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UPC: C/ Jordi Girona 31, (08034 - Barcelona) - IDAEA: C/ Jordi Girona 18-26, (08034 - Barcelona)

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Towards quantification of mixing-relevant quantities from geophysics

SEMINARIO GRUPO DE HIDROLOGIA SUBTERRÁNEA

UPC-CSIC

Towards quantification of mixing-relevant quantities from geophysics


Niklas Linde (University of Lausanne)

Día: 15 de Junio a las 12.15 h
Lugar: Aula CIHS. Departamento de Ing. Terreno


Abstract:
Geophysics provides non-invasive field-scale imaging of spatially- and temporally-variable upscaled physical properties. Among those, electrical conductivity is closely linked to salinity. Because of non-linear averaging, these upscaled properties are oftentimes unrepresentative of (arithmetic) mean properties. Sub-resolution effects (impacts of property distributions below the resolution of geophysical tomograms) are seldom accounted for when using geophysics to infer hydrogeologically relevant information. In this talk, I will first illustrate sub-resolution effect with an example of fracture-aperture estimation using ground penetrating radar data. I will then present two
laboratory-scale examples that use electrical resistivity measurements to monitor tracer test experiments: one concerns the effect of two distinct fluid conductivities with application to dual-domain mass transfer, the other concerns the effect of small-scale salinity fluctuations below the averaging scale of the measurements. We hypothesise that sub-resolution effects carry information that is relevant to characterise mixing of solutes in groundwater systems, with implications for the characterisation of saline intrusion processes and interpretations of tracer tests using geophysics.

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