochemical conditions prevailing near Villar de Cañas in central Spain, where a site was investigated for its suitability for hosting an interim surface facility for high-level radioactive waste [71,72]. Numerical models account for the changes in porosity caused by mineral dissolution/precipitation and the associated effects on the flow, transport, and chemical parameters of the fractured medium.…”

Section: Introductionmentioning

confidence: 99%

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Reactive Transport Model of Gypsum Karstification in Physically and Chemically Heterogeneous Fractured Media

et al. 2022

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Gypsum dissolution leads to the development of karstic features within much shorter timescales than in other sedimentary rocks, potentially leading to rapid deterioration of groundwater quality and increasing the risk of catastrophes caused by subsidence. Here, we present a 2-D reactive transport model to evaluate gypsum karstification in physically and chemically heterogeneous systems. The model considers a low-permeability rock matrix composed mainly of gypsum and a discontinuity (fracture), which acts as a preferential water pathway. Several scenarios are analyzed and simulated to investigate the relevance for gypsum karstification of: (1) the dynamic update of flow and transport parameters due to porosity changes; (2) the spatial distribution of minerals in the rock matrix; (3) the time evolution of water inflows through the boundaries of the model; (4) the functions relating permeability, k, to porosity, ϕ. The average porosity of the matrix after 1000 years of simulation increases from 0.045 to 0.29 when flow, transport, and chemical parameters and the water inflows through the boundary are dynamically updated according to the porosity changes. On the contrary, the porosity of the matrix hardly changes when the porosity feedback effect is not considered, while its average increases to 0.13 if the water inflow occurs through the discontinuity. Moreover, the dissolution of small amounts of highly soluble sulfate minerals plays a major role in the development of additional fractures. The increase in hydraulic conductivity is largest for the power law with an exponent of n = 5, as well as the Kozeny-Carman and the modified Fair-atch k-ϕ relationships. The gypsum dissolution front propagates into the matrix faster when the power law with n = 2 and 3 and the Verma–Pruess k-ϕ relationships are used.

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