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  • Data-driven modeling for groundwater exploration in fractured crystalline terrain, northeast Brazil

    Author(s)
    Friedel, Michael James
    de Souza Filho, Oderson Antônio
    Iwashita, Fabio
    Silva, Adalene Moreira
    Yoshinaga, Sueli
    Griffith University Author(s)
    Iwashita, Fabio
    Year published
    2012
    Metadata
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    Abstract
    It is not possible, using numerical methods, to model groundwater flow and transport in the fractured crystalline rock of northeastern Brazil. As an alternative, the usefulness of self-organizing map (SOM), k-means clustering, and Davies-Bouldin techniques to conceptualize the hydrogeology was evaluated. Also estimated was the well yield and groundwater quality across the Juᠲegion. This process relies on relations in the underlying multivariate density function associated with a sparse local set of hydrogeologic (electrical conductivity, geology, temperature, and well yield) and a complete regional set of airborne geophysical ...
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    It is not possible, using numerical methods, to model groundwater flow and transport in the fractured crystalline rock of northeastern Brazil. As an alternative, the usefulness of self-organizing map (SOM), k-means clustering, and Davies-Bouldin techniques to conceptualize the hydrogeology was evaluated. Also estimated was the well yield and groundwater quality across the Juᠲegion. This process relies on relations in the underlying multivariate density function associated with a sparse local set of hydrogeologic (electrical conductivity, geology, temperature, and well yield) and a complete regional set of airborne geophysical (electromagnetic, magnetic, and radiometric) and satellite spectrometric measurements. Resampling of the regional well yield and electrical conductivity estimates provides sufficient resolution to construct variograms for stochastic modeling of the hydrogeologic variables. The combination of these stochastic maps provides a way to identify potential drilling targets for future groundwater development. The data-driven estimation approach, when applied to available airborne electromagnetic and water-well hydrogeologic measurements, provides a low-cost alternative to numerical groundwater flow modeling. In addition to fractured rock environments, the alternative modeling framework can provide spatial parameter estimates and associated variograms for constraints to improve the traditional calibration of equivalent groundwater-porous-media models.
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    Journal Title
    Hydrogeology Journal
    Volume
    20
    Issue
    6
    DOI
    https://doi.org/10.1007/s10040-012-0855-1
    Subject
    Earth Sciences not elsewhere classified
    Earth Sciences
    Engineering
    Publication URI
    http://hdl.handle.net/10072/61627
    Collection
    • Journal articles

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