Modelação baseada em dados para exploração de água subterrânea em terrenos cristalinos fraturados, nordeste do Brasil

Friedel, Michael J.; Filho, Oderson Antônio de Souza; Iwashita, Fabio; Silva, Adalene Moreira; Yoshinaga, Sueli

doi:10.1007/s10040-012-0855-1

Cited by 14 publications

(7 citation statements)

References 33 publications

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“…Ground techniques are compatible with airborne conditions allowing for much larger (100s m to 1000s m) regional hydrostructural investigations related to aquifer thickness, aquifer heterogeneity, water table/water quality mapping, and large‐scale structural lineaments [ Andersen et al ., ; Brunner et al ., ; Friedel et al ., ; Gondwe et al ., ; Mabey , ; Okazaki et al ., ; Rasmussen et al ., ; Robinson et al ., ; Siemon et al ., ]. Brunner et al .…”

Section: Introductionmentioning

confidence: 99%

Coupling ground and airborne geophysical data with upscaling techniques for regional groundwater modeling of heterogeneous aquifers: Case study of a sedimentary aquifer intruded by volcanic dykes in Northern Ireland

Dickson

Comte

McKinley

et al. 2014

Water Resources Research

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In highly heterogeneous aquifer systems, conceptualization of regional groundwater flow models frequently results in the generalization or negligence of aquifer heterogeneities, both of which may result in erroneous model outputs. The calculation of equivalence related to hydrogeological parameters and applied to upscaling provides a means of accounting for measurement scale information but at regional scale. In this study, the Permo-Triassic Lagan Valley strategic aquifer in Northern Ireland is observed to be heterogeneous, if not discontinuous, due to subvertical trending low-permeability Tertiary dolerite dykes. Interpretation of ground and aerial magnetic surveys produces a deterministic solution to dyke locations. By measuring relative permeabilities of both the dykes and the sedimentary host rock, equivalent directional permeabilities, that determine anisotropy calculated as a function of dyke density, are obtained. This provides parameters for larger scale equivalent blocks, which can be directly imported to numerical groundwater flow models. Different conceptual models with different degrees of upscaling are numerically tested and results compared to regional flow observations. Simulation results show that the upscaled permeabilities from geophysical data allow one to properly account for the observed spatial variations of groundwater flow, without requiring artificial distribution of aquifer properties. It is also found that an intermediate degree of upscaling, between accounting for mapped field-scale dykes and accounting for one regional anisotropy value (maximum upscaling) provides results the closest to the observations at the regional scale.

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Section: Introductionmentioning

confidence: 99%

Coupling ground and airborne geophysical data with upscaling techniques for regional groundwater modeling of heterogeneous aquifers: Case study of a sedimentary aquifer intruded by volcanic dykes in Northern Ireland

Dickson

Comte

McKinley

et al. 2014

Water Resources Research

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“…field scale) can provide quantitative data regarding the properties of heterogeneities observed from a regional perspective. In the example of the Lagan Valley aquifer, it was found that heterogeneity observed from regional AMag data was the result of a cluster of several smaller fieldscale dykes (each containing fractures of varying widths) whose magnetic signature was becoming merged (Burns et al 2010;Fay et al 2010;Dickson et al 2014). Therefore, at the regional scale, heterogeneities were defined with equivalent hydraulic conductivities K and anisotropy properties (K).…”

Section: Previous Hydrogeological Model Of the Lagan Valley Aquifermentioning

confidence: 99%

Integrating aerial geophysical data in multiple-point statistics simulations to assist groundwater flow models

et al. 2015

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The process of accounting for heterogeneity has made significant advances in statistical research, primarily in the framework of stochastic analysis and the development of multiple-point statistics (MPS). Among MPS techniques, the direct sampling (DS) method is tested to determine its ability to delineate heterogeneity from aerial magnetics data in a regional sandstone aquifer intruded by low-permeability volcanic dykes in Northern Ireland, UK. The use of two two-dimensional bivariate training images aids in creating spatial probability distributions of heterogeneities of hydrogeological interest, despite relatively 'noisy' magnetics data (i.e. including hydrogeologically irrelevant urban noise and regional geologic effects). These distributions are incorporated into a hierarchy system where previously published density function and upscaling methods are applied to derive regional distributions of equivalent hydraulic conductivity tensor K. Several K models, as determined by several stochastic realisations of MPS dyke locations, are computed within groundwater flow models and evaluated by comparing modelled heads with field observations. Results show a significant improvement in model calibration when compared to a simplistic homogeneous and isotropic aquifer model that does not account for the dyke occurrence evidenced by airborne magnetic data. The best model is obtained when normal and reverse polarity dykes are computed separately within MPS simulations and when a probability threshold of 0.7 is applied. The presented stochastic approach also provides improvement when compared to a previously published deterministic anisotropic model based on the unprocessed (i.e. noisy) airborne magnetics. This demonstrates the potential of coupling MPS to airborne geophysical data for regional groundwater modelling.

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“…The SOM approach is, therefore, suited for the analysis of often complex and disparate geoscientific data (Fraser and Dickson 2007). The potential of the technique for hydrologic system analysis has been reviewed and concluded upon by Kalteh et al (2008), with recent examples including, e.g., investigations of heavy rainfall patterns (Nishiyama et al 2007) and groundwater exploration (Friedel et al 2012).…”

Section: Self-organizing Mapsmentioning

confidence: 99%

On the scope and management of pesticide pollution of Swedish groundwater resources: The Scanian example

Åkesson

Sparrenbom

Dahlqvist

et al. 2014

AMBIO

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Twenty-three south-Swedish public supply wells were studied to assess pesticide pollution of regional groundwater resources. Relations between pesticide occurrence, hydrogeology, and land use were analyzed using Kohonen's Self-Organizing Maps approach. Pesticides are demonstrated to be substantially present in regional groundwater, with detections in 18 wells. Concentrations above the drinking water threshold are confirmed for nine wells. Observations indicate considerable urban influence, and lagged effects of past, less restricted use. Modern, oxic waters from shallow, unconfined, unconsolidated or fracture-type bedrock aquifers appear particularly vulnerable. Least affected waters appear primarily associated with deeper wells, anoxic conditions, and more confined sediment aquifers lacking urban influence. Comprehensive, standardized monitoring of pesticides in groundwater need to be implemented nationwide to enable sound assessments of pollution status and trends, and to develop sound groundwater management plans in accordance with the Water Framework Directive. Further, existing water protection areas and associated regulations need to be reassessed.

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Modelação baseada em dados para exploração de água subterrânea em terrenos cristalinos fraturados, nordeste do Brasil

Cited by 14 publications

References 33 publications

Coupling ground and airborne geophysical data with upscaling techniques for regional groundwater modeling of heterogeneous aquifers: Case study of a sedimentary aquifer intruded by volcanic dykes in Northern Ireland

Coupling ground and airborne geophysical data with upscaling techniques for regional groundwater modeling of heterogeneous aquifers: Case study of a sedimentary aquifer intruded by volcanic dykes in Northern Ireland

Integrating aerial geophysical data in multiple-point statistics simulations to assist groundwater flow models

On the scope and management of pesticide pollution of Swedish groundwater resources: The Scanian example

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